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Home › Money & Finance › Extra Payment Calculator

Extra Payment Calculator

By the CalcMundi team · Updated October 22, 2026 · Formulas checked against standard financial math

Thinking of putting a bonus or an extra $100 a month toward your mortgage? See the interest you save and how many payments disappear.

Shorter term or lower payment?

Extra principal payments usually shorten the term, which saves the most interest. Some lenders also offer a recast, which lowers the monthly payment instead.

Example

A $250,000 balance at 6.5% with 300 months left: a one-time $10,000 payment cuts 27 payments and saves about $36,982 in interest.

Frequently asked questions

Is there a prepayment penalty?

Most US mortgages today have none, but check your loan documents.

See also

Add this calculator to your website

Free for blogs, real estate agents, brokers and any site. Paste this code where you want the calculator to appear. It adjusts its height on its own.

Results are estimates for information only and are not financial, legal or medical advice. Rates, taxes and fees vary — confirm with a professional or your lender.