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Mortgage Calculator

See your monthly payment, total interest, and the payoff effect of paying extra.

mortgage-calculator.local
$
$
% APR
$
Monthly payment (principal + interest)
$2,271/mo
Loan amount
$400k
Total interest
$418k
Total of payments
$818k
Payoff time
30 yr
Balance over timestandard

Overview

Estimates your monthly mortgage payment from the loan amount, interest rate, and term, so you can see what a given home loan would cost each month. It helps you compare scenarios before committing.

How it works

The calculator uses the standard amortized loan formula. Your monthly payment equals the principal times the monthly interest rate times one plus that rate raised to the number of payments, divided by that same quantity minus one. The monthly rate is the annual rate divided by 12, and the number of payments is the loan term in years times 12. Early payments go mostly toward interest, and more goes toward principal over time. These figures are estimates for planning, not a loan offer.

How to use it

  1. Enter the loan amount.
  2. Enter the annual interest rate.
  3. Enter the loan term in years.
  4. Read your estimated monthly payment.

Examples

30 year loan

A 300,000 loan at 6 percent over 30 years works out to a principal-and-interest payment of about 1,799 a month.

Comparing rates

Re-run the same loan at a different rate to see how much the monthly payment and total interest change.

FAQ

Does this include taxes and insurance?
The calculation covers principal and interest. Property tax, insurance, and PMI are separate costs not included here.
Why is so much early payment interest?
Interest is charged on the remaining balance, which is highest at the start, so early payments are interest-heavy and shift toward principal over time.
How does the term affect cost?
A longer term lowers the monthly payment but usually raises the total interest paid over the life of the loan.
Is this a loan offer?
No. It is an estimate for planning. Actual terms depend on your lender and circumstances.
Is my data stored?
No. The calculation runs in your browser.

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Embed this tool

Paste this snippet to put the tool on your own site. It runs entirely in the visitor's browser, the same as it does here.

<iframe src="https://tooldok.com/embed/mortgage-calculator/" title="Mortgage Calculator by Tooldok" width="100%" height="560" style="border:1px solid #16130d;border-radius:16px;max-width:720px" loading="lazy"></iframe> <p style="font:13px sans-serif"><a href="https://tooldok.com/tools/mortgage-calculator/" target="_blank" rel="noopener">Mortgage Calculator</a> by <a href="https://tooldok.com/" target="_blank" rel="noopener">Tooldok</a></p>