Adjustable Rate Mortgage (ARM) Calculator
Calculate ARM payments with rate adjustments, caps, and payment changes over time
About this calculator
This Adjustable Rate Mortgage (ARM) Calculator helps you understand how your mortgage payments will change over time as interest rates adjust. It accounts for initial teaser rates, adjustment periods, rate caps, and payment caps to show you the complete picture of your ARM loan. This tool is essential for comparing ARM options against fixed-rate mortgages and planning your budget for potential payment increases throughout the loan term.
How to use
Enter your loan amount, initial interest rate, and loan term. Input the adjustment period, rate caps, and index margin details. The calculator will show your initial payment and how payments may change at each adjustment period based on rate fluctuations and cap limitations.
Frequently asked questions
What is an ARM adjustment period?
The adjustment period is how often your interest rate can change, typically every 1, 3, 5, or 7 years after the initial fixed period.
How do rate caps protect borrowers?
Rate caps limit how much your interest rate can increase per adjustment period and over the loan's lifetime, preventing extreme payment shock.
Should I choose an ARM over a fixed-rate mortgage?
ARMs work best if you plan to move or refinance before rates adjust, or if you expect rates to decrease.