<?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.humana.com/role/AcquisitionsAndDivestitures" xlink:href="hum-20200331.xsd#AcquisitionsAndDivestitures" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/AcquisitionsAndDivestituresNarrativeDetails" xlink:href="hum-20200331.xsd#AcquisitionsAndDivestituresNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/BasisOfPresentationAndSignificantEvents" xlink:href="hum-20200331.xsd#BasisOfPresentationAndSignificantEvents" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/BasisOfPresentationAndSignificantEventsNarrativeDetails" xlink:href="hum-20200331.xsd#BasisOfPresentationAndSignificantEventsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/BenefitsPayable" xlink:href="hum-20200331.xsd#BenefitsPayable" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/BenefitsPayableActivityInBenefitsPayableDetails" xlink:href="hum-20200331.xsd#BenefitsPayableActivityInBenefitsPayableDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/BenefitsPayableReconciliationToConsolidatedDetails" xlink:href="hum-20200331.xsd#BenefitsPayableReconciliationToConsolidatedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/BenefitsPayableTables" xlink:href="hum-20200331.xsd#BenefitsPayableTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/CommitmentsGuaranteesAndContingencies" xlink:href="hum-20200331.xsd#CommitmentsGuaranteesAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/CommitmentsGuaranteesAndContingenciesDetails" xlink:href="hum-20200331.xsd#CommitmentsGuaranteesAndContingenciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/CondensedConsolidatedBalanceSheets" xlink:href="hum-20200331.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="hum-20200331.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="hum-20200331.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:href="hum-20200331.xsd#CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/CondensedConsolidatedStatementsOfIncome" xlink:href="hum-20200331.xsd#CondensedConsolidatedStatementsOfIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/CondensedConsolidatedStatementsOfStockholdersEquity" xlink:href="hum-20200331.xsd#CondensedConsolidatedStatementsOfStockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/CoverPage" xlink:href="hum-20200331.xsd#CoverPage" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/Debt" xlink:href="hum-20200331.xsd#Debt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/DebtCommercialPaperDetails" xlink:href="hum-20200331.xsd#DebtCommercialPaperDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/DebtCreditAgreementDetails" xlink:href="hum-20200331.xsd#DebtCreditAgreementDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/DebtDebtOutstandingDetails" xlink:href="hum-20200331.xsd#DebtDebtOutstandingDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/DebtSeniorNotesDetails" xlink:href="hum-20200331.xsd#DebtSeniorNotesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/DebtTables" xlink:href="hum-20200331.xsd#DebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/DebtTermNoteDetails" xlink:href="hum-20200331.xsd#DebtTermNoteDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/EarningsPerCommonShareComputation" xlink:href="hum-20200331.xsd#EarningsPerCommonShareComputation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/EarningsPerCommonShareComputationDetails" xlink:href="hum-20200331.xsd#EarningsPerCommonShareComputationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/EarningsPerCommonShareComputationTables" xlink:href="hum-20200331.xsd#EarningsPerCommonShareComputationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/FairValue" xlink:href="hum-20200331.xsd#FairValue" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/FairValueFinancialAssetsMeasuredOnRecurringBasisDetails" xlink:href="hum-20200331.xsd#FairValueFinancialAssetsMeasuredOnRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/FairValueNarrativeDetails" xlink:href="hum-20200331.xsd#FairValueNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/FairValuePutAndCallOptionsMeasuredAtFairValueDetails" xlink:href="hum-20200331.xsd#FairValuePutAndCallOptionsMeasuredAtFairValueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/FairValueTables" xlink:href="hum-20200331.xsd#FairValueTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/GoodwillAndOtherIntangibleAssets" xlink:href="hum-20200331.xsd#GoodwillAndOtherIntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/GoodwillAndOtherIntangibleAssetsAmortizationAndEstimatedFutureAmortizationExpenseDetails" xlink:href="hum-20200331.xsd#GoodwillAndOtherIntangibleAssetsAmortizationAndEstimatedFutureAmortizationExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/GoodwillAndOtherIntangibleAssetsGoodwillBySegmentsDetails" xlink:href="hum-20200331.xsd#GoodwillAndOtherIntangibleAssetsGoodwillBySegmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/GoodwillAndOtherIntangibleAssetsIntangibleAssetsIncludedInOtherLongTermAssetsDetails" xlink:href="hum-20200331.xsd#GoodwillAndOtherIntangibleAssetsIntangibleAssetsIncludedInOtherLongTermAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/GoodwillAndOtherIntangibleAssetsTables" xlink:href="hum-20200331.xsd#GoodwillAndOtherIntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/IncomeTaxes" xlink:href="hum-20200331.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/IncomeTaxesDetails" xlink:href="hum-20200331.