<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-01-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000106640</issuerCik>
        <issuerName>WHIRLPOOL CORP /DE/</issuerName>
        <issuerTradingSymbol>WHR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001545393</rptOwnerCik>
            <rptOwnerName>Brega Joao Carlos</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>WHIRLPOOL CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>2000 N. M-63</rptOwnerStreet2>
            <rptOwnerCity>BENTON HARBOR</rptOwnerCity>
            <rptOwnerState>MI</rptOwnerState>
            <rptOwnerZipCode>49022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EXECUTIVE VICE PRESIDENT</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-01-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>7700</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>145.80</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16766</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common</value>
            </securityTitle>
            <transactionDate>
                <value>2020-01-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1300</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>146.45</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>15466</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2082.49</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Mr. Brega's 9,000 shares were sold at an aggregate average price of $145.89 per share -- 7,700 shares were sold at prices ranging from $145.25 to $146.21, inclusive and 1,300 shares were sold at prices ranging from $146.25 to $146.68, inclusive. The reporting person undertakes to provide Whirlpool Corporation, any secuirty holder of Whirlpool Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth.</footnote>
        <footnote id="F2">As of 1/31/2020, the latest date for which information is reasonably available, there are 2,082.499 shares held in the account of the undersigned pursuant to the broker-administered dividend reinvestment plan.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Bridget K. Quinn, Attorney-in-Fact</signatureName>
        <signatureDate>2020-02-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
[{"type": "4", "sequence": "1", "filename": "wf-form4_158084128889108.xml", "description": "FORM 4", "secsgml_size_bytes": 5932}]
X0306
4
2020-01-31
0
0000106640
WHIRLPOOL CORP /DE/
WHR
0001545393
Brega Joao Carlos
WHIRLPOOL CORPORATION
2000 N. M-63
BENTON HARBOR
MI
49022
0
1
0
0
EXECUTIVE VICE PRESIDENT
Common Stock
2020-01-31
4
S
0
7700
145.80
D
16766
D
Common
2020-01-31
4
S
0
1300
146.45
D
15466
D
Common Stock
2082.49
D
Mr. Brega's 9,000 shares were sold at an aggregate average price of $145.89 per share -- 7,700 shares were sold at prices ranging from $145.25 to $146.21, inclusive and 1,300 shares were sold at prices ranging from $146.25 to $146.68, inclusive. The reporting person undertakes to provide Whirlpool Corporation, any secuirty holder of Whirlpool Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth.
As of 1/31/2020, the latest date for which information is reasonably available, there are 2,082.499 shares held in the account of the undersigned pursuant to the broker-administered dividend reinvestment plan.
/s/ Bridget K. Quinn, Attorney-in-Fact
2020-02-04