<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.kratosdefense.com/role/Acquisition" xlink:href="ktos-20190929.xsd#Acquisition" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/AcquisitionAssetsAcquiredAndLiabilitiesAssumedDetails" xlink:href="ktos-20190929.xsd#AcquisitionAssetsAcquiredAndLiabilitiesAssumedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/AcquisitionConsiderationPaidDetails" xlink:href="ktos-20190929.xsd#AcquisitionConsiderationPaidDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/AcquisitionNarrativeDetails" xlink:href="ktos-20190929.xsd#AcquisitionNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/AcquisitionProFormaFinancialInformationDetails" xlink:href="ktos-20190929.xsd#AcquisitionProFormaFinancialInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/AcquisitionTables" xlink:href="ktos-20190929.xsd#AcquisitionTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/CommitmentsAndContingencies" xlink:href="ktos-20190929.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/CondensedConsolidatedBalanceSheets" xlink:href="ktos-20190929.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="ktos-20190929.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="ktos-20190929.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncomeLoss" xlink:href="ktos-20190929.xsd#CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncomeLoss" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/CondensedConsolidatedStatementsOfStockholdersEquity" xlink:href="ktos-20190929.xsd#CondensedConsolidatedStatementsOfStockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/CoverPage" xlink:href="ktos-20190929.xsd#CoverPage" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/Debt" xlink:href="ktos-20190929.xsd#Debt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/DebtCreditAndSecurityAgreementDetails" xlink:href="ktos-20190929.xsd#DebtCreditAndSecurityAgreementDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/DebtFairValueOfLongTermDebtDetails" xlink:href="ktos-20190929.xsd#DebtFairValueOfLongTermDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/DebtIssuanceOf65SeniorSecuredNotesDue2025Details" xlink:href="ktos-20190929.xsd#DebtIssuanceOf65SeniorSecuredNotesDue2025Details" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/DebtTables" xlink:href="ktos-20190929.xsd#DebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/DiscontinuedOperations" xlink:href="ktos-20190929.xsd#DiscontinuedOperations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/DiscontinuedOperationsAdditionalInformationDetails" xlink:href="ktos-20190929.xsd#DiscontinuedOperationsAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/DiscontinuedOperationsAssetsAndLiabilitiesDetails" xlink:href="ktos-20190929.xsd#DiscontinuedOperationsAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/DiscontinuedOperationsResultsOfDiscontinuedOperationsDetails" xlink:href="ktos-20190929.xsd#DiscontinuedOperationsResultsOfDiscontinuedOperationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/DiscontinuedOperationsTables" xlink:href="ktos-20190929.xsd#DiscontinuedOperationsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/GoodwillAndIntangibleAssets" xlink:href="ktos-20190929.xsd#GoodwillAndIntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/GoodwillAndIntangibleAssetsGoodwillDetails" xlink:href="ktos-20190929.xsd#GoodwillAndIntangibleAssetsGoodwillDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/GoodwillAndIntangibleAssetsPurchasedIntangibleAssetsDetails" xlink:href="ktos-20190929.xsd#GoodwillAndIntangibleAssetsPurchasedIntangibleAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/GoodwillAndIntangibleAssetsTables" xlink:href="ktos-20190929.xsd#GoodwillAndIntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/IncomeTaxes" xlink:href="ktos-20190929.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/IncomeTaxesAdditionalInformationDetails" xlink:href="ktos-20190929.xsd#IncomeTaxesAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/IncomeTaxesIncomeTaxProvisionReconciliationDetails" xlink:href="ktos-20190929.xsd#IncomeTaxesIncomeTaxProvisionReconciliationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/IncomeTaxesTables" xlink:href="ktos-20190929.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/InventoriedCosts" xlink:href="ktos-20190929.xsd#InventoriedCosts" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/InventoriedCostsDetails" xlink:href="ktos-20190929.xsd#InventoriedCostsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/InventoriedCostsTables" xlink:href="ktos-20190929.xsd#InventoriedCostsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/Leases" xlink:href="ktos-20190929.xsd#Leases" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/LeasesAdditionalInformationDetails" xlink:href="ktos-20190929.xsd#LeasesAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/LeasesCashPaidDetails" xlink:href="ktos-20190929.xsd#LeasesCashPaidDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/LeasesLeaseExpenseDetails" xlink:href="ktos-20190929.xsd#LeasesLeaseExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/LeasesMaturitiesOfOperatingAndFinancingLeaseLiabilitiesDetails" xlink:href="ktos-20190929.xsd#LeasesMaturitiesOfOperatingAndFinancingLeaseLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/LeasesMaturitiesOfOperatingAndFinancingLeaseLiabilitiesDetailsCalc2" xlink:href="ktos-20190929.xsd#LeasesMaturitiesOfOperatingAndFinancingLeaseLiabilitiesDetailsCalc2" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/LeasesOperatingLeaseUnderAsc840Details" xlink:href="ktos-20190929.xsd#LeasesOperatingLeaseUnderAsc840Details" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/LeasesSupplementalBalanceSheetDetails" xlink:href="ktos-20190929.xsd#LeasesSupplementalBalanceSheetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/LeasesTables" xlink:href="ktos-20190929.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/LeasesWeightedAverageDetails" xlink:href="ktos-20190929.xsd#LeasesWeightedAverageDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/NetIncomeLossPerCommonShare" xlink:href="ktos-20190929.xsd#NetIncomeLossPerCommonShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/NetIncomeLossPerCommonShareDetails" xlink:href="ktos-20190929.xsd#NetIncomeLossPerCommonShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/RedeemableNoncontrollingInterest" xlink:href="ktos-20190929.xsd#RedeemableNoncontrollingInterest" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/RedeemableNoncontrollingInterestDetails" xlink:href="ktos-20190929.xsd#RedeemableNoncontrollingInterestDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/RevenueRecognition" xlink:href="ktos-20190929.xsd#RevenueRecognition" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/RevenueRecognitionContractAssetsAndLiabilitiesDetails" xlink:href="ktos-20190929.xsd#RevenueRecognitionContractAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/RevenueRecognitionDisaggregationOfRevenueDetails" xlink:href="ktos-20190929.xsd#RevenueRecognitionDisaggregationOfRevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/RevenueRecognitionNarrativeDetails" xlink:href="ktos-20190929.xsd#RevenueRecognitionNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails" xlink:href="ktos-20190929.xsd#RevenueRecognitionRemainingPerformanceObligationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/RevenueRecognitionTables" xlink:href="ktos-20190929.xsd#RevenueRecognitionTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/SegmentInformation" xlink:href="ktos-20190929.xsd#SegmentInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/SegmentInformationAdditionalInformationDetails" xlink:href="ktos-20190929.xsd#SegmentInformationAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/SegmentInformationScheduleOfSegmentRevenuesDepreciationAndAmortizationAndOperatingLossDetails" xlink:href="ktos-20190929.xsd#SegmentInformationScheduleOfSegmentRevenuesDepreciationAndAmortizationAndOperatingLossDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/SegmentInformationTables" xlink:href="ktos-20190929.