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/InvestmentSecurities" xlink:href="hum-20200331.xsd#InvestmentSecurities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/InvestmentSecuritiesContractualMaturitiesOfDebtSecuritiesAvailableForSaleDetails" xlink:href="hum-20200331.xsd#InvestmentSecuritiesContractualMaturitiesOfDebtSecuritiesAvailableForSaleDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/InvestmentSecuritiesGrossUnrealizedLossesAndFairValuesOfSecuritiesDetails" xlink:href="hum-20200331.xsd#InvestmentSecuritiesGrossUnrealizedLossesAndFairValuesOfSecuritiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/InvestmentSecuritiesNarrativeDetails" xlink:href="hum-20200331.xsd#InvestmentSecuritiesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/InvestmentSecuritiesRealizedGainsLossesWithinInvestmentIncomeDetails" xlink:href="hum-20200331.xsd#InvestmentSecuritiesRealizedGainsLossesWithinInvestmentIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/InvestmentSecuritiesSecuritiesClassifiedAsCurrentAndLongTermDetails" xlink:href="hum-20200331.xsd#InvestmentSecuritiesSecuritiesClassifiedAsCurrentAndLongTermDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/InvestmentSecuritiesTables" xlink:href="hum-20200331.xsd#InvestmentSecuritiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/MedicarePartD" xlink:href="hum-20200331.xsd#MedicarePartD" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/MedicarePartDDetails" xlink:href="hum-20200331.xsd#MedicarePartDDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/MedicarePartDTables" xlink:href="hum-20200331.xsd#MedicarePartDTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/RecentlyIssuedAccountingPronouncements" xlink:href="hum-20200331.xsd#RecentlyIssuedAccountingPronouncements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/RecentlyIssuedAccountingPronouncementsPolicies" xlink:href="hum-20200331.xsd#RecentlyIssuedAccountingPronouncementsPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/SegmentInformation" xlink:href="hum-20200331.xsd#SegmentInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/SegmentInformationNarrativeDetails" xlink:href="hum-20200331.xsd#SegmentInformationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/SegmentInformationSegmentResultsDetails" xlink:href="hum-20200331.xsd#SegmentInformationSegmentResultsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/SegmentInformationTables" xlink:href="hum-20200331.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/StockholdersEquity" xlink:href="hum-20200331.xsd#StockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/StockholdersEquityNarrativeDetails" xlink:href="hum-20200331.xsd#StockholdersEquityNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/StockholdersEquityScheduleOfDetailsOfDividendPaymentsDetails" xlink:href="hum-20200331.xsd#StockholdersEquityScheduleOfDetailsOfDividendPaymentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.humana.com/role/StockholdersEquityTables" xlink:href="hum-20200331.xsd#StockholdersEquityTables" xlink:type="simple" />
  <link:calculationLink xlink:role="http://www.humana.com/role/AcquisitionsAndDivestitures" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/AcquisitionsAndDivestituresNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/BasisOfPresentationAndSignificantEvents" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/BasisOfPresentationAndSignificantEventsNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/BenefitsPayable" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/BenefitsPayableActivityInBenefitsPayableDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_d8f63898-4459-5fff-0e7a-e5ce271818ac" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense_4de47903-8980-491e-a005-9d6fcf669df1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_d8f63898-4459-5fff-0e7a-e5ce271818ac" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense_4de47903-8980-491e-a005-9d6fcf669df1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense" xlink:label="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_7cd7aeac-daa5-55ab-c126-aed30065b1de" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseIncurredClaims1_d8f63898-4459-5fff-0e7a-e5ce271818ac" xlink:to="loc_us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense_7cd7aeac-daa5-55ab-c126-aed30065b1de" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForLossesAndLossAdjustmentExpense" xlink:label="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_4a09b102-4796-3f11-5735-c1e035a996f0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1_04da4ee7-f521-b045-0459-5ddb7480d030" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_4a09b102-4796-3f11-5735-c1e035a996f0" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1_04da4ee7-f521-b045-0459-5ddb7480d030" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1" xlink:label="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1_67ba34ec-e3e8-6c46-146a-ddb0928dee95" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_PaymentsForLossesAndLossAdjustmentExpense_4a09b102-4796-3f11-5735-c1e035a996f0" xlink:to="loc_us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1_67ba34ec-e3e8-6c46-146a-ddb0928dee95" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/BenefitsPayableReconciliationToConsolidatedDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/BenefitsPayableTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/CommitmentsGuaranteesAndContingencies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/CommitmentsGuaranteesAndContingenciesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.