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FREE AUTOMOTIVE CALCULATOR • Buying & finance

Loan APR From Monthly Payment

Reverse-estimate a loan’s nominal annual interest rate using principal, monthly payment and term.

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Enter your assumptions above and calculate locally in this browser. No data is uploaded.

How this calculator works

Solve the level-payment annuity equation using a bounded numeric root search.

Important: The result is a nominal APR approximation excluding fees, insurance and payment timing; lender APR disclosures may differ.

These are planning estimates, not official recall records, a professional valuation, a certified inspection, or financial/legal advice.

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