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.