Calculators

How to Use the Mortgage Calculator

2026-11-124 min readBy Apex Tool Station Team

Calculate your monthly mortgage payment from home price, down payment, rate and term, including tax and insurance.

100% free No signup Works in your browser

1. What is the Mortgage Calculator?

See what a house will cost you each month. The calculator uses the standard amortization formula for the loan after your down payment, then adds yearly property tax and insurance divided by twelve.

2. How to use the Mortgage Calculator

Here is the whole process, step by step. It takes less than a minute from opening the tool to seeing your result.

1Fill in the Home price, Down payment (%), Interest rate (%), Loan term fields.
2Your result updates as you type — read it below the fields, with its breakdown where shown.

Press the "Calculate" button and your result appears on the page.

Everything runs in your browser — your files and text never leave your device.

3. What you can do with it

Run the tool with the "Calculate" button when your input is ready.
Start over any time with the "Reset" button — it clears the tool so you can begin again.

4. Tips for best results

Your text never leaves your device — The tool runs entirely in your browser using JavaScript. Nothing is uploaded, so you can paste private documents without worry. That also means there is no account to create and no file to upload.
It works on your phone too — Open the tool in any modern browser on Android or iPhone. The layout adjusts to the screen and everything works the same way on a small screen as on a desktop.
Read the breakdown, not just the headline number — The result updates as you type. The breakdown underneath shows how the number was worked out, which is where mistakes usually show up.