Calculator

Interest Rate Calculator

Find a simple annual interest rate from principal, interest and time.

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This calculator applies the displayed finance formula directly to your inputs. It keeps full precision during the calculation and rounds only the displayed result.

Interest Rate formulaRate = interest ÷ principal ÷ years × 100

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Using the default example values, the calculator substitutes 10,000 and 1,500 plus 3 into the formula. Change the values to model your own scenario.

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  • The values entered for principal and interest paid are accurate for the scenario.
  • Rates and recurring amounts remain constant for the period represented by the formula.
  • Provider fees, taxes and timing differences are excluded unless they are explicit inputs.