Auto Loan Calculator
A car is one of the biggest purchases most people ever make, and the monthly payment is only part of the story. The sticker price, your down payment, the value of your trade-in, the interest rate, and the length of the loan all combine to decide what the car really costs you by the time it is paid off. A payment that looks comfortable can hide thousands of dollars in extra interest if the term is stretched too long, and a small change in the interest rate can move your payment by more than you would expect. This free auto loan calculator cuts through the sales talk. Enter the car price, your down payment, any trade-in value, the annual interest rate, and the loan term in years, and it instantly shows your loan amount, your monthly payment, the total interest you will pay, and the full cost of the car including your down payment. The year-by-year breakdown table shows how each payment is split between interest and principal, and how the remaining balance falls over time. Run the numbers for a few different terms and down payments before you visit a dealer, and you will know exactly which deal is genuinely affordable.
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Monthly payment
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Year-by-Year Breakdown
How to Use This Calculator
- Enter the car price. Use the out-the-door price if you have it, or the sticker price for a first estimate. Remember that taxes and fees will add to the amount you finance.
- Subtract what you are bringing to the deal. Enter your cash down payment and the value of any trade-in. Both reduce the loan amount dollar for dollar.
- Set the interest rate and loan term. Use the rate you were quoted or pre-approved for, and try terms of 3, 4, 5, and 6 years to see how the payment and the total interest change.
- Click Calculate and compare the total cost. Your monthly payment appears at the top, with total interest and total cost below. The yearly table shows how quickly the balance falls and how much of each year goes to interest.
Worked Example
Suppose you buy a $30,000 car with a $3,000 down payment, no trade-in, a 6% interest rate, and a 5-year loan. Your loan amount is $27,000, which is $30,000 minus the $3,000 down payment. At 6% over 60 months, the monthly payment is $521.99. Over the life of the loan you make 60 payments of $521.99, a total of $31,319.14, of which $4,319.14 is interest and $27,000 repays the loan itself. Add back your $3,000 down payment and the total cost of the car is $34,319.14. The yearly breakdown shows the interest shrinking fast: in the first year you pay about $1,490.14 in interest, while in the final year you pay only about $198.91, because most of the balance is already gone. Now try a 7-year term with the same numbers and the payment drops, but the total interest climbs well past $6,000, which is why a shorter term is usually worth the higher monthly payment if your budget can handle it.
Frequently Asked Questions
How is a monthly car payment calculated?
A monthly car payment is calculated from the loan amount, the annual interest rate, and the number of months you will repay it. First the car price is reduced by your down payment and trade-in value to get the loan amount. Then the standard amortizing loan formula spreads that amount over the term, with each payment covering that month's interest plus a slice of principal. A lower rate, a bigger down payment, or a shorter term all change the payment in different ways.
Is a longer auto loan term better because the payment is lower?
A longer term does lower the monthly payment, but it costs you more overall. You pay interest for more months, and the total interest rises sharply: stretching a loan from 5 years to 7 years can add thousands of dollars in interest. Longer loans also leave you owing more than the car is worth for longer, which is risky if the car is totaled or you need to sell it. A shorter term you can comfortably afford is usually the better deal.
How much should I put down on a car?
A down payment of 20 percent is a good target for a new car, and around 10 percent for a used car. A bigger down payment lowers your loan amount, your monthly payment, and your total interest, and it protects you from owing more than the car is worth as it depreciates. If you have a trade-in, its value works the same way as cash down, reducing the amount you need to finance.
Does my credit score affect my auto loan rate?
Yes, a great deal. Lenders offer their lowest rates to borrowers with excellent credit, while a lower score can mean a rate several points higher, adding hundreds of dollars a year in interest on the same car. Checking your credit report before you shop, fixing any errors, and getting pre-approved from a bank or credit union before visiting a dealer can save you real money.
Should I focus on the monthly payment or the total cost?
Always look at the total cost. Dealers often steer the conversation to the monthly payment because stretching the term makes almost any car look affordable month to month, while quietly adding thousands in interest. Compare loans by their total cost, meaning the down payment plus all monthly payments, and choose the shortest term with a payment that fits your budget.