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Interest Rate Calculator

Solve for the nonnegative nominal APR implied by principal, monthly payment and term.

How It Works

Solve principal=payment×[1−(1+r)^−n]/r, then APR=12r×100. Equal month-end payments, no fees.

Reference Sources

FAQs

How does this calculator work?

Solve principal=payment×[1−(1+r)^−n]/r, then APR=12r×100. Equal month-end payments, no fees.

What assumptions should I check?

Check the units and definitions shown beside each input. Results use the values you enter.