ARM vs Fixed Mortgage Calculator
Compare fixed mortgage payments with ARM intro and adjusted payment scenarios.
- Last reviewed
- July 8, 2026
- Cost
- Free to use
- Data
- Runs in your browser
Fixed Payment
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ARM Initial Payment
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ARM Adjusted Payment
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Intro Period Savings
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Methodology
How this calculator handles inputs
This calculator uses the values you enter above and applies the formula explained in the guide below. Results update in the browser and are intended for quick planning, comparison, and sanity-checking.
- Use consistent periods, currencies, and units across inputs.
- Review any assumptions before using the result in a decision.
- Recalculate when rates, prices, tax rules, or business terms change.
Important note
This tool provides general planning information only. It is not tax, legal, financial, accounting, or investment advice. Check the current rules for your location and speak with a qualified professional before making a high-stakes decision.
Guide
How it works
Use this calculator to compare an adjustable-rate mortgage with a fixed mortgage.
What this calculator does
The ARM vs fixed mortgage calculator compares fixed payment, ARM intro payment, adjusted ARM payment, and intro-period savings.
ARM vs Fixed Formula
The calculator amortizes the ARM during the intro period, then recalculates payment at the adjusted rate.
Example calculation
If a fixed mortgage rate is 6.5% and an ARM starts at 5.5% for 5 years, the calculator estimates intro savings and the adjusted payment.
When to use this calculator
- comparing ARM and fixed offers
- estimating payment reset risk
- reviewing refinance timing
- planning affordability under higher rates
FAQs
Is an ARM always cheaper?
No. It may start cheaper, but payments can rise after the initial fixed period.
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