Loan & Mortgage Calculator — monthly payment
Calculate the monthly payment, total interest and total cost of a loan or mortgage — in your browser.
🔒 Runs entirely in your browser. Your input and output are never sent to a server or stored — fully private.
For estimation only — not financial advice.
About this tool
This loan calculator estimates the monthly payment on a mortgage, car loan or personal loan, along with the total interest and the overall cost over the full term. Enter the amount borrowed, the annual interest rate and the number of years, and it builds an amortized schedule where every payment is identical. It is useful when comparing offers, testing different down payments or seeing how a shorter term cuts interest. Everything is calculated locally in your browser, so the figures you enter are never uploaded.
Frequently asked questions
How is the monthly payment worked out?
The tool uses the standard amortization formula, A = P·r·(1+r)^n ÷ ((1+r)^n − 1), where P is the amount borrowed, r is the monthly interest rate (the annual rate divided by 12) and n is the total number of monthly payments. Early payments go mostly toward interest and later ones mostly toward principal, yet the payment amount stays the same every month.
Does this include taxes, insurance or fees?
No. The result covers only principal and interest, so a real mortgage payment may be higher once property tax, home insurance or lender fees are added, and a rate can be variable rather than fixed. Treat the numbers as an educational estimate for comparison, not financial advice, and ask your bank or lender for an official quote before you commit.
Are the numbers I enter kept private?
Yes. The entire amortization runs in your browser using plain JavaScript, so the loan amount, rate and term you type are never sent to or stored on any server. You can even use the calculator offline once the page has loaded, and nothing about your finances leaves your device.