What Is a Car Loan Calculator?
A car loan calculator estimates the fixed monthly payment on an auto loan based on three inputs: the amount you borrow (principal), the annual interest rate, and the loan term in months. It also shows the total interest you'll pay over the life of the loan and the total amount repaid, helping you compare financing offers before signing.
How to Use It
Enter the loan amount (vehicle price minus any down payment and trade-in), the annual percentage rate offered by your lender, and the term in months (common terms are 36, 48, 60, or 72 months). The calculator instantly returns your monthly payment, the total interest cost, and the total of all payments.
The Formula Explained
The payment uses the standard amortization formula: $$M = P \cdot \frac{r(1+r)^n}{(1+r)^n - 1}$$ Here \(P\) is the principal, \(r\) is the monthly interest rate found by dividing the annual rate by 12, and \(n\) is the total number of monthly payments. If the rate is 0%, the payment is simply the principal divided by the number of months.
Worked Example
Suppose you borrow $25,000 at 6% annual interest over 60 months. The monthly rate is \(0.06 / 12 = 0.005\), and \(n = 60\). Plugging in: $$M = 25000 \times \frac{0.005 \times (1.005)^{60}}{(1.005)^{60} - 1} \approx \$483.32$$ per month. Over 60 months you pay about $28,999.20 total, of which roughly $3,999.20 is interest.
FAQ
Does this include taxes and fees? No — enter the actual financed amount. Add sales tax, title, and registration fees to the price if they are rolled into the loan.
How can I lower my payment? A larger down payment, a lower interest rate, or a longer term all reduce the monthly payment, though a longer term increases total interest.
Is the rate the APR? Use the annual percentage rate (APR) quoted by your lender for the most accurate result, since it reflects the true yearly cost of borrowing.
