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Loan Refinance Comparator
Compare remaining fixed-rate loan costs with a replacement loan and explicit fees.
Outstanding principal, Current nominal annual rate (%), Current remaining months, New nominal annual rate (%), New term (months), Refinancing fees, Pay fees
JSON
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the labelled values using the displayed units and explicit assumptions.
- Choose Calculate result and review the complete report and any undefined or no-solution states.
- Choose Download result to save the complete JSON. Reset clears the result and restores example controls.
Examples
Outstanding principal: 150000
Current nominal annual rate (%): 6.5
Current remaining months: 240
New nominal annual rate (%): 5
New term (months): 240
Refinancing fees: 3000
Pay fees: upfront
Limitations
- Same outstanding principal,no cash-out. Rates0–100%,terms1–1200months. Fees paid upfront or financed. Full schedules and monthly cumulative outlay difference through longer term;first nonnegative outlay difference is cash-flow break-even,not economic profitability. No taxes,penalties,opportunity cost or recommendation. The reused amortization model supports each resulting loan principal up to1e12,including financed fees.
- Scalar controls accept explicit finite decimal syntax;positive values normally1e-12–1e12,nonnegative0–1e12 unless a narrower range is stated. JSON numeric rows use finite IEEE754 values within their stated bounds. Derived counts above1billion and nonfinite results refuse. Combined input<=400000UTF8 bytes;complete JSON<=4MiB. All processing stays in your browser.
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