ARM Mortgage Calculator
v1.3Estimate initial and reset payments on an adjustable-rate mortgage.
Last updated · Last reviewed
Inputs
e.g. 60 for a 5/1 ARM, 84 for a 7/1 ARM.
Maximum rate rise at the first reset (commonly 2%).
Result
Initial Payment
$2,271.16
Fixed at 5.5% for 60 months
Saved calculations remain on this device unless you choose to share them. No tracking, no account needed.
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Formula
Reset rate = min(index + margin, initial + cap). Payment recalculated on remaining balance over remaining term.
How it works
Estimate initial and reset payments on an adjustable-rate mortgage.
Example
Example: 5/1 ARM at 5.5% resetting into ~7.5%.
Official Sources & References
The formulas, rates and definitions used by this calculator are aligned with the following official sources:
- Consumer Financial Protection Bureau (CFPB) — U.S. consumer lending, APR and mortgage disclosure rules.
- Reserve Bank of India — Loan & EMI norms — Lender computation guidance and base/repo-linked rate rules.
- Federal Reserve — Regulation Z (Truth in Lending) — Statutory definition of APR and amortisation disclosure.
We use only primary sources — regulators, standards bodies and scheme operators. See our full sourcing policy for details. Sources & References Policy · Calculator Methodology · How We Verify Formulas
Trust & Accuracy
Formula verified
Verified against standard amortisation & Truth-in-Lending (Reg Z) conventions.
Last reviewed
June 27, 2026
Accuracy tested
Edge cases tested, formula validation and manual verification completed.
Available for
United States, Canada, United Kingdom, Australia, India, European Union.
Currency support
USD · INR · CAD · AUD · GBP · EUR
Privacy
No information entered into this calculator is stored on our servers unless you explicitly choose to save or share your calculation.
Print, share & save
Use the Save, Share, Copy, PDF, CSV and Print actions under the result panel.
Accessibility
Keyboard navigable, screen-reader friendly labels, responsive on mobile and desktop.
Learn more: How we verify formulas · How we test accuracy · Methodology · Editorial policy
Recent Updates
We continuously review and improve our calculators to keep formulas, assumptions and references accurate.
View change log (4)Show
- v1.3
Added Trust & Accuracy panel and machine-readable change log.
- v1.2
Added Save, Share, PDF, CSV and Print actions to results.
- v1.1
Added global currency selector (USD, INR, CAD, AUD, GBP, EUR).
- v1.0
Initial calculator release with verified formulas and Official Sources.
Frequently Asked Questions
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