Mortgage Calculator
Calculate your monthly mortgage payments, total interest, and total cost.
About the Mortgage Calculator
This mortgage calculator uses the standard fixed-rate amortization formula — the same one banks use to determine your monthly payment — to break down principal and interest for any loan amount, interest rate, and term. The full amortization schedule shows exactly how much of each monthly payment goes to interest versus principal, so you can see the real cost of a 30-year vs. 15-year loan or model the impact of an extra principal payment. Calculations run in your browser; nothing is logged, and you'll never be asked for your name, email, or zip code.
What people use it for
- Compare 15-year vs. 30-year mortgage scenarios
- Estimate monthly payment before making an offer
- Model the savings of an extra annual principal payment
- Stress-test affordability against rising interest rates
- Compare total interest paid across multiple loan offers
Private by design
Everything you type here is processed inside your browser. Nothing is sent to a server, logged or stored, so it is safe to use with real numbers, drafts and anything you would not paste into a hosted tool.
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Questions people ask
How do I calculate my monthly mortgage payment?
Enter your loan amount, annual interest rate, and loan term in years. The calculator instantly shows your monthly payment, total interest, and total cost.
What is included in a mortgage payment?
A basic mortgage payment includes principal and interest. This calculator focuses on these components. Property taxes, homeowner's insurance, and PMI are additional costs to consider.
How accurate is this mortgage calculator?
The calculator uses the standard amortization formula used by banks and lenders. Results are accurate for fixed-rate mortgage estimates.