Auto Loan Calculator
Estimate your monthly car payment, total interest, and total cost. Enter the vehicle price, down payment, trade-in, interest rate, and loan term — and see how negative equity and balloon payments affect what you owe.
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Results
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How Auto Loans Work
An auto loan lets you buy a vehicle now and repay it in fixed monthly installments over a set term. Each payment covers the interest due that month first, and the remainder reduces your principal balance. Early on, more of each payment goes toward interest; as the balance shrinks, more goes toward principal.
Three factors drive your monthly payment: the amount financed, the interest rate (often quoted as APR), and the length of the loan. Understanding how they interact helps you avoid paying more than you need to over the life of the loan.
Principal, rate, and term
The amount financed is the vehicle price minus your down payment and any trade-in value. A higher price or interest rate raises your payment, while a longer term lowers the monthly payment. The catch is that a longer term also means you pay interest for more months, so the total cost climbs even though the monthly figure looks smaller.
The term-length trade-off
Stretching a loan to 72 or 84 months can make an expensive car feel affordable month to month, but you may pay thousands more in total interest. A shorter term carries higher monthly payments yet far less total interest and faster ownership. A good rule of thumb is to choose the shortest term whose payment comfortably fits your budget.
Negative equity: when you're underwater on a car loan
Negative equity — also called being underwater or upside down — means your loan balance is higher than the car is currently worth. To calculate it, subtract the car's market value from your remaining balance. For example, if you still owe $22,000 and the car is worth $18,000, you have $4,000 of negative equity.
Cars depreciate fastest in the first few years, so long terms and small down payments make negative equity far more likely. It matters most when you want to trade in or sell: the shortfall is usually rolled into your next loan, raising that payment too. A larger down payment and a shorter term help you build equity faster and stay ahead of depreciation — try increasing the down payment above to see the amount financed drop.
Balloon payments on car loans
A balloon car loan keeps monthly payments low by deferring a large lump sum — the “balloon” — to the end of the term. Because your regular payments only chip away at part of the balance, a sizeable final payment comes due at the end. It can make a car feel affordable month to month, but you repay more overall and are more likely to end up with negative equity. For most buyers a standard amortizing loan (like the one this calculator models, where every payment reduces the balance) is the safer, cheaper choice.
Down payment, trade-in, and total cost
A meaningful down payment or trade-in reduces the amount financed, lowering both your payment and total interest. Rates on new cars are often lower than on used ones, though used cars cost less overall. Remember the total cost of ownership too: insurance, fuel, registration, and maintenance all add up beyond the loan payment itself.
Frequently asked questions
- Your monthly payment is based on the amount financed (vehicle price minus down payment and trade-in), the annual interest rate, and the loan term in months. The calculator uses the standard amortization formula so each payment covers interest first and the rest reduces your principal.
- Auto loan rates depend heavily on your credit score, the loan term, and whether the car is new or used. Borrowers with strong credit typically get the lowest rates, while longer terms and used vehicles usually carry higher rates. Compare offers from several lenders before committing.
- Yes. A larger down payment lowers the amount you finance, which reduces both your monthly payment and the total interest you pay. It can also help you avoid being "underwater" (owing more than the car is worth) early in the loan.
- A shorter term means higher monthly payments but far less total interest and faster equity. A longer term lowers the monthly payment but costs more overall and keeps you in debt longer. Pick the shortest term whose payment comfortably fits your budget.
- Negative equity — also called being "upside down" or "underwater" — means you owe more on your car loan than the car is currently worth. To calculate it, subtract your car’s market value from your remaining loan balance: if you owe $22,000 and the car is worth $18,000, you have $4,000 of negative equity. It happens most often with long loan terms, small down payments, and fast depreciation early in the loan.
- If you trade in a car with negative equity, the shortfall is usually rolled into your new loan — so you finance the new car plus the old gap, which increases your payment and the total interest. To avoid this, make a larger down payment, choose a shorter term, or wait until you have positive equity before trading in. Use the calculator above to compare how a bigger down payment reduces the amount financed.
- A balloon car loan keeps monthly payments low by deferring a large lump sum — the "balloon" — to the very end of the term. Your regular payments only cover part of what you owe, so a big final payment (often several thousand dollars) is due at the end. It lowers the monthly cost but raises the total you repay and the risk of ending up with negative equity, so weigh it carefully against a standard amortizing loan.