How much can extra mortgage payments save?

Extra payments reduce principal faster, which cuts interest significantly. Paying $100 extra per month on a 30-year mortgage can shave years off the term and save tens of thousands in interest.

Extra Mortgage Payment Calculator

Estimate mortgage payment acceleration with extra payments.

This tool runs in your browser. None of your data is saved or sold.

Loan amount ($)

Annual rate (%)

Years (years)

Payments per year (years)

Extra payment each period

Extra payment frequency

About This Calculator

Adding extra money to your principal payment each month accelerates payoff and dramatically reduces total interest. This calculator shows how many periods you save and how much interest you avoid by making consistent extra payments.

Estimates only — not financial, tax, legal, or investment advice. Verify important results with a qualified professional before making decisions.

base PMT = P × r / (1 − (1+r)^−N); each period: balance = balance × (1+r) − (PMT + extra); count periods until balance = 0; total paid = sum of all payments; total interest = total paid − P