Introduction
Buying a used car is a big decision, and knowing your monthly payment before you sign a loan can save you a lot of stress. This free used car loan calculator helps you figure out exactly what you will pay each month, how much interest you will owe, and what the total cost of your loan will be.
The tool has three modes. The Simple Calculator gives you a quick monthly payment estimate when you enter a loan amount, term, and interest rate. The Full Purchase Builder lets you add your down payment, trade-in value, sales tax, and fees so you can see the true cost of your deal. The Affordability Calculator works in reverse — you enter the monthly payment you can handle, and it tells you the most you can spend on a car.
You can also compare different loan terms side by side, see how extra payments shorten your loan, and view a full amortization schedule that breaks down every single payment. Each calculation includes a step-by-step explanation so you can see exactly how the math works.
How to Use Our Used Car Loan Calculator
Enter your loan details below to see your estimated monthly payment, total interest, and total cost. This calculator has three modes. Pick the one that fits your needs.
Simple Calculator
Use this tab when you already know how much you need to borrow.
Loan Amount — Type the total dollar amount you plan to finance. This is the amount you borrow from the lender, not the car's full price.
Loan Term — Pick how many months you want to take to pay off the loan. Shorter terms mean higher payments but less interest. Longer terms lower your payment but cost more overall.
Annual APR — Enter the yearly interest rate your lender quoted you. Used car rates often range from 5% to 20% or more based on your credit score. If you need help understanding how APR is calculated, try our APR calculator.
Full Purchase Builder
Use this tab to build your loan amount from scratch using the car's price, your down payment, trade-in, taxes, and fees.
Car Purchase Price — Enter the total price of the used car you want to buy. If you're unsure what a vehicle is worth, a car value calculator can help you estimate.
Down Payment — Enter the cash you will pay upfront at the dealer. A bigger down payment means a smaller loan.
Trade-in Value — Enter what the dealer will give you for your current car. This lowers the amount you need to finance. Keep in mind that your current vehicle loses value over time — our car depreciation calculator can show you how much.
Amount Owed on Trade-in — If you still owe money on your current car, enter that balance here. If you owe more than your trade-in is worth, the extra amount gets added to your new loan.
Title, Registration & Other Fees — Enter the total of any extra fees like title, tags, or dealer fees.
State — Choose your state from the dropdown. The calculator will fill in your state's sales tax rate for you.
Sales Tax Rate — This auto-fills when you pick a state. You can change it if your local rate is different. You can also use our sales tax calculator to double-check the exact amount you owe.
Include Taxes & Fees in Loan — Check this box to roll your taxes and fees into the loan. Uncheck it if you plan to pay them out of pocket at signing.
Loan Term — Pick how many months you want to repay the loan.
Annual APR — Enter the yearly interest rate from your lender.
Affordability / Reverse Calculator
Use this tab when you know how much you can pay each month and want to find out how expensive a car you can afford.
Desired Monthly Payment — Enter the most you want to pay each month. The calculator works backward to find the biggest loan and car price this payment supports.
Loan Term — Pick the number of months for the loan.
Annual APR — Enter the yearly interest rate you expect to receive.
Down Payment — Enter the cash you plan to put down. This adds to the vehicle price you can afford.
Trade-in Value — Enter what your current car is worth as a trade-in. This also raises the price you can afford.
Amount Owed on Trade-in — Enter any remaining loan balance on your current car. Owing more than the trade-in is worth lowers the car price you can afford.
Shared Tools
Monthly Gross Income — Enter your monthly income before taxes to see how your car payment compares to what you earn. A ratio under 10% is comfortable, 10% to 15% is manageable, and over 15% may strain your budget. For a more complete picture of your debt obligations, check out our DTI calculator.
Extra Payment per Month — Enter any extra amount you could pay on top of your required payment. The calculator shows how much interest you save and how many months sooner you pay off the loan. If you have other debts you want to tackle at the same time, our debt payoff calculator can help you build a plan.
How Used Car Loans Work
A used car loan is money you borrow from a bank, credit union, or dealer to pay for a pre-owned vehicle. You pay the money back each month over a set period of time, called the loan term. Common terms are 36, 48, 60, 72, or 84 months. The lender charges you interest for borrowing the money, shown as an annual percentage rate (APR). The higher your APR, the more you pay in total. For a broader look at loan math, our general loan calculator covers the same fundamentals.
Your monthly payment depends on three things: how much you borrow, your APR, and your loan term. A longer term means a lower monthly payment, but you end up paying more interest over the life of the loan. A shorter term costs more each month but saves you money overall.
What Affects Your APR
Used car loan rates are usually higher than new car loan rates. Your credit score is the biggest factor in the rate you get. Buyers with good credit often see rates between 5% and 8%. Buyers with poor credit may face rates of 15% or higher. Shopping around with multiple lenders can help you find a lower rate. If you're comparing a new vehicle instead, our auto loan calculator is built for that scenario.
Down Payments and Trade-Ins
A down payment is cash you pay upfront to reduce the amount you need to borrow. A trade-in works the same way — the dealer gives you credit for your old car and subtracts that value from the price of the one you're buying. Both lower your loan amount, which means a smaller monthly payment and less interest paid.
If you still owe money on your current car and that balance is more than the car is worth, the difference is called negative equity. That extra amount gets added to your new loan, which increases your monthly payment and total cost.
Taxes and Fees
When you buy a used car, you typically owe sales tax based on your state's rate. You also pay fees for the title, registration, and other paperwork. You can either pay these costs upfront at signing or roll them into your loan. Rolling them in keeps more cash in your pocket now but increases the total amount you finance and the interest you pay.
Tips for Getting a Good Deal
- Put money down. Even a small down payment reduces your loan and saves you interest.
- Choose the shortest term you can afford. You'll pay less interest overall.
- Check your credit before you shop. Knowing your score helps you spot a fair rate.
- Make extra payments when you can. Paying even a little extra each month cuts your interest and helps you pay off the loan faster.
- Keep your car payment under 10–15% of your monthly income. This helps make sure the payment fits your budget. Also consider other vehicle costs like car insurance and fuel costs.