Adjustable-Rate Mortgage (ARM) Calculator
Estimate your initial and worst-case monthly payment on an adjustable-rate mortgage.
Assumptions used in this calculation
- Worst-case adjustment: The worst-case payment assumes the rate jumps straight to the lifetime cap at the first adjustment, actual ARMs usually also cap how much the rate can move per adjustment period.
About this calculator
Estimate your monthly payment on an adjustable-rate mortgage (ARM) during its fixed initial period, and the worst-case payment if the rate rises to its lifetime cap after that period ends.
Worked example
$400,000 loan, 6% initial rate, 5-year fixed period, 30-year term, 5% lifetime cap
Result: Initial payment ≈ $2,398, worst-case ≈ $3,467 at 11%
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