Is the Mortgage Extra Payment Calculator free?

Yes. It is free to use in your browser and does not require an account.

Is this a lender quote?

No. It is an educational estimate. Actual lender offers, escrow costs, PMI and fees can vary.

Does this include every housing cost?

Only the costs shown in the calculator inputs are included. Review lender documents, insurance quotes and local tax data before making decisions.

Mortgage Extra Payment Calculator

Extra payment payoff guide

Extra principal payments reduce the balance earlier, so future interest is charged on a smaller amount. The effect is strongest when extra payments are made early.

Worked example

Adding $200 per month to a mortgage can shorten the payoff timeline and reduce lifetime interest. A one-time payment now is modeled as reducing the starting balance.

Methodology

The calculator compares the scheduled amortization path with a second path that includes entered monthly and one-time extra principal payments.

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Sources and review

Last reviewed: August 16, 2026.

Frequently asked questions

Is this professional mortgage advice?

No. DailyToolDesk provides educational estimates, not lending, tax, legal or investment advice.

Why can lender numbers differ?

APR, points, escrow rules, insurance quotes, property tax, PMI, lender fees and closing timing can change actual results.

Which tool should I use next?

Use the related calculator that matches the next decision: amortization for schedules, extra payment for payoff acceleration, PMI for insurance cost, or rent vs buy for housing path comparison.