A mortgage is repaid in equal monthly payments, but the split inside each payment changes over time. At the start, most of your money goes to interest; near the end, almost all of it pays down the balance. This calculator shows the monthly payment and the full year-by-year picture.

How to read the chart

Each bar is one year of payments. The shaded top is interest; the solid part below is principal. Watch interest shrink and principal grow as the years pass — that shift is amortization, and it's why paying a little extra early saves so much.

An example

A $300,000 home with 20% down ($60,000) leaves a $240,000 loan. At 6% over 30 years, the monthly principal and interest is about $1,439, and you pay roughly $278,000 in interest across the life of the loan — more than the home's down payment many times over.

Good to know

This shows principal and interest only. Property tax, home insurance, and HOA fees are added on top and vary by location.
The rate is fixed for the whole term in this estimate.
Extra payments and refinancing can change the picture a lot.

This tool is for education, not financial advice.