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Mortgage Calculator (Monthly Payment)

Estimate your monthly mortgage payment — principal, interest, taxes and insurance — with an amortization schedule.

100% free No sign-up Private · runs in your browser

How to use the free online mortgage calculator

  1. Enter the home price and down payment.
  2. Set the interest rate and loan term.
  3. Optionally add taxes, insurance and HOA estimates.
  4. See your monthly payment and full amortization schedule.

About this tool

Estimate monthly mortgage payments with principal and interest, taxes and insurance. Enter loan amount, term, rate and see the full amortization schedule — how much goes to principal versus interest each month and over the life of the loan. Compare 15 vs 30 year terms and check how a slightly better rate changes the total cost.

Key features

Privacy first: every calculation and generation runs 100% locally in your web browser using the Web Crypto API. Your input never touches a server — nothing is stored, logged or sold.

Read the guide

Frequently asked questions

We use the standard amortization formula: M = P[r(1+r)^n] / [(1+r)^n − 1], where P is the loan amount, r the monthly rate and n the number of payments.
Principal, Interest, Taxes and Insurance — the four components of a typical mortgage payment. We estimate property tax and insurance from common percentages.
HOA fees can add hundreds per month. We include them in the optional costs field so your estimate is realistic.
Extra principal payments shorten the loan term and reduce total interest dramatically. Your amortization schedule shows the standard case.

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