Calculator

Extra Mortgage Payment Calculator

Estimate annual extra principal created by a recurring extra payment.

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

Extra Mortgage Payment formulaAnnual extra principal = monthly extra × 12

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Using the default example values, the calculator substitutes 250 and 12 into the formula. Change the values to model your own scenario.

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  • The values entered for extra principal per month and months paid per year 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.