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Interest Rate Calculator – Solves for the interest rate implied by a loan'...

The Interest Rate Calculator solves for the interest rate implied by a loan's payment, principal, and term. This free Interest Rate Calculator gives you an instant, accurate result without requiring an account, spreadsheet, or financial expertise. Enter your numbers and see exactly what the formula produces.

The formula behind this calculator: Iteratively solves the loan payment formula for r given known payment, principal, and number of periods. As a practical example: A $10,000 loan paid at $220/month for 5 years implies a rate near 8.5%. All results are calculated instantly in your browser — no data is stored or transmitted.

Interest Rate Calculator FAQ

What does the Interest Rate Calculator calculate?

Solves for the interest rate implied by a loan's payment, principal, and term.

Is the result an exact figure I can give to a lender?

No — it's an estimate based on the inputs provided. Actual loan terms, rates, and fees from a lender may differ. Use this to understand the range and compare options before applying.

Does this account for inflation over time?

Only where specifically noted. Most financial calculators use nominal (not inflation-adjusted) figures unless an inflation rate field is provided.

Is my data sent to a server?

No — calculations run directly in your browser. Your inputs are not stored or transmitted.