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_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_AvailableForSaleSecuritiesDebtSecuritiesCurrent" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_e2b10c93-5dbd-d345-d7e4-6144b8287c24" 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_AvailableForSaleSecuritiesDebtSecuritiesCurrent_e2b10c93-5dbd-d345-d7e4-6144b8287c24" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ReceivablesNetCurrent" xlink:label="loc_us-gaap_ReceivablesNetCurrent_c4de65c9-dd27-7a0a-0b7a-4158d1967739" 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_ReceivablesNetCurrent_c4de65c9-dd27-7a0a-0b7a-4158d1967739" 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="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_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_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_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent_4f186fae-5cc1-820d-f772-86ccd7a87074" 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_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent_4f186fae-5cc1-820d-f772-86ccd7a87074" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaap_EquityMethodInvestments_ed3f9f23-c931-eaa1-1c75-4ff1fe970e7d" 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_EquityMethodInvestments_ed3f9f23-c931-eaa1-1c75-4ff1fe970e7d" 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="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_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_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: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_LiabilityForClaimsAndClaimsAdjustmentExpense" xlink:label="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense_abd16f49-26bc-4cce-6af2-35474b4f0a92" 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_LiabilityForClaimsAndClaimsAdjustmentExpense_abd16f49-26bc-4cce-6af2-35474b4f0a92" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_9a34fc5e-00bc-420c-8698-6e19b92b8e39" 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_AccountsPayableAndAccruedLiabilitiesCurrent_9a34fc5e-00bc-420c-8698-6e19b92b8e39" xlink:type="arc" />
    <link:loc xlink:href="hum-20200331.xsd#hum_BookOverdraftLiability" xlink:label="loc_hum_BookOverdraftLiability_8AA48F845813CADE4E8DD91C039B9B92" 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_hum_BookOverdraftLiability_8AA48F845813CADE4E8DD91C039B9B92" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_68a2ece1-b79e-558c-a305-f3ccae8c21c3" 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_ContractWithCustomerLiabilityCurrent_68a2ece1-b79e-558c-a305-f3ccae8c21c3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtCurrent" xlink:label="loc_us-gaap_DebtCurrent_1417330d-29f9-c4e9-abb6-2898d623f603" 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_DebtCurrent_1417330d-29f9-c4e9-abb6-2898d623f603" 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_LiabilityForFuturePolicyBenefits" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_f48a7414-6d80-fbef-a14d-efb0af681c37" 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_LiabilityForFuturePolicyBenefits_f48a7414-6d80-fbef-a14d-efb0af681c37" 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_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_4b9904d8-8624-0dbb-a949-29ff2cf808a8" 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_StockholdersEquity_4b9904d8-8624-0dbb-a949-29ff2cf808a8" 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_StockholdersEquity_4b9904d8-8624-0dbb-a949-29ff2cf808a8" 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_StockholdersEquity_4b9904d8-8624-0dbb-a949-29ff2cf808a8" 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_StockholdersEquity_4b9904d8-8624-0dbb-a949-29ff2cf808a8" 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_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_62305d8f-d807-0fe8-d0ab-f2c2b3d03011" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b9904d8-8624-0dbb-a949-29ff2cf808a8" 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_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_988c1346-b444-a867-fe80-f3aec1443d54" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b9904d8-8624-0dbb-a949-29ff2cf808a8" 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_TreasuryStockValue" xlink:label="loc_us-gaap_TreasuryStockValue_e6069c8d-dfec-45ff-4b3f-643d125d5b29" xlink:type="locator" />
    <link:calculationArc order="6" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_4b9904d8-8624-0dbb-a949-29ff2cf808a8" xlink:to="loc_us-gaap_TreasuryStockValue_e6069c8d-dfec-45ff-4b3f-643d125d5b29" 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:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.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_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" 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_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" 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:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_NetIncomeLoss_e170ce1e-c3a8-e8ee-88b0-37e8dd7b1d11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_70a92108-04c8-ea13-dcdc-b3b1e3a5458e" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_70a92108-04c8-ea13-dcdc-b3b1e3a5458e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_86dec120-3352-31c8-fc61-55992f948bdd" xlink:type="locator" />
    <link:calculationArc order="3" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_86dec120-3352-31c8-fc61-55992f948bdd" 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="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_ShareBasedCompensation_f0b9d825-b0b9-37fd-4d25-9294a8598890" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_848cd271-4e03-8c13-d21d-e6ec9c3916f7" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_Depreciation_848cd271-4e03-8c13-d21d-e6ec9c3916f7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_725ae160-1b15-a075-fa62-729d0bc8cda1" xlink:type="locator" />
