Mortgage Calculator

A mortgage is the largest loan most people ever take, and small differences in rate or term translate into tens of thousands of dollars over its life. Knowing your monthly payment before you talk to a lender — and seeing how much of it is interest — turns an intimidating decision into a comparison you can actually reason about.

This calculator takes your loan amount, annual interest rate, and term in years and returns the monthly principal-and-interest payment, the total amount you'll pay over the full term, and the total interest. It also generates a complete amortization schedule, so you can watch the balance fall and see the point at which your payments start going mostly to principal instead of interest.

Use it to test scenarios: a larger down payment (smaller loan amount), a shorter term, or a lower rate, and see immediately how each changes the monthly cost and the lifetime interest. All calculations happen in your browser — nothing you enter is uploaded.