Mortgage Payment Calculator

How to Use This Mortgage Payment Calculator

Enter your home price (or loan amount), down payment, annual interest rate, and loan term. Optionally add property tax, home insurance, and PMI for a complete monthly payment estimate. Hit Calculate to instantly see your monthly payment, total interest, and a full year-by-year amortization schedule.

Why This Matters

Your mortgage payment is likely the largest monthly expense you'll have, so even a small difference in interest rate or loan term can mean tens of thousands of dollars over the life of the loan. For example, on a $350,000 home with 20% down at 6.5% over 30 years, you'll pay roughly $282,000 in interest — nearly the cost of the home again. Dropping the rate to 5.5% saves about $48,000 over 30 years.

First-time buyers often focus only on the P&I payment and forget about property taxes and insurance, which can add $400–$800+ per month depending on location. This calculator shows the true "all-in" monthly cost so there are no surprises at closing.

Choosing a 15-year vs. 30-year term is one of the biggest decisions. A 15-year mortgage on the same $280,000 principal at 6.5% saves over $170,000 in interest, though the monthly payment is about $600 higher — something to weigh carefully against your budget and investment goals.

How It's Calculated

The monthly principal & interest payment uses the standard amortization formula:

M = P × [r(1+r)ⁿ] / [(1+r)ⁿ − 1]

Where P = principal (home price minus down payment), r = monthly interest rate (annual rate ÷ 12), and n = total number of payments (years × 12). Property tax, insurance, and PMI are divided by 12 and added to the P&I payment to get the total monthly estimate.

Tips & Common Mistakes

• Don't ignore escrow costs. Property tax and insurance can add 15–25% to your base P&I payment, making a "affordable" payment suddenly stretch your budget.
• PMI disappears at 20% equity. If you put down less than 20%, you'll pay PMI (~0.5–1% of the loan annually) until your balance drops below 80% of the home's value — usually 7–11 years.
• Extra payments matter enormously. Paying just $200 extra per month on a $280,000, 30-year loan at 6.5% shaves about 5 years off your term and saves ~$70,000 in interest.
• Rate shopping is worth it. A 0.5% lower rate on a $300,000 loan saves over $30,000 over 30 years. Always get at least 3 quotes.
• Pre-approval ≠ affordability. Lenders may approve you for more than is comfortable. Use the 28% rule: keep your total housing payment under 28% of gross monthly income.

Frequently Asked Questions

What's included in a monthly mortgage payment?

A full mortgage payment typically includes four components, often called PITI: Principal, Interest, Taxes (property), and Insurance (homeowners + PMI if applicable). This calculator includes all four so you can see your real monthly obligation, not just the bank's P&I quote.

Should I choose a 15-year or 30-year mortgage?

A 15-year mortgage saves a significant amount in total interest and builds equity faster, but the monthly payment is 30–50% higher. Choose 15 years if you can comfortably handle the higher payment and prioritize debt-free ownership. Choose 30 years if you need cash flow flexibility or plan to invest the difference — stock market returns have historically outpaced mortgage interest rates over long periods.

How does my down payment affect my monthly payment?

A larger down payment reduces your loan principal, directly lowering your P&I payment. It also helps you avoid PMI (private mortgage insurance) if you put down 20% or more. On a $400,000 home, going from 10% down ($40K) to 20% ($80K) saves roughly $180/month in P&I plus eliminates ~$167/month in PMI — a combined $350+/month difference.

Does this calculator account for extra payments or refinancing?

This calculator shows the standard fixed-payment schedule. It doesn't model extra payments or refinancing scenarios. For extra payment analysis, use our Debt Payoff Calculator. For a rent vs. buy comparison, see our Rent vs. Buy Calculator.