    <link:calculationArc order="6" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_725ae160-1b15-a075-fa62-729d0bc8cda1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInDeferredIncomeTaxes" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_0074e2ce-7b7b-56f1-34ed-f9d5bd5d1c3d" xlink:type="locator" />
    <link:calculationArc order="7" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredIncomeTaxes_0074e2ce-7b7b-56f1-34ed-f9d5bd5d1c3d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInReceivables" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_a6b55487-86c4-3218-b33b-75029447f45e" xlink:type="locator" />
    <link:calculationArc order="8" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivables_a6b55487-86c4-3218-b33b-75029447f45e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_5550ae9d-a6e2-fc35-fc50-54521e2bfb5d" xlink:type="locator" />
    <link:calculationArc order="9" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingAssets_5550ae9d-a6e2-fc35-fc50-54521e2bfb5d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInHealthCareInsuranceLiabilities" xlink:label="loc_us-gaap_IncreaseDecreaseInHealthCareInsuranceLiabilities_d39e921a-42c2-3bea-884c-fa315fae8c86" xlink:type="locator" />
    <link:calculationArc order="10" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_IncreaseDecreaseInHealthCareInsuranceLiabilities_d39e921a-42c2-3bea-884c-fa315fae8c86" 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="11" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" 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_IncreaseDecreaseInContractWithCustomerLiability" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_8fa19589-0da6-036d-a79e-4bd2fa365a6d" xlink:type="locator" />
    <link:calculationArc order="12" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" 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_OtherOperatingActivitiesCashFlowStatement" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_1571e7d6-d666-48e2-395f-6e58ea563df3" xlink:type="locator" />
    <link:calculationArc order="13" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_ce0d7b63-a366-bc9b-79e1-780981e428fe" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_1571e7d6-d666-48e2-395f-6e58ea563df3" 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_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" 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_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_0f8df60b-841f-6df5-83c3-e4049d366459" 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_PaymentsToAcquirePropertyPlantAndEquipment_0f8df60b-841f-6df5-83c3-e4049d366459" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_8b51ae5f-8f14-ae0e-00e7-8f4e716f2f96" 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_PaymentsToAcquireAvailableForSaleSecuritiesDebt_8b51ae5f-8f14-ae0e-00e7-8f4e716f2f96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_e3f9215c-1f64-e636-ccb3-9c51d05b0a6d" xlink:type="locator" />
    <link:calculationArc order="4" 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_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_e3f9215c-1f64-e636-ccb3-9c51d05b0a6d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_d1d20cfe-f038-824a-0236-247c2a122ebc" xlink:type="locator" />
    <link:calculationArc order="5" 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_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_d1d20cfe-f038-824a-0236-247c2a122ebc" 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_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_50231013-f048-89e7-0e20-ba139224c5f7" 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_IncreaseDecreaseInOtherDeposits" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherDeposits_86389cf8-d260-1e73-912e-52f35012a2bf" 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_IncreaseDecreaseInOtherDeposits_86389cf8-d260-1e73-912e-52f35012a2bf" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_7b833212-d46c-4ee0-30ea-7217723a0d68" 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_ProceedsFromIssuanceOfSeniorLongTermDebt_7b833212-d46c-4ee0-30ea-7217723a0d68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommercialPaper" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommercialPaper_ed20adc9-55fa-7c45-092f-f368f4ea4bea" 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_ProceedsFromIssuanceOfCommercialPaper_ed20adc9-55fa-7c45-092f-f368f4ea4bea" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromNotesPayable" xlink:label="loc_us-gaap_ProceedsFromNotesPayable_b0a43552-ce29-1594-126b-d081767256fc" 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_ProceedsFromNotesPayable_b0a43552-ce29-1594-126b-d081767256fc" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInBookOverdrafts" xlink:label="loc_us-gaap_IncreaseDecreaseInBookOverdrafts_c743f2c7-19cc-1427-5b77-eeb789f041df" 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_IncreaseDecreaseInBookOverdrafts_c743f2c7-19cc-1427-5b77-eeb789f041df" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_3f804297-91a1-3939-541d-a39b6288c9f9" xlink:type="locator" />
    <link:calculationArc order="6" 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_PaymentsForRepurchaseOfCommonStock_3f804297-91a1-3939-541d-a39b6288c9f9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsOfDividends" xlink:label="loc_us-gaap_PaymentsOfDividends_97b2cb74-f62e-ba8a-3953-eb9af3cfb8a4" xlink:type="locator" />
    <link:calculationArc order="7" 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_PaymentsOfDividends_97b2cb74-f62e-ba8a-3953-eb9af3cfb8a4" xlink:type="arc" />
    <link:loc xlink:href="hum-20200331.xsd#hum_ProceedsFromStockOptionsExercisedAndOther" xlink:label="loc_hum_ProceedsFromStockOptionsExercisedAndOther_ad34a934-8ac9-ade7-bed5-d8eb359b67b8" xlink:type="locator" />