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/SignificantCustomers" xlink:href="ktos-20190929.xsd#SignificantCustomers" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/SignificantCustomersDetails" xlink:href="ktos-20190929.xsd#SignificantCustomersDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/SummaryOfSignificantAccountingPolicies" xlink:href="ktos-20190929.xsd#SummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:href="ktos-20190929.xsd#SummaryOfSignificantAccountingPoliciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.kratosdefense.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:href="ktos-20190929.xsd#SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/Acquisition" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/AcquisitionAssetsAcquiredAndLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest_03ADE188DD10596D9FA9BAD972E76BD5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_D629876985B458179953BD551DF631B9" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest_03ADE188DD10596D9FA9BAD972E76BD5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_D629876985B458179953BD551DF631B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4FAC264B54C6555BAE024A2FCC0EB97F" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_D629876985B458179953BD551DF631B9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4FAC264B54C6555BAE024A2FCC0EB97F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_B167DC2B62C15FADA11F8CEC6EA22418" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4FAC264B54C6555BAE024A2FCC0EB97F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_B167DC2B62C15FADA11F8CEC6EA22418" xlink:type="arc" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsUnbilledReceivables" xlink:label="loc_ktos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsUnbilledReceivables_46E62A9EF2695DC6A2A8EABEEDF58CBE" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4FAC264B54C6555BAE024A2FCC0EB97F" xlink:to="loc_ktos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsUnbilledReceivables_46E62A9EF2695DC6A2A8EABEEDF58CBE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_D1A3586D97675BA5B380C0C56B86FD82" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4FAC264B54C6555BAE024A2FCC0EB97F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_D1A3586D97675BA5B380C0C56B86FD82" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_9937058BE7F95BD3BC7F9A5B2E3DFCBF" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4FAC264B54C6555BAE024A2FCC0EB97F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_9937058BE7F95BD3BC7F9A5B2E3DFCBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_BA1BE9ABAD5651FCB4F6F9ABB7D1BC66" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4FAC264B54C6555BAE024A2FCC0EB97F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_BA1BE9ABAD5651FCB4F6F9ABB7D1BC66" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_C1CED5FB6C315BCB8BAD058F932BE7C1" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4FAC264B54C6555BAE024A2FCC0EB97F" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_C1CED5FB6C315BCB8BAD058F932BE7C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_DF91CAA73CE1588FB019220827143E26" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4FAC264B54C6555BAE024A2FCC0EB97F" xlink:to="loc_us-gaap_Goodwill_DF91CAA73CE1588FB019220827143E26" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_CF79601C0D075565A38660BDA65C0399" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_D629876985B458179953BD551DF631B9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_CF79601C0D075565A38660BDA65C0399" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_02689210E76051B6868B13D85D42765D" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest_03ADE188DD10596D9FA9BAD972E76BD5" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue_02689210E76051B6868B13D85D42765D" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/AcquisitionConsiderationPaidDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_E1AFD5EF8F6C5AE59C89DA96467B6B03" xlink:type="locator" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_BusinessCombinationConsiderationTransferredGross" xlink:label="loc_ktos_BusinessCombinationConsiderationTransferredGross_906D286E6AF559589C18672FB9B91F8F" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferred1_E1AFD5EF8F6C5AE59C89DA96467B6B03" xlink:to="loc_ktos_BusinessCombinationConsiderationTransferredGross_906D286E6AF559589C18672FB9B91F8F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_D7A7281BF5FC5710BA8A49AEA0701E0C" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ktos_BusinessCombinationConsiderationTransferredGross_906D286E6AF559589C18672FB9B91F8F" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_D7A7281BF5FC5710BA8A49AEA0701E0C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_7089C15D89F555A6B3B3BB891B5C49A3" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ktos_BusinessCombinationConsiderationTransferredGross_906D286E6AF559589C18672FB9B91F8F" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_7089C15D89F555A6B3B3BB891B5C49A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_7958010E34F75F15B7DFE55849887149" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ktos_BusinessCombinationConsiderationTransferredGross_906D286E6AF559589C18672FB9B91F8F" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_7958010E34F75F15B7DFE55849887149" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAcquiredFromAcquisition" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_E25AC23EF43D5A55B6AB5B52E479087D" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferred1_E1AFD5EF8F6C5AE59C89DA96467B6B03" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_E25AC23EF43D5A55B6AB5B52E479087D" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/AcquisitionNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/AcquisitionProFormaFinancialInformationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/AcquisitionTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_d7f1ad03-6ed4-706a-15fc-eae794dee33a" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_d7f1ad03-6ed4-706a-15fc-eae794dee33a" xlink:to="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:to="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_9c889623-7b4f-c89a-bbb3-2bc9fb9ad9f5" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_AccountsPayableCurrent_9c889623-7b4f-c89a-bbb3-2bc9fb9ad9f5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_c90cf113-b51b-4312-22d0-4adb9883d309" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_c90cf113-b51b-4312-22d0-4adb9883d309" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_a2b836a7-cc87-0e4f-38a0-c91a29535622" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_a2b836a7-cc87-0e4f-38a0-c91a29535622" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestPayableCurrent" xlink:label="loc_us-gaap_InterestPayableCurrent_44d274ec-089d-7b00-4cf5-06d0b5a846fb" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_InterestPayableCurrent_44d274ec-089d-7b00-4cf5-06d0b5a846fb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BillingsInExcessOfCost