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Interest-Only ARM Calculator

Enter your interest-only ARM

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Most interest-only ARMs stop the interest-only payments when the rate first adjusts.

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Use a negative number if you expect rates to fall.

Rate caps and floor
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Payment shock at the recast

Interest-only payment

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Payment after the recast

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Increase

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First full payment–
Balance still owed at the recast–
Fully indexed rate today–
Recast payment if the first cap is hit–
Increase in that case–
Highest possible payment under the caps–
Total interest, expected path–
Total interest, worst case–

Plan for the jump

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Year-by-year schedule

Expected path: the rate and payment at the end of each year, with the payment if every adjustment hits its cap alongside.

YearRateMonthly paymentInterestPrincipalBalanceWorst-case payment

Results are estimates for educational purposes and are not financial, tax or legal advice.

See what an interest-only adjustable-rate mortgage costs while you pay interest only, and how far the payment jumps when principal repayments start and the rate adjusts. It shows the expected recast payment and the worst case under the caps. The amortization calculator uses the same plain-English approach, so you can compare results side by side.