    <link:calculationArc order="8" 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_hum_ProceedsFromStockOptionsExercisedAndOther_ad34a934-8ac9-ade7-bed5-d8eb359b67b8" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/CondensedConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended">
    <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_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_e170ce1e-c3a8-e8ee-88b0-37e8dd7b1d11" 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_NetIncomeLoss_e170ce1e-c3a8-e8ee-88b0-37e8dd7b1d11" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_5e0cb0dc-b25c-aaae-62f8-cb90f31a16a1" 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_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_5e0cb0dc-b25c-aaae-62f8-cb90f31a16a1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_e88bd855-1cc4-7d92-7586-c29e344f0391" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_5e0cb0dc-b25c-aaae-62f8-cb90f31a16a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_e88bd855-1cc4-7d92-7586-c29e344f0391" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_0d4250f9-c67e-da85-5b79-7bf5ce074ba3" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_e88bd855-1cc4-7d92-7586-c29e344f0391" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_0d4250f9-c67e-da85-5b79-7bf5ce074ba3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_b8ef4814-1b76-0342-9351-7f079381cc1f" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_e88bd855-1cc4-7d92-7586-c29e344f0391" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax_b8ef4814-1b76-0342-9351-7f079381cc1f" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_dea146b3-6d50-c215-7c85-641051f14bf2" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_5e0cb0dc-b25c-aaae-62f8-cb90f31a16a1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_dea146b3-6d50-c215-7c85-641051f14bf2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_05203cd1-680d-aa15-aec2-1af403c987fb" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_dea146b3-6d50-c215-7c85-641051f14bf2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax_05203cd1-680d-aa15-aec2-1af403c987fb" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_cfbcfdf1-88f8-5111-04af-e52617367bf1" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax_dea146b3-6d50-c215-7c85-641051f14bf2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax_cfbcfdf1-88f8-5111-04af-e52617367bf1" xlink:type="arc" />
    <link:loc xlink:href="hum-20200331.xsd#hum_ComprehensiveIncomeLossNetofTaxAttributableToEquityMethodInvestments" xlink:label="loc_hum_ComprehensiveIncomeLossNetofTaxAttributableToEquityMethodInvestments_5c646b1c-5278-bae4-bfc8-cf91fb3ce1f5" xlink:type="locator" />
    <link:calculationArc order="3" 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_hum_ComprehensiveIncomeLossNetofTaxAttributableToEquityMethodInvestments_5c646b1c-5278-bae4-bfc8-cf91fb3ce1f5" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/CondensedConsolidatedStatementsOfIncome" xlink:type="extended">
    <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_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_NetIncomeLoss_e170ce1e-c3a8-e8ee-88b0-37e8dd7b1d11" 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_Revenues" xlink:label="loc_us-gaap_Revenues_425ada39-f194-a279-47ac-dd09cf899fb1" 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_Revenues_425ada39-f194-a279-47ac-dd09cf899fb1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BenefitsLossesAndExpenses" xlink:label="loc_us-gaap_BenefitsLossesAndExpenses_cec74385-9235-9cd5-178d-c2c7a4ce2554" 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_BenefitsLossesAndExpenses_cec74385-9235-9cd5-178d-c2c7a4ce2554" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredHealthCare" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredHealthCare_0b0c6c9c-9c42-e7b5-1193-3b78881c2b7c" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BenefitsLossesAndExpenses_cec74385-9235-9cd5-178d-c2c7a4ce2554" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredHealthCare_0b0c6c9c-9c42-e7b5-1193-3b78881c2b7c" 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_BenefitsLossesAndExpenses_cec74385-9235-9cd5-178d-c2c7a4ce2554" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_89fcc343-1933-1e77-588e-68d1c2f1a04f" xlink:type="arc" />
    <link:loc xlink:href="hum-20200331.xsd#hum_DepreciationAndAmortizationIncomeStatement" xlink:label="loc_hum_DepreciationAndAmortizationIncomeStatement_ba07128f-3c09-8537-b16f-cf91fb141246" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_BenefitsLossesAndExpenses_cec74385-9235-9cd5-178d-c2c7a4ce2554" xlink:to="loc_hum_DepreciationAndAmortizationIncomeStatement_ba07128f-3c09-8537-b16f-cf91fb141246" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_16e9f6a6-5524-a7b1-7e7c-73ee97610ec6" 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_InterestExpense_16e9f6a6-5524-a7b1-7e7c-73ee97610ec6" 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="3" 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_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_NetIncomeLoss_e170ce1e-c3a8-e8ee-88b0-37e8dd7b1d11" 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_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_86dec120-3352-31c8-fc61-55992f948bdd" xlink:type="locator" />
