Auto Loan Calculator
Estimate monthly payment for a car loan.
How Auto Loans Work and What You Need to Know
An auto loan is a structured installment loan designed specifically for purchasing a vehicle. When you take out an auto loan, a financial institution—such as a bank, credit union, or online lender—advances you the funds required to buy the car, and in return, you agree to repay the principal amount plus interest over a predetermined repayment period (usually expressed in months, such as 36, 48, 60, or 72 months). Because auto loans are secured loans, the vehicle itself serves as collateral. This means that if you fail to make your monthly payments on time, the lender retains the legal right to repossess the vehicle to recover their outstanding balance.
Understanding the Annual Percentage Rate (APR) is critical when shopping for auto loans. The APR represents the true yearly cost of borrowing, which includes both the nominal interest rate and any additional fees charged by the lender (such as origination or processing fees). A higher APR will dramatically increase your monthly payment and the total interest paid over the life of the loan. Car loan interest is typically calculated using a simple interest formula, meaning interest is calculated daily or monthly based on your remaining principal balance. Paying extra toward your principal balance whenever possible is an excellent way to reduce the total amount of interest you owe and shorten your loan term.
One of the most important decisions when purchasing a vehicle is choosing between new and used car loans, as interest rates differ substantially between the two. Generally, new car loans feature much lower interest rates than used car loans. This is because new cars have higher, more predictable resale values, representing lower risk for the lending institution. Conversely, used cars depreciate more rapidly and have less predictable market values, leading lenders to offset this risk by charging higher interest rates. However, because used cars have a much lower purchase price initially, the total loan amount may be smaller, which can still result in a lower monthly payment despite the higher APR.
Beyond the monthly principal and interest payment, it is crucial to account for the total cost of ownership (TCO) when budgeting for a vehicle. Many buyers make the mistake of only budgeting for their auto loan payment. In reality, owning a car involves several ongoing expenses, including comprehensive auto insurance (which lenders require for financed vehicles), state sales taxes, vehicle registration fees, fuel costs, and regular maintenance or emergency repairs. Experts recommend that your total car-related expenses—including your loan payment, insurance, and fuel—should not exceed 10% to 15% of your take-home pay to avoid straining your monthly budget.
To use our auto loan estimator effectively, start by inputting the total amount you need to borrow after subtracting your down payment and any trade-in value. Next, input a realistic interest rate (APR) based on your current credit score. Finally, select your desired loan term in years. Click "Calculate" to instantly view an estimate of your monthly principal and interest payment. We encourage you to test multiple scenarios, such as comparing a 3-year term against a 5-year term, to see how a shorter loan length can save you thousands of dollars in total interest charges even though it raises your monthly payment.
How to use this calculator
Enter realistic assumptions, run the estimate, then test a higher and lower scenario. Small changes to rates, time, and payments can change the result significantly.