How often does an ARM rate adjust?

After the fixed introductory period (3, 5, 7, or 10 years), most ARMs reset every 12 months. The new rate is your loan's margin plus the current index rate (typically SOFR).

Should I refinance my ARM to a fixed-rate mortgage?

If your ARM is about to reset to a much higher rate and you plan to stay in your home, refinancing to a fixed rate may reduce long-term uncertainty. Calculate your break-even point: closing costs divided by monthly savings.

📊ARM Rate Change Calculator

Q: Are there limits on how much my ARM rate can increase?

Yes. Most ARMs have a periodic cap (typically 2%) limiting how much the rate can change at each adjustment, and a lifetime cap (typically 5–6%) capping the total increase over the loan's life.

Calculate how an interest rate change on your adjustable-rate mortgage affects your monthly payment.

Remaining Loan Balance ($)

Current Interest Rate (%)

New Interest Rate After Adjustment (%)

Remaining Loan Term (years)

ARM Rate Change Calculator — How It Works

Adjustable-rate mortgages (ARMs) reset periodically — typically every 1, 3, 5, or 7 years after the fixed introductory period. When your rate adjusts, your monthly payment changes based on the new index rate plus your margin.

This calculator shows you exactly how much your monthly payment will increase or decrease when your ARM resets. Enter your current balance, old and new rates, and remaining term to see the dollar impact of each rate adjustment.

Frequently Asked Questions

How much can my ARM rate increase at one adjustment?

Most ARMs have rate caps: a periodic cap (typically 2%) limits how much the rate can change at each adjustment, and a lifetime cap (typically 5–6%) limits total increases over the life of the loan. Check your loan documents for your specific caps.

Should I refinance to a fixed rate before my ARM resets?

If rates have risen significantly above your current ARM rate, refinancing to a fixed rate may make sense for payment stability. Compare your break-even point (closing costs ÷ monthly savings) against how long you plan to stay in the home.

What index do most ARMs use?

Most modern US ARMs use the Secured Overnight Financing Rate (SOFR), which replaced LIBOR. Older ARMs may still reference the 1-year Treasury or COFI. Your rate = index + your loan's margin (typically 2.25–2.75%).

ARM Rate Change Calculator — How It Works

Frequently Asked Questions

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