Loan Calculator — monthly payments, instant & private
Estimate your monthly payment and total cost — updated live as you type.
This tool runs entirely in your browser. Your files are never uploaded — they stay on your device.
- Principal
- $20,000.00
- Total interest
- $3,479.38
- Total repayment
- $23,479.38
Estimate your monthly payment and total cost — updated live as you type.
Before you commit to a loan, it helps to know exactly what it will cost. Enter the amount you want to borrow, the annual interest rate and the term, and this calculator shows your monthly payment along with the total interest and total amount you will repay.
Everything is worked out instantly in your browser using the standard amortization formula — there are no servers, no sign-up and nothing is uploaded. Adjust the figures and watch the results update in real time.
How to use Loan Calculator
- Enter the loan amount you want to borrow.
- Enter the annual interest rate as a percentage.
- Set the loan term and choose years or months.
- Read your monthly payment, total interest and total repayment — they update as you type.
Frequently asked questions
How is the monthly payment calculated?
It uses the standard amortization formula: M = P · r · (1 + r)^n / ((1 + r)^n − 1), where P is the loan amount, r is the monthly interest rate (annual rate ÷ 12) and n is the number of monthly payments. When the rate is 0%, the payment is simply the amount divided by the number of months.
What is the difference between total interest and total repayment?
Total repayment is the sum of every monthly payment over the life of the loan. Total interest is that figure minus the original amount you borrowed — in other words, the cost of borrowing.
Are my numbers sent to a server?
No. The calculation runs entirely in your browser, so the figures you enter never leave your device. It even works offline once the page has loaded.
Is this an exact quote for a loan?
No. It is an estimate based on a fixed interest rate and equal monthly payments. Real loans may include fees, insurance or a different compounding method, so always check the official terms from your lender.