" xlink:label="loc_us-gaap_BillingsInExcessOfCost_d53420ec-ae11-0121-04b9-9168f265c1be" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_BillingsInExcessOfCost_d53420ec-ae11-0121-04b9-9168f265c1be" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_b91d2f01-85c2-f9fb-3250-26a4b1b39c5e" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_b91d2f01-85c2-f9fb-3250-26a4b1b39c5e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_ebb4c1f8-b5df-aab0-ee90-1e91fd21cf92" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_ebb4c1f8-b5df-aab0-ee90-1e91fd21cf92" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_67f01114-c4ea-0168-3eea-619282e0423c" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_30dca50d-a7bd-cff0-949a-3d7ae869c50d" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_67f01114-c4ea-0168-3eea-619282e0423c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_aa2e73c1-d03e-7f76-3502-7a650f99607c" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_aa2e73c1-d03e-7f76-3502-7a650f99607c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_d18f979c-644d-9e92-9e89-21cfd1312948" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_d18f979c-644d-9e92-9e89-21cfd1312948" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_1a135c88-c424-f9c2-9674-af6f11a9bcef" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_44863786-cbc4-bac4-e070-0a1f19314584" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent_1a135c88-c424-f9c2-9674-af6f11a9bcef" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_d7f1ad03-6ed4-706a-15fc-eae794dee33a" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_us-gaap_PreferredStockValue_928e20af-e738-4a2d-05b8-cf88fed11953" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:to="loc_us-gaap_PreferredStockValue_928e20af-e738-4a2d-05b8-cf88fed11953" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_f05ab245-2bd1-7865-e7ed-1461a5a6155f" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:to="loc_us-gaap_CommonStockValue_f05ab245-2bd1-7865-e7ed-1461a5a6155f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_9a00ddef-ccc2-f99c-735a-66b1e1849bbf" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_9a00ddef-ccc2-f99c-735a-66b1e1849bbf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_988c1346-b444-a867-fe80-f3aec1443d54" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_988c1346-b444-a867-fe80-f3aec1443d54" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_62305d8f-d807-0fe8-d0ab-f2c2b3d03011" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2605fa18-bbd8-c7d7-35fc-aace43a8c019" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_62305d8f-d807-0fe8-d0ab-f2c2b3d03011" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingencies" xlink:label="loc_us-gaap_CommitmentsAndContingencies_4d934b0d-59bc-ae5c-ffb9-b6ced82ff9f8" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_d7f1ad03-6ed4-706a-15fc-eae794dee33a" xlink:to="loc_us-gaap_CommitmentsAndContingencies_4d934b0d-59bc-ae5c-ffb9-b6ced82ff9f8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount" xlink:label="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_d53b26b3-bd63-79af-32c0-25c46ebfe237" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_d7f1ad03-6ed4-706a-15fc-eae794dee33a" xlink:to="loc_us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount_d53b26b3-bd63-79af-32c0-25c46ebfe237" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:to="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1de780cc-9607-daa3-0bed-03c88ae94769" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1de780cc-9607-daa3-0bed-03c88ae94769" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_45648fab-0e11-aa1d-aae9-478fdf0d30d7" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue_45648fab-0e11-aa1d-aae9-478fdf0d30d7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_dd2cbe99-77d2-db20-3c91-750589881c79" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_dd2cbe99-77d2-db20-3c91-750589881c79" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_UnbilledReceivablesCurrent" xlink:label="loc_us-gaap_UnbilledReceivablesCurrent_8420db10-015f-e406-d4fc-e9e5045e3970" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_UnbilledReceivablesCurrent_8420db10-015f-e406-d4fc-e9e5045e3970" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings" xlink:label="loc_us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings_0a701ce4-e674-215d-f9dd-4602657c41cb" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings_0a701ce4-e674-215d-f9dd-4602657c41cb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseCurrent" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_f68f267d-78ad-b62f-6b0e-44daadd4feda" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_f68f267d-78ad-b62f-6b0e-44daadd4feda" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_7832082e-fa39-48cc-a655-249c101debf9" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_OtherAssetsCurrent_7832082e-fa39-48cc-a655-249c101debf9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_62bb35f3-f63d-e559-6d31-a62336122a76" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_0b3bd361-d592-2906-279e-2682647fdd27" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_62bb35f3-f63d-e559-6d31-a62336122a76" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_4246ec24-1a4c-19dd-57c9-32d4a8e0cbaa" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_4246ec24-1a4c-19dd-57c9-32d4a8e0cbaa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_dcf3df0d-2155-35f6-715d-83a9bc9cf3fb" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_dcf3df0d-2155-35f6-715d-83a9bc9cf3fb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_37b440e2-656c-b624-0688-b7cf681bf981" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:to="loc_us-gaap_Goodwill_37b440e2-656c-b624-0688-b7cf681bf981" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8889606b-88fa-2d5e-3fb9-238bccdf9597" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8889606b-88fa-2d5e-3fb9-238bccdf9597" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_bd8545de-cfc2-6f31-bff6-ed0d4012c357" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_17ef3f41-42f7-52c0-cba1-93e7e0e1116a" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_bd8545de-cfc2-6f31-bff6-ed0d4012c357" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInContinuingOperations_144837e8-4b64-1347-b7cc-4e35975bbafe" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" xlink:to="loc_us-gaap_NetCashProvidedByUsedInContinuingOperations_144837e8-4b64-1347-b7cc-4e35975bbafe" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInContinuingOperations_144837e8-4b64-1347-b7cc-4e35975bbafe" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_09b7b41a-f5a1-c45e-d61b-846fff462802" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_09b7b41a-f5a1-c45e-d61b-846fff462802" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerAsset" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerAsset_591bbf45-d531-0671-adc1-cfca3447af6c" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerAsset_591bbf45-d531-0671-adc1-cfca3447af6c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_f2b34f8d-2445-12ee-2c68-fa0c5409d5e0" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_f2b34f8d-2445-12ee-2c68-fa0c5409d5e0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_dfcbd6f7-83fa-00c2-bd9e-6c5c1de7d890" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_dfcbd6f7-83fa-00c2-bd9e-6c5c1de7d890" xlink:type="arc" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_IncreaseDecreaseInOperatingLeaseLiabilities" xlink:label="loc_ktos_IncreaseDecreaseInOperatingLeaseLiabilities_ad2c5b5e-f227-3585-29a2-d8c041aa96ce" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_ktos_IncreaseDecreaseInOperatingLeaseLiabilities_ad2c5b5e-f227-3585-29a2-d8c041aa96ce" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_792166b2-b561-55ef-12fd-ca8b50f64a38" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_792166b2-b561-55ef-12fd-ca8b50f64a38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherAccruedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherAccruedLiabilities_39e086ce-b837-ec97-eac8-f7ac190f32e2" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherAccruedLiabilities_39e086ce-b837-ec97-eac8-f7ac190f32e2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_300c5b66-f508-fab7-3859-345853a2ad7c" xlink:type="locator" />
