Model your adjustable-rate mortgage (ARM) payments from the initial fixed period through future rate resets. Enter your index, margin, and cap structure to visualize potential payment changes across the life of the loan.

How This ARM Calculator Works

This tool models an adjustable-rate mortgage by combining your initial fixed rate and period with a fully indexed rate (index + margin) at each reset, while honoring your initial, periodic, and lifetime caps. It estimates the new payment at each adjustment using the remaining balance and remaining term.

• Index: A benchmark (e.g., SOFR) that moves with market conditions.
• Margin: A fixed add-on set by the lender.
• Caps: Limits on how much your rate can rise at the first reset, at later resets, and over the life of the loan.

Disclaimer: Calculations are estimates for education only. Actual ARM terms and adjustments vary by lender and note. Check your loan documents for precise index, margin, rounding, floors/ceilings, and cap structures.