About the Mortgage Calculator
Definition, formula, worked example, assumptions, interpretation, FAQs, and related mortgage & homebuying tools
How to use
- Enter the required inputs: amount, interest rate, term, fees, extra payments.
- Review the outputs: payment, total interest, payoff date, schedule.
- Adjust the assumptions to compare scenarios.
- Read the guide below for the formula and worked examples.
Frequently asked questions
What is the mortgage calculator?
The Mortgage Calculator is a free online tool that helps you calculate using amount, interest rate, term, fees, extra payments. It returns payment, total interest, payoff date, schedule instantly, with no signup required.
How accurate is the mortgage calculator?
The Mortgage Calculator uses widely accepted formulas and returns mathematically exact results for the inputs you provide. Real-world outcomes may vary depending on rounding, taxes, fees, regional rules, or other factors specific to your situation.
Is the mortgage calculator free to use?
Yes. Every calculator on WOW Online Calculators is 100% free, works in your browser, and does not store your inputs.
Which countries does the mortgage calculator work in?
The tool is designed for a Global / localizable audience. You can change currencies, units, and locale-specific values in the inputs where relevant.
What data does the mortgage calculator need?
You'll need: Amount, interest rate, term, fees, extra payments. The calculator returns Payment, total interest, payoff date, schedule.