    <link:calculationArc order="8" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_300c5b66-f508-fab7-3859-345853a2ad7c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInCustomerAdvances" xlink:label="loc_us-gaap_IncreaseDecreaseInCustomerAdvances_461b3dcf-dbd7-222e-f356-ecf179fc7879" xlink:type="locator" />
    <link:calculationArc order="9" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInCustomerAdvances_461b3dcf-dbd7-222e-f356-ecf179fc7879" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInInterestPayableNet" xlink:label="loc_us-gaap_IncreaseDecreaseInInterestPayableNet_d1e597c7-a8a1-e058-f332-7cdc07a8ef8e" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInInterestPayableNet_d1e597c7-a8a1-e058-f332-7cdc07a8ef8e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_8fa19589-0da6-036d-a79e-4bd2fa365a6d" xlink:type="locator" />
    <link:calculationArc order="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_8fa19589-0da6-036d-a79e-4bd2fa365a6d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_04a19824-751b-472f-ae2c-9a8e73a625b4" xlink:type="locator" />
    <link:calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable_04a19824-751b-472f-ae2c-9a8e73a625b4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_d7de2883-fea4-6e7c-2c8b-7fee9aa34369" xlink:type="locator" />
    <link:calculationArc order="13" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_d7de2883-fea4-6e7c-2c8b-7fee9aa34369" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_5ae19a9f-6de6-075a-2c5a-a587d82ebad5" xlink:type="locator" />
    <link:calculationArc order="14" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_5ae19a9f-6de6-075a-2c5a-a587d82ebad5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfDeferredCharges" xlink:label="loc_us-gaap_AmortizationOfDeferredCharges_0fd292c9-046a-7e5b-d24c-b0d955ae77d5" xlink:type="locator" />
    <link:calculationArc order="15" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_AmortizationOfDeferredCharges_0fd292c9-046a-7e5b-d24c-b0d955ae77d5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_3421bed6-296e-da4e-f0e9-a2a8fa1f6d19" xlink:type="locator" />
    <link:calculationArc order="16" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_3421bed6-296e-da4e-f0e9-a2a8fa1f6d19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_us-gaap_ShareBasedCompensation_f0b9d825-b0b9-37fd-4d25-9294a8598890" xlink:type="locator" />
    <link:calculationArc order="17" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_ShareBasedCompensation_f0b9d825-b0b9-37fd-4d25-9294a8598890" xlink:type="arc" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_OperatingAndFinanceLeaseRightofUseAssetAmortization" xlink:label="loc_ktos_OperatingAndFinanceLeaseRightofUseAssetAmortization_f33528a6-eec6-7bb0-c7e1-d8c041cb6872" xlink:type="locator" />
    <link:calculationArc order="18" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_ktos_OperatingAndFinanceLeaseRightofUseAssetAmortization_f33528a6-eec6-7bb0-c7e1-d8c041cb6872" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_ebef248a-da21-637d-9d28-3d42ff90e8e2" xlink:type="locator" />
    <link:calculationArc order="19" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_ebef248a-da21-637d-9d28-3d42ff90e8e2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_1f42c682-c9cf-1de0-1230-a353dc469675" xlink:type="locator" />
    <link:calculationArc order="20" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_dce89b76-d03f-c578-1259-1af05326f597" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_1f42c682-c9cf-1de0-1230-a353dc469675" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInContinuingOperations_144837e8-4b64-1347-b7cc-4e35975bbafe" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_6abb14d9-7978-302d-af6b-dbfc88f76bf2" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_6abb14d9-7978-302d-af6b-dbfc88f76bf2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireProductiveAssets" xlink:label="loc_us-gaap_PaymentsToAcquireProductiveAssets_a73d82d7-3d54-5ea8-2d2f-c40454b71639" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:to="loc_us-gaap_PaymentsToAcquireProductiveAssets_a73d82d7-3d54-5ea8-2d2f-c40454b71639" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleOfOtherAssetsInvestingActivities" xlink:label="loc_us-gaap_ProceedsFromSaleOfOtherAssetsInvestingActivities_bbd6beb3-c1e3-2891-b860-02c6b5ed4d80" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_0f07a806-a2da-6d18-a7a9-d734fad1f3b0" xlink:to="loc_us-gaap_ProceedsFromSaleOfOtherAssetsInvestingActivities_bbd6beb3-c1e3-2891-b860-02c6b5ed4d80" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInContinuingOperations_144837e8-4b64-1347-b7cc-4e35975bbafe" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDebtIssuanceCosts" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_d03b640f-8d2c-4108-a1c4-1354103a7ee2" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_d03b640f-8d2c-4108-a1c4-1354103a7ee2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_0f0975d6-8500-76a0-c74f-5d2f0ed8b620" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_0f0975d6-8500-76a0-c74f-5d2f0ed8b620" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_cb96fc07-e276-2c52-1042-f1ea0d192b51" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_cb96fc07-e276-2c52-1042-f1ea0d192b51" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeasePrincipalPayments" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_138d7df8-0ec2-04f9-f9f7-0e5a0ff1d684" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_FinanceLeasePrincipalPayments_138d7df8-0ec2-04f9-f9f7-0e5a0ff1d684" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOrSaleOfEquity" xlink:label="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_556487ea-ca27-5324-e6ac-b9165cb43b17" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_1efd93c0-bb90-2a64-a997-3a70afaa3faa" xlink:to="loc_us-gaap_ProceedsFromIssuanceOrSaleOfEquity_556487ea-ca27-5324-e6ac-b9165cb43b17" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations" xlink:label="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_e29cccf8-6a61-25e9-e8d3-3b5943366ab7" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" xlink:to="loc_us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations_e29cccf8-6a61-25e9-e8d3-3b5943366ab7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_62f6f07e-4449-59c4-74ee-766defbf8a2f" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_62f6f07e-4449-59c4-74ee-766defbf8a2f" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncomeLoss" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDiluted_f0fd2c79-0568-95bb-cad7-34e2c5c0c359" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare_c552a273-1e7d-4c58-20e7-4e9545bfa977" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDiluted_f0fd2c79-0568-95bb-cad7-34e2c5c0c359" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare_c552a273-1e7d-4c58-20e7-4