    <link:calculationArc order="3" 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_IncomeLossFromEquityMethodInvestments_86dec120-3352-31c8-fc61-55992f948bdd" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/CondensedConsolidatedStatementsOfStockholdersEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/CoverPage" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/Debt" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/DebtCommercialPaperDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/DebtCreditAgreementDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/DebtDebtOutstandingDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtCurrent" xlink:label="loc_us-gaap_DebtCurrent_1417330d-29f9-c4e9-abb6-2898d623f603" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShortTermBorrowings" xlink:label="loc_us-gaap_ShortTermBorrowings_fbad1c71-c688-bf79-7c97-4a7fcf9b1e62" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtCurrent_1417330d-29f9-c4e9-abb6-2898d623f603" xlink:to="loc_us-gaap_ShortTermBorrowings_fbad1c71-c688-bf79-7c97-4a7fcf9b1e62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_4909d223-7980-3e65-3e19-5f45ac16b538" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtCurrent_1417330d-29f9-c4e9-abb6-2898d623f603" xlink:to="loc_us-gaap_LongTermDebtCurrent_4909d223-7980-3e65-3e19-5f45ac16b538" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/DebtSeniorNotesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/DebtTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/DebtTermNoteDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/EarningsPerCommonShareComputation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/EarningsPerCommonShareComputationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3B97A64F57EF5D23B2AC2C288E8B5B64" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_B5E86D46EA43548899847E4FDF3D7FC2" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3B97A64F57EF5D23B2AC2C288E8B5B64" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_B5E86D46EA43548899847E4FDF3D7FC2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_0EB3DA3F13385930A8BA7B207BB1DA29" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_3B97A64F57EF5D23B2AC2C288E8B5B64" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_0EB3DA3F13385930A8BA7B207BB1DA29" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/EarningsPerCommonShareComputationTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/FairValue" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/FairValueFinancialAssetsMeasuredOnRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_a0a5801b-c8ce-1793-dd5f-edbcde4cc5a3" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_554f95d2-cb4f-eb2c-68b3-7e12c8578a72" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_a0a5801b-c8ce-1793-dd5f-edbcde4cc5a3" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_554f95d2-cb4f-eb2c-68b3-7e12c8578a72" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_e562c48b-3e99-2c57-8e96-c3b81056b58c" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_a0a5801b-c8ce-1793-dd5f-edbcde4cc5a3" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_e562c48b-3e99-2c57-8e96-c3b81056b58c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquitySecuritiesFvNi" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_c88e6350-e26e-969b-2f36-fb6881edab88" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsFairValueDisclosure_a0a5801b-c8ce-1793-dd5f-edbcde4cc5a3" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_c88e6350-e26e-969b-2f36-fb6881edab88" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/FairValueNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/FairValuePutAndCallOptionsMeasuredAtFairValueDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/FairValueTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/GoodwillAndOtherIntangibleAssets" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/GoodwillAndOtherIntangibleAssetsAmortizationAndEstimatedFutureAmortizationExpenseDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/GoodwillAndOtherIntangibleAssetsGoodwillBySegmentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/GoodwillAndOtherIntangibleAssetsIntangibleAssetsIncludedInOtherLongTermAssetsDetails" 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_C7898B0FCC6C503C8AE7CFF2951FE746" 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_3C0B75BE2C735CB4AB25061063C27BD2" 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_C7898B0FCC6C503C8AE7CFF2951FE746" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_3C0B75BE2C735CB4AB25061063C27BD2" 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_7490A8AE33BD5E63970A5A615CF132E5" 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_C7898B0FCC6C503C8AE7CFF2951FE746" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_7490A8AE33BD5E63970A5A615CF132E5" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/GoodwillAndOtherIntangibleAssetsTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/IncomeTaxes" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/IncomeTaxesDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/InvestmentSecurities" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/InvestmentSecuritiesContractualMaturitiesOfDebtSecuritiesAvailableForSaleDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_277B3FA5D6E3546BB968B1FE1C023898" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_5FF8BF80117C53DEB690B0EE432E862A" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_277B3FA5D6E3546BB968B1FE1C023898" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_5FF8BF80117C53DEB690B0EE432E862A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_1AC0927916875893AF4B79015E2C6321" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_277B3FA5D6E3546BB968B1FE1C023898" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_1AC0927916875893AF4B79015E2C6321" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_B8459148321652D0A6B705BE69886B10" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_277B3FA5D6E3546BB968B1FE1C023898" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_B8459148321652D0A6B705BE69886B10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