Auto Loan Calculator - Car Payment Estimate

Use this auto loan calculator to estimate your monthly car payment, total interest and total cost of your car loan.

How this auto loan calculator works

Enter the car price, your down payment, the annual interest rate and the term of the loan. The calculator subtracts the down payment from the price to get the loan amount and then uses the standard amortization formula to estimate your monthly payment.

Frequently asked questions

How much should I put down on a car?

Many lenders recommend at least 10–20% down to avoid being “upside down” on your loan, but it depends on your budget and the car price.

Is a longer car loan better?

Longer terms lower the monthly payment but increase the total interest paid. Use this calculator to compare different terms.

Auto Loan Calculator Explained

This auto loan calculator helps you estimate the monthly payment and total cost of financing a car. You can use it for new or used vehicles, refinancing, or comparing dealer offers with bank or credit union loans.

How auto loan payments are calculated

Auto loans are typically fixed-rate installment loans. The payment is calculated with the standard amortization formula:

Payment = P × r / (1 – (1 + r)^-n)

P = loan amount (price minus down payment and trade-in)
r = monthly interest rate (APR ÷ 12)
n = total number of monthly payments

Example auto loan

Car price: $32,000
Down payment: $4,000
Loan amount: $28,000
APR: 7.5%
Term: 60 months (5 years)

Estimated monthly payment ≈ $562

Total paid over the life of the loan ≈ $33,720

Total interest cost ≈ $5,720

The calculator shows how changing rate, term, or down payment affects both monthly cost and total interest.

New vs used car interest rates

In the U.S., interest rates for new cars are usually lower than for used cars:

New car loans often have lower APRs and longer terms.
Used car loans can have higher APRs and shorter terms.
“0% APR” deals often require excellent credit and may replace other rebates.

Use this calculator to compare dealer financing with bank or credit union options.

Loan term: short vs long

A longer term lowers the monthly payment but increases total interest. A shorter term does the opposite.

Term	Payment	Total Interest
36 months	Higher	Much lower
60 months	Moderate	Higher
72–84 months	Lowest	Very high

Very long terms (72–84 months) can keep you “upside down” on the loan for years, meaning you owe more than the car is worth.

How much should I put down?

Common guidelines:

At least 10–20% down on a new car.
Enough so that loan balance is below expected resale value after a couple of years.
More down payment = smaller loan, lower payment, and less interest.

Use the calculator to test different down payment amounts and see how they change monthly payment and total cost.

Auto loan tips

Shop the interest rate before visiting the dealership.
Negotiate the price of the car separately from financing terms.
Avoid rolling negative equity from an old loan into a new one if possible.
Consider total cost of ownership: insurance, fuel, maintenance, registration and taxes.

FAQ

Is it better to finance through a dealer or bank?
Dealers sometimes offer low promotional APRs, but banks and credit unions may offer more transparent, stable rates. Always compare total cost.

How does my credit score affect APR?
Higher credit scores usually mean lower interest rates. Subprime borrowers may see much higher APRs.

Can I pay off an auto loan early?
Most auto loans in the U.S. allow early payoff without penalty, but always check for prepayment clauses in your contract.

How can I lower my monthly payment?
You can lower the price of the car, increase the down payment, extend the loan term, or refinance at a lower APR. The calculator lets you test each option.

Use this auto loan calculator any time you compare vehicles or financing offers so you can clearly see the real monthly cost and total interest before signing a contract.