e9545bfa977" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare_1de292e1-e77b-029e-d43c-db5d796bb67b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareBasicAndDiluted_f0fd2c79-0568-95bb-cad7-34e2c5c0c359" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare_1de292e1-e77b-029e-d43c-db5d796bb67b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_a0c542a3-925c-dbca-caae-b45f1a51036d" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_9296eff8-e0bf-16cc-fa86-f1b0968a0982" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareDiluted_a0c542a3-925c-dbca-caae-b45f1a51036d" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_9296eff8-e0bf-16cc-fa86-f1b0968a0982" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_676e5c7d-beab-c0d8-be00-bb5a9211e90b" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_EarningsPerShareDiluted_a0c542a3-925c-dbca-caae-b45f1a51036d" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_676e5c7d-beab-c0d8-be00-bb5a9211e90b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_e170ce1e-c3a8-e8ee-88b0-37e8dd7b1d11" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_e170ce1e-c3a8-e8ee-88b0-37e8dd7b1d11" xlink:to="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_1f42c682-c9cf-1de0-1230-a353dc469675" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_1f42c682-c9cf-1de0-1230-a353dc469675" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_d71649eb-5769-933d-7982-2a2ada9ea257" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_1f42c682-c9cf-1de0-1230-a353dc469675" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_d71649eb-5769-933d-7982-2a2ada9ea257" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_d71649eb-5769-933d-7982-2a2ada9ea257" xlink:to="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_98c25af7-47ba-69a3-12c4-e52bd51b359e" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:to="loc_us-gaap_GrossProfit_98c25af7-47ba-69a3-12c4-e52bd51b359e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_b88c060f-09b3-b6c0-4cdb-a77cb8e75ec8" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_98c25af7-47ba-69a3-12c4-e52bd51b359e" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_b88c060f-09b3-b6c0-4cdb-a77cb8e75ec8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_3549c1c0-2f2a-e44b-026b-b4042153e489" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_GrossProfit_98c25af7-47ba-69a3-12c4-e52bd51b359e" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_3549c1c0-2f2a-e44b-026b-b4042153e489" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_89fcc343-1933-1e77-588e-68d1c2f1a04f" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_89fcc343-1933-1e77-588e-68d1c2f1a04f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_a1db5b73-77b3-883e-5b3a-b422419e43e3" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_a1db5b73-77b3-883e-5b3a-b422419e43e3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_ef2ac9e8-006f-b467-3389-9a8ceec4bee5" xlink:type="locator" />
    <link:calculationArc order="4" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_ef2ac9e8-006f-b467-3389-9a8ceec4bee5" xlink:type="arc" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_ImpairmentChargesAndAdjustmentsToUnusedOfficeSpaceLiability" xlink:label="loc_ktos_ImpairmentChargesAndAdjustmentsToUnusedOfficeSpaceLiability_8de2ae06-baca-4e82-04e9-d8c041ad1c64" xlink:type="locator" />
    <link:calculationArc order="5" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_8db01d6d-ae17-523f-94b9-8ab4add4a22e" xlink:to="loc_ktos_ImpairmentChargesAndAdjustmentsToUnusedOfficeSpaceLiability_8de2ae06-baca-4e82-04e9-d8c041ad1c64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_28fe77ae-e122-e428-d718-aff2ad445bc8" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_d71649eb-5769-933d-7982-2a2ada9ea257" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_28fe77ae-e122-e428-d718-aff2ad445bc8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_2919f63b-33a2-2107-5264-212ca7a03283" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_28fe77ae-e122-e428-d718-aff2ad445bc8" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_2919f63b-33a2-2107-5264-212ca7a03283" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_7a3a9730-2927-590e-4e76-6aeb4157256e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NonoperatingIncomeExpense_28fe77ae-e122-e428-d718-aff2ad445bc8" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_7a3a9730-2927-590e-4e76-6aeb4157256e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_1f42c682-c9cf-1de0-1230-a353dc469675" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_9df24e1e-4f19-c5c7-c707-5fdac881a2b1" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_9df24e1e-4f19-c5c7-c707-5fdac881a2b1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_e6d541e1-f4f4-005e-01e7-1fea8b5b3da6" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_9df24e1e-4f19-c5c7-c707-5fdac881a2b1" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax_e6d541e1-f4f4-005e-01e7-1fea8b5b3da6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_6a929962-55c4-d534-dec1-e59d6078d631" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_9df24e1e-4f19-c5c7-c707-5fdac881a2b1" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_6a929962-55c4-d534-dec1-e59d6078d631" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_a3a6becb-cb5c-3f3c-51b9-6edd8011ed69" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_e170ce1e-c3a8-e8ee-88b0-37e8dd7b1d11" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_a3a6becb-cb5c-3f3c-51b9-6edd8011ed69" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_5c8b3520-1ca2-0a91-0912-70d62831826c" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_c4761fa8-dc2a-e270-4b5c-921deca83ad0" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_5c8b3520-1ca2-0a91-0912-70d62831826c" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_c4761fa8-dc2a-e270-4b5c-921deca83ad0" xlink:type="arc" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_c4761fa8-dc2a-e270-4b5c-921deca83ad0" xlink:to="loc_us-gaap_ProfitLoss_8b582348-a62e-cdfb-bc53-d5894b42e091" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_68a2669c-01f8-c962-bf95-0b4231cd45da" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest_c4761fa8-dc2a-e270-4b5c-921deca83ad0" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_68a2669c-01f8-c962-bf95-0b4231cd45da" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_51cce957-7438-47fa-f5b3-33f2b5e56016" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_5c8b3520-1ca2-0a91-0912-70d62831826c" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest_51cce957-7438-47fa-f5b3-33f2b5e56016" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/CondensedConsolidatedStatementsOfStockholdersEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/CoverPage" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/Debt" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/DebtCreditAndSecurityAgreementDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/DebtFairValueOfLongTermDebtDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/DebtIssuanceOf65SeniorSecuredNotesDue2025Details" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/DebtTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/DiscontinuedOperations" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/DiscontinuedOperationsAdditionalInformationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/DiscontinuedOperationsAssetsAndLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_3B3C4D15E50C5370A42E408D3C79A489" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent_CAA0983881A250BEBC2B3ADC8ED663CD" