About this tool
Auto / Car Loan Calculator is a free, in-browser tool that works out your monthly car payment from the vehicle price, down payment, trade-in value, taxes and fees, interest rate and term. Nothing is uploaded — every figure is computed locally as you type.
The amount financed is price − down payment − trade-in + taxes and fees. The monthly payment then follows the standard amortization formula M = P·r/(1 − (1+r)⁻ⁿ), where r is the annual rate divided by 12 and n is the term in months.
Use it to compare dealer offers: change the down payment or term and watch the monthly payment, total interest and total paid update instantly, so you can see exactly what a longer loan really costs.
Frequently asked questions
How is the amount financed calculated?
It is the vehicle price minus your down payment and trade-in value, plus taxes and fees — fees are assumed to be rolled into the loan. If the result is zero or negative there is nothing to finance and the tool tells you so.
What rate convention does the calculator use?
The rate you enter is an annual percentage rate (APR) compounded monthly: the monthly rate is APR ÷ 12 ÷ 100, the standard convention for car loans.
Why does a longer term cost more overall?
A longer term lowers the monthly payment but interest accrues on the balance for more months, so the total interest tile grows. Compare the total paid across terms to see the true cost.
Is my financial data uploaded anywhere?
No. The calculator runs entirely in your browser — prices, rates and payments never leave your device.