Loan Calculator
Estimate monthly loan payments and total interest.
Estimates assume a fixed-rate, fully amortized loan with equal monthly payments. Real loans may include fees, insurance, or a different compounding method, so treat this as a guide. Amounts are shown in your own currency — the math is the same whatever the symbol.
Use on any page (bookmarklet)
Want Loan Calculator without leaving the page you're on? Drag the button below to your bookmarks bar, then click it on any website to open Loan Calculator right there — it runs entirely in your browser.
Use responsibly: a bookmarklet runs on whatever page you click it on. Avoid sensitive sites such as online banking, payment, or healthcare pages — you run it at your own risk. Everything is processed locally and no data is sent anywhere. See our Terms.
- Show your bookmarks bar if it's hidden — Ctrl+Shift+B (⌘+Shift+B on Mac).
- Drag the button above onto the bookmarks bar.
- Open any website and click the bookmark — the Loan Calculator panel appears in the top-right corner. Use ✛ to move it between corners, or ›/‹ to tuck it against the edge and pull it back out.
- Click the bookmark again (or the ✕) to close it.
Note: a few sites with strict security policies may block bookmarklets.
Examples
20,000 at 6.5% over 5 years
Input
Amount 20000 · Rate 6.5% · Term 5 yr
Output
Monthly 391.32 · Total paid 23,479.38 · Interest 3,479.38
250,000 mortgage at 5% over 30 years
Input
Amount 250000 · Rate 5% · Term 30 yr
Output
Monthly 1,342.05 · Total paid 483,139.46 · Interest 233,139.46
About this tool
This free online loan calculator works out your fixed monthly payment, the total you'll repay, and the total interest for any amortized loan — mortgage, car loan, student loan, or personal loan. Type in the amount, annual interest rate, and term in years and the result updates instantly, entirely in your browser with no upload.
How to use
- Enter the loan amount you want to borrow.
- Enter the annual interest rate as a percentage (e.g. 6.5).
- Enter the term in years.
- Read your monthly payment, total cost, and interest below.
Good to know
The bar shows how your total repayments split between principal (what you borrowed) and interest (the cost of borrowing). Lowering the rate or shortening the term shrinks the interest slice. This estimate covers principal and interest only — your real payment may also include fees, insurance, or taxes.
Frequently asked questions
How is the monthly loan payment calculated?
It uses the standard amortization formula: M = P · r / (1 − (1 + r)^−n), where P is the loan amount, r is the monthly interest rate (annual rate ÷ 12), and n is the number of monthly payments (years × 12). The result is the fixed payment that pays the loan off exactly on schedule.
Is this loan calculator free?
Yes — it's a completely free online loan calculator with no sign-up. Everything runs in your browser.
What is total interest?
Total interest is everything you pay on top of the amount you borrowed: total payments minus the principal. The longer the term or the higher the rate, the more interest you pay.
Does it work for a mortgage, car loan, or personal loan?
Yes. Any fixed-rate, fully amortized loan — mortgage, auto loan, student loan, or personal loan — uses the same monthly payment math. Just enter the amount, rate, and term.
What currency does it use?
It's currency-neutral. Enter the amount in whatever currency you like — dollars, euros, pounds, yen — and the payment comes back in the same units.
Why is my real payment slightly different?
Lenders may add fees, insurance, taxes, or use a different rounding or compounding convention. This tool gives a clean estimate of principal and interest only, so treat it as a close guide rather than an exact quote.
Is my financial data uploaded anywhere?
No. The calculation runs entirely in your browser with no upload, so your numbers stay private.
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