DocomintMortgage Calculator
Calculate a mortgage's monthly payment and see a year-by-year amortization schedule.
Beyond just the monthly payment, this breaks down the first year of payments into their principal and interest portions — early in a mortgage, most of each payment goes toward interest, not principal, which surprises a lot of first-time buyers looking at their amortization schedule for the first time.
Example: A $350,000 home with a $70,000 down payment (financing $280,000) at 6.5% over 30 years costs $1,769.79/month — in month 1, only $754.79 of that goes toward principal, with the remaining $1,015 going to interest, a split that gradually reverses over the life of the loan.
How it works
- Enter the home price, down payment, annual interest rate, and loan term
- Press Calculate
- The monthly payment, total interest, and a first-year amortization schedule appear instantly, on your device
Frequently asked questions
Why does so little of my early mortgage payment go to principal?
Interest is calculated on the outstanding balance each month, and early in the loan that balance is at its highest — so the interest portion of the payment is largest right away and shrinks gradually as the balance (and therefore the interest charged on it) goes down over the loan's life.
Does this include property tax and homeowners insurance?
No — this calculates principal and interest only (the "P&I" portion of a mortgage payment), not property tax, homeowners insurance, PMI, or HOA fees, which most lenders add into an actual monthly escrow payment.
Is my numbers uploaded anywhere?
No — Mortgage Calculator runs entirely in your browser using JavaScript/WebAssembly. Your numbers is never sent to a server.