US home finance
US mortgage payment calculator: estimate the full monthly cost
Learn how a US mortgage payment calculator combines principal, interest, property taxes, and homeowners insurance.
Updated August 27, 2026 · 5 min read
Separate principal and interest from the full payment
The principal and interest payment is based on the amount borrowed, the interest rate, and the loan term. A larger down payment reduces the amount borrowed, while a longer term can reduce the monthly payment and increase total interest.
A mortgage calculator is most useful when you keep these figures visible instead of treating one monthly number as the entire cost of owning a home.
Add property taxes and homeowners insurance
A total monthly mortgage payment may also include property taxes and homeowners insurance, often collected through an escrow account. These costs vary by property and location and can change over time.
The calculator accepts an annual property-tax rate and insurance estimate so you can create a more realistic scenario. Mortgage insurance, HOA dues, maintenance, and utilities are separate costs to consider.
Use the written Loan Estimate for the final comparison
When you apply for a mortgage, compare the lender's Loan Estimate for the interest rate, projected payments, closing costs, cash to close, mortgage insurance, and rate-lock details.
Use the calculator to test scenarios before or alongside the lender documents. It is not an approval offer and cannot predict every property-specific charge.
Put this guide into practice
Use the related calculators
Put the steps in this guide into practice with a focused calculator, then return here to check an assumption or compare another scenario.
Sources and further reading
Consumer Financial Protection Bureau: Mortgage payments
Official explanation of principal, interest, taxes, and homeowners insurance in a mortgage payment.
Consumer Financial Protection Bureau: Loan Estimate
Official guide to checking projected payments, mortgage insurance, closing costs, and other written loan terms.