Mortgage Extra Payment Calculator
Shows the interest and time saved by adding extra repayments to your mortgage, and the new payoff date.
Enter Values
Before you rely on this: Estimates only — not financial, tax or legal advice. Confirm current rates, fees and rules before relying on these figures.
How to use this calculator
- Enter the loan amount, rate, term and an extra monthly payment.
- Read the interest and time saved.
How it works
Computes the scheduled payment, then re-runs the amortisation with your extra payment added and compares the two.
Worked example
$500k, 6%, 30 yr, +$200/mo. Saves years off the loan and tens of thousands in interest.
Tips
- Estimate only — not financial advice.
Frequently asked questions
Are extra payments worth it?
Early extra payments save the most because more of each early payment is interest.
Privacy?
Runs entirely in your browser. Your inputs are not saved or transmitted.
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Cite this tool
Zerdly. (2026). Mortgage Extra Payment Calculator. Retrieved from https://www.zerdly.com/tools/mortgage-extra-payment-calculator/
Tip: Enter any known values to calculate the remaining results.
Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.