_739B4B0E71835649B8D40C2BF1CE6188" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_277B3FA5D6E3546BB968B1FE1C023898" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_739B4B0E71835649B8D40C2BF1CE6188" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_34E9C79AD9C25745BD629A3D9FECD9F4" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_277B3FA5D6E3546BB968B1FE1C023898" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_34E9C79AD9C25745BD629A3D9FECD9F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_C888FBCF044D54CDB02F27C7FDB9BD34" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_CFB1D9128EF0554EB5CA5687D74CB483" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_C888FBCF044D54CDB02F27C7FDB9BD34" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_CFB1D9128EF0554EB5CA5687D74CB483" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_2A991B3EEBCB581F8D1E9A13DAF13042" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_C888FBCF044D54CDB02F27C7FDB9BD34" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_2A991B3EEBCB581F8D1E9A13DAF13042" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_07DCDFF267025456A2474B5452ED1DBF" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_C888FBCF044D54CDB02F27C7FDB9BD34" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_07DCDFF267025456A2474B5452ED1DBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_FF9D901B96525A50810EE70A5565434F" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_C888FBCF044D54CDB02F27C7FDB9BD34" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_FF9D901B96525A50810EE70A5565434F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_73D719C024775857A1275C7850FC6C91" xlink:type="locator" />
    <link:calculationArc order="5" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_C888FBCF044D54CDB02F27C7FDB9BD34" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_73D719C024775857A1275C7850FC6C91" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/InvestmentSecuritiesGrossUnrealizedLossesAndFairValuesOfSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_447294e8-f4eb-2b40-51a5-60fa019f8c40" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_44b817b0-a9ec-08a0-e6d5-8738955fbd29" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_447294e8-f4eb-2b40-51a5-60fa019f8c40" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_44b817b0-a9ec-08a0-e6d5-8738955fbd29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_f50bd4fe-0acd-ab98-c92a-d313822079c5" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_447294e8-f4eb-2b40-51a5-60fa019f8c40" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_f50bd4fe-0acd-ab98-c92a-d313822079c5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_bd4abe0a-6fe6-2d88-cf98-52c493407bcd" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_7d2f9305-3a51-279b-17e9-0a8bec7eba1b" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_bd4abe0a-6fe6-2d88-cf98-52c493407bcd" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_7d2f9305-3a51-279b-17e9-0a8bec7eba1b" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_fe6fe2fb-1c28-638d-7c2f-bc065610ad60" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_bd4abe0a-6fe6-2d88-cf98-52c493407bcd" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_fe6fe2fb-1c28-638d-7c2f-bc065610ad60" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/InvestmentSecuritiesNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/InvestmentSecuritiesRealizedGainsLossesWithinInvestmentIncomeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_70a92108-04c8-ea13-dcdc-b3b1e3a5458e" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedGain" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_bf959114-1fbc-5fda-8c0b-dc77a3be947c" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_70a92108-04c8-ea13-dcdc-b3b1e3a5458e" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGain_bf959114-1fbc-5fda-8c0b-dc77a3be947c" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_ffa1d70b-a245-36db-5216-ebca5e8dfa6d" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss_70a92108-04c8-ea13-dcdc-b3b1e3a5458e" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss_ffa1d70b-a245-36db-5216-ebca5e8dfa6d" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/InvestmentSecuritiesSecuritiesClassifiedAsCurrentAndLongTermDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_27940abc-0cb4-eab4-8ef0-df4a4c0bb415" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_9fbaf9cb-468f-3b91-9cf2-18d26152173d" xlink:type="locator" />
    <link:calculationArc order="1" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_27940abc-0cb4-eab4-8ef0-df4a4c0bb415" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_9fbaf9cb-468f-3b91-9cf2-18d26152173d" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_a23ab896-034e-8e96-1a84-63ffb40e496e" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_27940abc-0cb4-eab4-8ef0-df4a4c0bb415" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_a23ab896-034e-8e96-1a84-63ffb40e496e" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_e562c48b-3e99-2c57-8e96-c3b81056b58c" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_27940abc-0cb4-eab4-8ef0-df4a4c0bb415" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_e562c48b-3e99-2c57-8e96-c3b81056b58c" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/InvestmentSecuritiesTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/MedicarePartD" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/MedicarePartDDetails" xlink:type="extended">
    <link:loc xlink:href="hum-20200331.xsd#hum_NetAssetLiability" xlink:label="loc_hum_NetAssetLiability_e8fb6b58-1e29-eff2-25a5-cf91fb150ecf" xlink:type="locator" />
