Current monthly
$0
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Refinance Calculator
Is refinancing worth it? Enter your current loan and new offer to see monthly savings, total interest saved, and your break-even month.
Current loan
New loan offer
$0/month
Monthly savings
New monthly
$0
Total interest saved
$0
Break-even
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How refinancing math works
Refinancing replaces your existing loan with a new one. You save money when the total cost of the new loan (interest + closing costs) is less than the remaining interest you'd pay on the old loan. The break-even point tells you how long it takes to recoup closing costs from monthly savings.
Rule of thumb: refinance if you can lower your rate by 1% or more AND you plan to keep the loan past the break-even point.
Last updated
How to verify this calculator
- Last verified
- — the calculation logic and the automated regression suite were re-run on this date. Fee and rate fields are editable estimates; confirm current values against the official schedule before relying on them.
- Official / methodology source
- No platform fee schedule applies to this calculator. Its formula is documented in the project source and exercised by the regression suite linked below.
- Method & testing
- All arithmetic runs locally in your browser — no input is uploaded. Calculation behaviour is exercised by the repository's regression suite: 39/39 checks passed (run 2026-11-08). Source & tests on GitHub.
- Maintained by
- Jim (Maoming, Guangdong, China) · eyetoolkit. Report a wrong result through the contact page.
- Changelog
- 2026-11-08 — Added this verification panel (last verified date, official or methodology source, test coverage, named maintainer, changelog). Calculator logic and default rates are unchanged.