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Mortgage Payoff Calculator

See how adding extra to your monthly mortgage payment shortens your loan and slashes total interest. Enter your remaining balance, rate, years left, and an extra monthly amount to see your new payoff date and savings.

Formula reviewed for accuracy. Our methodology & sources

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Mortgage Payoff Calculator

mortgage calculator

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How It Works

First the calculator works out your normal principal-and-interest payment from your balance, rate, and years left. It then adds your extra amount on top and simulates the loan month by month: each month interest is charged on the remaining balance and the larger payment chips away at the principal. Because every extra dollar goes straight to principal, it stops accruing interest for the entire rest of the loan — which is why a modest extra payment can cut years off the term and save tens of thousands in interest.

Formula

New payment = Base P&I + Extra. The calculator amortizes the balance with the higher payment until it reaches zero.
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Examples

$280K balance, 6.5%, 27 yrs left, +$200/mo

Pays off several years early and saves tens of thousands in interest.

Frequently Asked Questions

Is it worth paying extra on my mortgage?

If you have no higher-interest debt and a solid emergency fund, yes — extra principal payments deliver a guaranteed return equal to your mortgage rate and can save tens of thousands in interest.

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Should I pay extra or invest instead?

If your expected investment return exceeds your mortgage rate, investing may build more wealth. But paying down the mortgage is a guaranteed, risk-free return and reduces financial stress. Many people do a mix.

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