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Interest Rate Calculator — Free Online Tool
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Interest Rate Calculator

Find the annual interest rate from loan principal, payment, and term

Rate Calculation Formula: Uses iterative numerical root-finding on the amortization formula $PMT = PV \frac{r(1+r)^n}{(1+r)^n - 1}$ to solve for annual interest rate ($r \times 12$). Enter your loan details below.
Loan Parameters Input

Calculation Results

⚠️ Calculated interest rates reflect nominal annual percentage rates (APR); additional loan origination fees can increase effective borrowing costs!

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