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_3B3C4D15E50C5370A42E408D3C79A489" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayableCurrent_CAA0983881A250BEBC2B3ADC8ED663CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent_1966E6F025E258DF80C0E863C1F33FF7" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_3B3C4D15E50C5370A42E408D3C79A489" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilitiesCurrent_1966E6F025E258DF80C0E863C1F33FF7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities_9867C2C3A8FB5B1996967D343AFADC1D" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_3B3C4D15E50C5370A42E408D3C79A489" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities_9867C2C3A8FB5B1996967D343AFADC1D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_0C754B1BC9665DA99CBB811F53284F56" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_E9EC1AC799605EBAAC54D3ED32247896" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_0C754B1BC9665DA99CBB811F53284F56" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_E9EC1AC799605EBAAC54D3ED32247896" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets_6091B5B141C059F7B1BBC99DBDE8E508" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_0C754B1BC9665DA99CBB811F53284F56" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets_6091B5B141C059F7B1BBC99DBDE8E508" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/DiscontinuedOperationsResultsOfDiscontinuedOperationsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_9df24e1e-4f19-c5c7-c707-5fdac881a2b1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax" xlink:label="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_52e56524-02d4-55ae-cf85-b242a923fce2" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_9df24e1e-4f19-c5c7-c707-5fdac881a2b1" xlink:to="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_52e56524-02d4-55ae-cf85-b242a923fce2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_736da35c-11e9-6d9d-3b67-e466dbe67859" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_52e56524-02d4-55ae-cf85-b242a923fce2" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue_736da35c-11e9-6d9d-3b67-e466dbe67859" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_39e04e1c-6c14-7968-c9da-b5d42d4a65ab" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_52e56524-02d4-55ae-cf85-b242a923fce2" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold_39e04e1c-6c14-7968-c9da-b5d42d4a65ab" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_dc01c075-d8e0-609f-1ff5-d00aa098db0b" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_52e56524-02d4-55ae-cf85-b242a923fce2" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense_dc01c075-d8e0-609f-1ff5-d00aa098db0b" xlink:type="arc" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense" xlink:label="loc_ktos_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense_8A2308A70B3AFF3933C63E87B61A15B0" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodBeforeIncomeTax_52e56524-02d4-55ae-cf85-b242a923fce2" xlink:to="loc_ktos_DisposalGroupIncludingDiscontinuedOperationOtherIncomeExpense_8A2308A70B3AFF3933C63E87B61A15B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation" xlink:label="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_6a929962-55c4-d534-dec1-e59d6078d631" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_9df24e1e-4f19-c5c7-c707-5fdac881a2b1" xlink:to="loc_us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation_6a929962-55c4-d534-dec1-e59d6078d631" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/DiscontinuedOperationsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/GoodwillAndIntangibleAssets" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/GoodwillAndIntangibleAssetsGoodwillDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_DF91CAA73CE1588FB019220827143E26" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillGross" xlink:label="loc_us-gaap_GoodwillGross_95A3546B9DEE5E109AF95FC8C8711A81" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Goodwill_DF91CAA73CE1588FB019220827143E26" xlink:to="loc_us-gaap_GoodwillGross_95A3546B9DEE5E109AF95FC8C8711A81" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_D29C2F3BB4AB50EC846F064C8A115F18" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Goodwill_DF91CAA73CE1588FB019220827143E26" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_D29C2F3BB4AB50EC846F064C8A115F18" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/GoodwillAndIntangibleAssetsPurchasedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8889606b-88fa-2d5e-3fb9-238bccdf9597" xlink:type="locator" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_IntangibleAssetsExcludingGoodwillGross" xlink:label="loc_ktos_IntangibleAssetsExcludingGoodwillGross_7d030f5b-ad59-e1ab-9fc1-d8c041e56fbd" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8889606b-88fa-2d5e-3fb9-238bccdf9597" xlink:to="loc_ktos_IntangibleAssetsExcludingGoodwillGross_7d030f5b-ad59-e1ab-9fc1-d8c041e56fbd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_65140cb5-12a8-2030-97e2-fa6daceadf40" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_8889606b-88fa-2d5e-3fb9-238bccdf9597" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_65140cb5-12a8-2030-97e2-fa6daceadf40" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_e87bd6a3-2026-a858-f41a-bc281e5d594b" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_e11e8784-8f2d-ca3c-a9e8-a8115d54520c" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_e87bd6a3-2026-a858-f41a-bc281e5d594b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_e11e8784-8f2d-ca3c-a9e8-a8115d54520c" xlink:type="arc" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsNet_e87bd6a3-2026-a858-f41a-bc281e5d594b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_65140cb5-12a8-2030-97e2-fa6daceadf40" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/GoodwillAndIntangibleAssetsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/IncomeTaxes" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/IncomeTaxesAdditionalInformationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/IncomeTaxesIncomeTaxProvisionReconciliationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_7c7e16b8-0aa9-c1c4-f1b1-272374ca83dc" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_7c7e16b8-0aa9-c1c4-f1b1-272374ca83dc" xlink:type="arc" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_IncomeTaxReconciliationStateIncomeTaxesAndForeignIncomeTaxRateDifferential" xlink:label="loc_ktos_IncomeTaxReconciliationStateIncomeTaxesAndForeignIncomeTaxRateDifferential_62e2603d-cea3-0592-3ece-d8c041ea4ea9" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:to="loc_ktos_IncomeTaxReconciliationStateIncomeTaxesAndForeignIncomeTaxRateDifferential_62e2603d-cea3-0592-3ece-d8c041ea4ea9" xlink:type="arc" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_IncomeTaxRateReconciliationAcquisition" xlink:label="loc_ktos_IncomeTaxRateReconciliationAcquisition_bf1b96e8-f5e5-4325-f9a4-d8c041be41e6" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:to="loc_ktos_IncomeTaxRateReconciliationAcquisition_bf1b96e8-f5e5-4325-f9a4-d8c041be41e6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_1d03ef01-9b45-70a3-eec5-a0b41e596976" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_1d03ef01-9b45-70a3-eec5-a0b41e596976" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_49a08e86-47b2-01fa-94cc-0320e102ec63" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_49a08e86-47b2-01fa-94cc-0320e102ec63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxContingencies" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_e51ba957-fbba-d1d2-7272-1520a4ba45da" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_e51ba957-fbba-d1d2-7272-1520a4ba45da" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_a0223de0-196e-53c5-0690-f9f0d2ab9105" xlink:type="locator" />
