How to calculate your loan payment

See what a car, personal, or student loan really costs — monthly payment, total interest, and total repaid.

Before signing any loan, you want three numbers: what you'll pay each month, how much interest you'll pay over the life of the loan, and the total you'll hand back. Lenders quote the monthly figure, but the total interest is what shows you the real cost of borrowing. The Toolsfully loan calculator computes all three instantly using the same amortization formula banks use — and because it runs in your browser, your financial details are never sent anywhere.

Step-by-step

1. Open the Loan calculator. Go to Calculators — the Loan tab is selected by default.
2. Enter the loan amount. This is the amount you're borrowing, not the price of the thing you're buying (subtract any deposit first).
3. Enter the interest rate. Use the APR your lender quoted, e.g. 7.5.
4. Enter the term in years. The results update instantly — no button to press. Half-years like 2.5 work too.

Tips

• Compare terms. A longer term lowers the monthly payment but raises the total interest — flip between 3, 5, and 7 years and watch the "Total interest" tile.
• Rate shopping pays. Even one percentage point of APR makes a surprising difference on total interest. Try both rates you've been quoted.
• 0% offers work too. For interest-free financing, enter 0 as the rate — the payment is simply the amount divided by the months.

Frequently asked questions

How is the payment calculated?

It uses the standard amortization formula for fixed-rate loans — the same one banks and lenders use for principal-and-interest payments.

Does it include fees?

No. Origination fees, insurance, and taxes vary by lender and aren't included — treat the result as the principal-and-interest baseline.

Is my data private?

Completely. The math runs in your browser; the numbers you type never leave your device.