Auto Loan Calculator

Financing a car requires balancing monthly payment affordability with total interest cost. While longer 72-month terms reduce monthly payments, they significantly increase total interest paid.

To use the Auto Loan Calculator, enter your Vehicle Price, Down Payment, Trade-in Allowance and other values. The calculator instantly computes Monthly Auto Loan Payment, Total Amount Financed and more. Results update in real time as you change any input — no submit button needed.

How to Use This Calculator

Enter your Vehicle Price (e.g. 30000 in ), Down Payment (e.g. 5000 in ), Trade-in Allowance (e.g. 2000 in ), Annual Interest Rate (APR) (e.g. 5.5 in %), Loan Term — choose from options such as 72 Months (6 Years), 60 Months (5 Years), 48 Months (4 Years), and Sales Tax Rate (e.g. 6 in %). Results update instantly as you type — no submit button or page reload required. Adjust any value to compare scenarios side by side.

The Formula

Amount Financed P = Vehicle Price + Sales Tax - Down Payment - Trade-in Allowance

Monthly Payment = P × [r(1+r)^n] / [(1+r)^n - 1]

Worked Example

30,000 vehicle, 5,000 down payment, 2,000 trade-in, 6% sales tax, 5.5% interest over 60 months.

• Taxable Amount: 28,

• Sales Tax: 1,

680.

• Total Financed: 24,

680.

• Monthly Payment: 471.55/month. Total Interest: 3,613.00 over 5 years.

Understanding Your Result

In a standard amortizing loan, you pay mostly interest in early payments and mostly principal at the end — this is called front-loading. For a 30-year mortgage at 7%, over 80% of your first payment goes to interest. Total interest paid on a 30-year loan often equals or exceeds the original principal. Each extra principal payment made early eliminates all future interest that would have accrued on that amount. Lenders typically require a debt-to-income (DTI) ratio below 43% for conventional loan approval, with most preferring below 36%.