    <link:calculationArc order="7" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefit_666ca9f0-28f1-b21a-025e-36222808a6c3" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_a0223de0-196e-53c5-0690-f9f0d2ab9105" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/InventoriedCosts" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/InventoriedCostsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings" xlink:label="loc_us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings_0a701ce4-e674-215d-f9dd-4602657c41cb" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryRawMaterialsNetOfReserves" xlink:label="loc_us-gaap_InventoryRawMaterialsNetOfReserves_a142eb63-af8d-4212-6321-d7c0ac27f958" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings_0a701ce4-e674-215d-f9dd-4602657c41cb" xlink:to="loc_us-gaap_InventoryRawMaterialsNetOfReserves_a142eb63-af8d-4212-6321-d7c0ac27f958" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryWorkInProcessNetOfReserves" xlink:label="loc_us-gaap_InventoryWorkInProcessNetOfReserves_f4920785-d6c0-a217-e01a-0e0ef529643a" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings_0a701ce4-e674-215d-f9dd-4602657c41cb" xlink:to="loc_us-gaap_InventoryWorkInProcessNetOfReserves_f4920785-d6c0-a217-e01a-0e0ef529643a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InventoryFinishedGoodsNetOfReserves" xlink:label="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_2dee2782-8369-5635-44bf-51d0e8aa0f1e" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings_0a701ce4-e674-215d-f9dd-4602657c41cb" xlink:to="loc_us-gaap_InventoryFinishedGoodsNetOfReserves_2dee2782-8369-5635-44bf-51d0e8aa0f1e" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/InventoriedCostsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/Leases" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/LeasesAdditionalInformationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/LeasesCashPaidDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/LeasesLeaseExpenseDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseCost" xlink:label="loc_us-gaap_LeaseCost_9748E4C9383859D7856C8E9E55D6FE4F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetAmortization" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_710C1F0CEDAC543C8A3EACA2A1CF1E5E" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_9748E4C9383859D7856C8E9E55D6FE4F" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_710C1F0CEDAC543C8A3EACA2A1CF1E5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseInterestExpense" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_2793D4FFD59750FD93EE7417F9DE49F2" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_9748E4C9383859D7856C8E9E55D6FE4F" xlink:to="loc_us-gaap_FinanceLeaseInterestExpense_2793D4FFD59750FD93EE7417F9DE49F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost" xlink:label="loc_us-gaap_OperatingLeaseCost_AAC67B94C907507FB2713204E7FF8C44" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_9748E4C9383859D7856C8E9E55D6FE4F" xlink:to="loc_us-gaap_OperatingLeaseCost_AAC67B94C907507FB2713204E7FF8C44" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermLeaseCost" xlink:label="loc_us-gaap_ShortTermLeaseCost_C6003326BE765E309E6721BA4C29476D" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_9748E4C9383859D7856C8E9E55D6FE4F" xlink:to="loc_us-gaap_ShortTermLeaseCost_C6003326BE765E309E6721BA4C29476D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableLeaseCost" xlink:label="loc_us-gaap_VariableLeaseCost_6B153D83F3495A40B86218E0EA3482FF" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_9748E4C9383859D7856C8E9E55D6FE4F" xlink:to="loc_us-gaap_VariableLeaseCost_6B153D83F3495A40B86218E0EA3482FF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubleaseIncome" xlink:label="loc_us-gaap_SubleaseIncome_21B6DBDACB0E594CB01B00F955F59A50" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LeaseCost_9748E4C9383859D7856C8E9E55D6FE4F" xlink:to="loc_us-gaap_SubleaseIncome_21B6DBDACB0E594CB01B00F955F59A50" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/LeasesMaturitiesOfOperatingAndFinancingLeaseLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_2F28C3901CBD5AB69305C81657A0B024" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_0BC7732471C5567986B34407FA5218BF" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_2F28C3901CBD5AB69305C81657A0B024" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsRemainderOfFiscalYear_0BC7732471C5567986B34407FA5218BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_57887A90E5E0591F91A8625E3537B812" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_2F28C3901CBD5AB69305C81657A0B024" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_57887A90E5E0591F91A8625E3537B812" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_615E024E3606516FA31B5B38C5EC46EB" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_2F28C3901CBD5AB69305C81657A0B024" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_615E024E3606516FA31B5B38C5EC46EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_22305DDE265759F0BBE44B45C3206559" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_2F28C3901CBD5AB69305C81657A0B024" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_22305DDE265759F0BBE44B45C3206559" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_8460E1849FFD5CFD8D7EDE206AD3DC7E" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_2F28C3901CBD5AB69305C81657A0B024" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_8460E1849FFD5CFD8D7EDE206AD3DC7E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_36896FB2424C5AD49EA7CF35E26A59AE" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_2F28C3901CBD5AB69305C81657A0B024" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_36896FB2424C5AD49EA7CF35E26A59AE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5F78DFDBFC7A5957B45B0109BEA1D5F3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_D706EF34D6505445B64172C67EF68C17" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5F78DFDBFC7A5957B45B0109BEA1D5F3" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_D706EF34D6505445B64172C67EF68C17" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0CAED8613B105706B5AF3A5471B363AE" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5F78DFDBFC7A5957B45B0109BEA1D5F3" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_0CAED8613B105706B5AF3A5471B363AE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_33978B75673254ADB26F7F19352DC5F8" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5F78DFDBFC7A5957B45B0109BEA1D5F3" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_33978B75673254ADB26F7F19352DC5F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_FBE56ACE0D385271B1433126D75BC655" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5F78DFDBFC7A5957B45B0109BEA1D5F3" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_FBE56ACE0D385271B1433126D75BC655" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_89DD9E954C355769BD4E8D88924D0A3E" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5F78DFDBFC7A5957B45B0109BEA1D5F3" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_89DD9E954C355769BD4E8D88924D0A3E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_9D436EC7DEFB580CBEA17FF93A3C6E47" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5F78DFDBFC7A5957B45B0109BEA1D5F3" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_9D436EC7DEFB580CBEA17FF93A3C6E47" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