    <link:loc xlink:href="hum-20200331.xsd#hum_NetCurrentLiabilityAsset" xlink:label="loc_hum_NetCurrentLiabilityAsset_d43096ae-2b4f-78f5-0b1a-cf91fa79beb7" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_hum_NetAssetLiability_e8fb6b58-1e29-eff2-25a5-cf91fb150ecf" xlink:to="loc_hum_NetCurrentLiabilityAsset_d43096ae-2b4f-78f5-0b1a-cf91fa79beb7" 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="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_hum_NetCurrentLiabilityAsset_d43096ae-2b4f-78f5-0b1a-cf91fa79beb7" 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_AccountsPayableAndAccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_9a34fc5e-00bc-420c-8698-6e19b92b8e39" xlink:type="locator" />
    <link:calculationArc order="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_hum_NetCurrentLiabilityAsset_d43096ae-2b4f-78f5-0b1a-cf91fa79beb7" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_9a34fc5e-00bc-420c-8698-6e19b92b8e39" xlink:type="arc" />
    <link:loc xlink:href="hum-20200331.xsd#hum_NetNoncurrentAssetLiability" xlink:label="loc_hum_NetNoncurrentAssetLiability_6623a650-51fe-5337-3c4f-cf91fb1e7da8" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_hum_NetAssetLiability_e8fb6b58-1e29-eff2-25a5-cf91fb150ecf" xlink:to="loc_hum_NetNoncurrentAssetLiability_6623a650-51fe-5337-3c4f-cf91fb1e7da8" 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="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_hum_NetNoncurrentAssetLiability_6623a650-51fe-5337-3c4f-cf91fb1e7da8" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_bd8545de-cfc2-6f31-bff6-ed0d4012c357" 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="2" weight="-1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_hum_NetNoncurrentAssetLiability_6623a650-51fe-5337-3c4f-cf91fb1e7da8" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_8c850143-cd0c-0f85-9038-e19d8c4f7808" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/MedicarePartDTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/RecentlyIssuedAccountingPronouncements" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/RecentlyIssuedAccountingPronouncementsPolicies" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/SegmentInformation" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/SegmentInformationNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/SegmentInformationSegmentResultsDetails" xlink:type="extended">
    <link:loc xlink:href="hum-20200331.xsd#hum_RevenuesPremiumsAndServiceExternal" xlink:label="loc_hum_RevenuesPremiumsAndServiceExternal_3CCB7CCC2D35CEFBCA0606328296AC68" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PremiumsEarnedNet" xlink:label="loc_us-gaap_PremiumsEarnedNet_88dba276-a88f-9f62-bf2f-2675783c9e0a" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_hum_RevenuesPremiumsAndServiceExternal_3CCB7CCC2D35CEFBCA0606328296AC68" xlink:to="loc_us-gaap_PremiumsEarnedNet_88dba276-a88f-9f62-bf2f-2675783c9e0a" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_ee6f6897-b14b-45ca-c6e4-4fc17aaf1e37" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_hum_RevenuesPremiumsAndServiceExternal_3CCB7CCC2D35CEFBCA0606328296AC68" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_ee6f6897-b14b-45ca-c6e4-4fc17aaf1e37" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_489b61b6-7c39-240c-7f68-1c1675bca3b7" xlink:type="locator" />
    <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_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_489b61b6-7c39-240c-7f68-1c1675bca3b7" 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_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_86dec120-3352-31c8-fc61-55992f948bdd" xlink:type="locator" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_489b61b6-7c39-240c-7f68-1c1675bca3b7" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_86dec120-3352-31c8-fc61-55992f948bdd" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_425ada39-f194-a279-47ac-dd09cf899fb1" xlink:type="locator" />
    <link:calculationArc order="1" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_425ada39-f194-a279-47ac-dd09cf899fb1" xlink:to="loc_us-gaap_PremiumsEarnedNet_88dba276-a88f-9f62-bf2f-2675783c9e0a" xlink:type="arc" />
    <link:calculationArc order="2" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_425ada39-f194-a279-47ac-dd09cf899fb1" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_ee6f6897-b14b-45ca-c6e4-4fc17aaf1e37" xlink:type="arc" />
    <link:loc xlink:href="hum-20200331.xsd#hum_RevenuesIntersegment" xlink:label="loc_hum_RevenuesIntersegment_69F9243EAA4555A9EB630629662AC634" xlink:type="locator" />
    <link:calculationArc order="3" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_425ada39-f194-a279-47ac-dd09cf899fb1" xlink:to="loc_hum_RevenuesIntersegment_69F9243EAA4555A9EB630629662AC634" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InvestmentIncomeInterestAndDividend" xlink:label="loc_us-gaap_InvestmentIncomeInterestAndDividend_8bf33cd8-6d81-d18c-6aee-0dd114eb97b4" xlink:type="locator" />
    <link:calculationArc order="4" weight="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Revenues_425ada39-f194-a279-47ac-dd09cf899fb1" xlink:to="loc_us-gaap_InvestmentIncomeInterestAndDividend_8bf33cd8-6d81-d18c-6aee-0dd114eb97b4" xlink:type="arc" />
  </link:calculationLink>
  <link:calculationLink xlink:role="http://www.humana.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/StockholdersEquity" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/StockholdersEquityNarrativeDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/StockholdersEquityScheduleOfDetailsOfDividendPaymentsDetails" xlink:type="extended" />
  <link:calculationLink xlink:role="http://www.humana.com/role/StockholdersEquityTables" xlink:type="extended" />
</link:linkbase>