/LeasesMaturitiesOfOperatingAndFinancingLeaseLiabilitiesDetailsCalc2" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_1CD2F831E199AC92F2A0D8C0667CC9A3_5F78DFDBFC7A5957B45B0109BEA1D5F3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_1CD2F831E199AC92F2A0D8C0667CC9A3_FC44F355551351138CF91CCEA8ECE3FD" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_1CD2F831E199AC92F2A0D8C0667CC9A3_5F78DFDBFC7A5957B45B0109BEA1D5F3" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_1CD2F831E199AC92F2A0D8C0667CC9A3_FC44F355551351138CF91CCEA8ECE3FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_1CD2F831E199AC92F2A0D8C0667CC9A3_DFADEB8339505727BA124BFBA5FD7874" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_1CD2F831E199AC92F2A0D8C0667CC9A3_5F78DFDBFC7A5957B45B0109BEA1D5F3" xlink:to="loc_us-gaap_OperatingLeaseLiability_1CD2F831E199AC92F2A0D8C0667CC9A3_DFADEB8339505727BA124BFBA5FD7874" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_1CD2F831E199AC92F2A0D8C0667CC9A3_2F28C3901CBD5AB69305C81657A0B024" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_1CD2F831E199AC92F2A0D8C0667CC9A3_554D4F4C1F865AACB6B5B780F986573A" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_1CD2F831E199AC92F2A0D8C0667CC9A3_2F28C3901CBD5AB69305C81657A0B024" xlink:to="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_1CD2F831E199AC92F2A0D8C0667CC9A3_554D4F4C1F865AACB6B5B780F986573A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinanceLeaseLiability" xlink:label="loc_us-gaap_FinanceLeaseLiability_1CD2F831E199AC92F2A0D8C0667CC9A3_3E6C911CE8A05DA4A7E987D7C39B1CF1" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_1CD2F831E199AC92F2A0D8C0667CC9A3_2F28C3901CBD5AB69305C81657A0B024" xlink:to="loc_us-gaap_FinanceLeaseLiability_1CD2F831E199AC92F2A0D8C0667CC9A3_3E6C911CE8A05DA4A7E987D7C39B1CF1" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/LeasesOperatingLeaseUnderAsc840Details" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDue" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_BA35B6E846F35EB68AC1DC16850A0D2F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_3568F413AFAD596C87A1C4E468DDF8DF" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_BA35B6E846F35EB68AC1DC16850A0D2F" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent_3568F413AFAD596C87A1C4E468DDF8DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_75222C5678BD55199697EA2328B4D72E" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_BA35B6E846F35EB68AC1DC16850A0D2F" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears_75222C5678BD55199697EA2328B4D72E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3E3C838799AC5AA4BCF69AEEC9C5F591" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_BA35B6E846F35EB68AC1DC16850A0D2F" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears_3E3C838799AC5AA4BCF69AEEC9C5F591" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6C482748EC815D39BA9621DEF1451926" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_BA35B6E846F35EB68AC1DC16850A0D2F" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears_6C482748EC815D39BA9621DEF1451926" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_3A15035F220A54E3BC12A136B1575CB9" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_BA35B6E846F35EB68AC1DC16850A0D2F" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears_3A15035F220A54E3BC12A136B1575CB9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter" xlink:label="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_789162BB965B5B79B998E66CE7975BFA" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDue_BA35B6E846F35EB68AC1DC16850A0D2F" xlink:to="loc_us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter_789162BB965B5B79B998E66CE7975BFA" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/LeasesSupplementalBalanceSheetDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/LeasesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/LeasesWeightedAverageDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/NetIncomeLossPerCommonShare" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/NetIncomeLossPerCommonShareDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/RedeemableNoncontrollingInterest" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/RedeemableNoncontrollingInterestDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/RevenueRecognition" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/RevenueRecognitionContractAssetsAndLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="ktos-20190929.xsd#ktos_ContractWithCustomerAssetLiabilityNet" xlink:label="loc_ktos_ContractWithCustomerAssetLiabilityNet_BAD2C3633E555B0AA8E748512B6A07C0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerAssetNet" xlink:label="loc_us-gaap_ContractWithCustomerAssetNet_45F2B8C024615DDCA4CE8C8A0C142EE5" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ktos_ContractWithCustomerAssetLiabilityNet_BAD2C3633E555B0AA8E748512B6A07C0" xlink:to="loc_us-gaap_ContractWithCustomerAssetNet_45F2B8C024615DDCA4CE8C8A0C142EE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiability" xlink:label="loc_us-gaap_ContractWithCustomerLiability_4025210938D45F0A84EFF9B2252BE2F4" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ktos_ContractWithCustomerAssetLiabilityNet_BAD2C3633E555B0AA8E748512B6A07C0" xlink:to="loc_us-gaap_ContractWithCustomerLiability_4025210938D45F0A84EFF9B2252BE2F4" xlink:type="arc" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_ContractWithCustomerAssetLiabilityNetIncreaseDecrease" xlink:label="loc_ktos_ContractWithCustomerAssetLiabilityNetIncreaseDecrease_AA79287899245FCD96C8A85BC4B4EC26" xlink:type="locator" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_ContractWithCustomerAssetIncreaseDecrease" xlink:label="loc_ktos_ContractWithCustomerAssetIncreaseDecrease_3661266E5B1452448218C6524CDE077F" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ktos_ContractWithCustomerAssetLiabilityNetIncreaseDecrease_AA79287899245FCD96C8A85BC4B4EC26" xlink:to="loc_ktos_ContractWithCustomerAssetIncreaseDecrease_3661266E5B1452448218C6524CDE077F" xlink:type="arc" />
    <link:loc xlink:href="ktos-20190929.xsd#ktos_ContractWithCustomerLiabilityIncreaseDecrease" xlink:label="loc_ktos_ContractWithCustomerLiabilityIncreaseDecrease_F8FE07BAC0F653F080766D4D92412801" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_ktos_ContractWithCustomerAssetLiabilityNetIncreaseDecrease_AA79287899245FCD96C8A85BC4B4EC26" xlink:to="loc_ktos_ContractWithCustomerLiabilityIncreaseDecrease_F8FE07BAC0F653F080766D4D92412801" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/RevenueRecognitionDisaggregationOfRevenueDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/RevenueRecognitionNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/RevenueRecognitionRemainingPerformanceObligationsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/RevenueRecognitionTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/SegmentInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/SegmentInformationAdditionalInformationDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/SegmentInformationScheduleOfSegmentRevenuesDepreciationAndAmortizationAndOperatingLossDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/SignificantCustomers" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/SignificantCustomersDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/SummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/SummaryOfSignificantAccountingPoliciesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.kratosdefense.com/role/SummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
</link:linkbase>
