Car Payment Calculator
Estimate your monthly auto loan payment, total interest, and the full cost of financing a vehicle. Factor in your down payment, trade-in, sales tax, and APR.
Estimated Monthly Payment
$635
for 60 months
Amount Financed
$32,450
principal
Total Interest
$5,645
over loan
Sales Tax
$2,450
one-time
Total Cost
$43,095
price + tax + interest
Over the life of the loan you'll pay $5,645 in interest on top of the $32,450 you financed.
What is a Car Payment Calculator?
A car payment calculator is a financial tool that estimates your monthly auto loan payment before you ever step into a dealership. By entering the vehicle price, your down payment, any trade-in value, the interest rate (APR), the loan term, and your local sales tax, it instantly shows what you can expect to pay each month — along with the total interest and the true overall cost of the vehicle.
Financing a car is one of the largest recurring expenses most households take on, and the monthly payment is only part of the story. Two loans with the same monthly payment can cost thousands of dollars apart once you account for the interest rate and term length. A car payment calculator brings all of these variables together so you can see the complete picture and avoid being surprised by the numbers on the dealer's paperwork.
This calculator is especially useful for setting a realistic budget, comparing financing offers from different lenders, understanding how a larger down payment or shorter term changes your costs, and deciding whether a particular vehicle fits comfortably within your finances. Used before you shop, it puts you in a far stronger negotiating position.
How to Use the Car Payment Calculator
Enter the Vehicle Price
Input the negotiated price of the car before tax. Use the out-the-door price you expect to pay, not the MSRP if you plan to negotiate.
Add Down Payment & Trade-In
Enter how much cash you will put down and the value of any vehicle you are trading in. Both reduce the amount you finance.
Set Your Rate & Term
Enter the APR you have been quoted (or expect based on your credit) and the loan length in months, plus your local sales tax rate.
Review Your Results
See your estimated monthly payment, amount financed, total interest, and total cost, then compare different terms in the chart.
How the Car Payment Is Calculated
The calculator uses the standard loan amortization formula after determining how much you actually finance:
1. Amount Financed
Loan = (Price + Sales Tax) − Down Payment − Trade-In
2. Monthly Interest Rate
r = APR ÷ 12 ÷ 100
3. Monthly Payment
Payment = (Loan × r) ÷ (1 − (1 + r)^−n)
4. Total Interest
Total Interest = (Payment × n) − Loan
Worked example: On a $35,000 vehicle with $5,000 down, no trade-in, a 7% sales tax, a 6.5% APR, and a 60-month term: sales tax is $35,000 × 7% = $2,450, so the amount financed is $35,000 + $2,450 − $5,000 = $32,450. With a monthly rate of 0.00542 over 60 months, the payment works out to about $635/month, with roughly $5,640 in total interest.
Example Calculations
Tips to Lower Your Car Payment
Make a larger down payment
Putting more money down reduces the amount you finance, lowering both your monthly payment and the total interest you pay.
Improve your credit first
A higher credit score can shave several percentage points off your APR, saving thousands over the life of the loan.
Keep the term short
Choose the shortest term you can comfortably afford. A 48 or 60-month loan costs far less interest than 72 or 84 months.
Get pre-approved
Secure financing from a bank or credit union before visiting the dealer so you can compare and negotiate the rate.
Negotiate the price, not the payment
Dealers may lower your monthly payment by extending the term. Focus on the total out-the-door price instead.
Avoid rolling in negative equity
Financing what you still owe on a trade-in adds to your loan and can leave you upside down on the new vehicle.
Understanding Auto Loans and the True Cost of Financing
An auto loan's monthly payment is shaped by four levers: the amount financed, the interest rate, the loan term, and any fees or taxes rolled in. Understanding how these interact is the key to financing a car wisely. The most visible number — the monthly payment — can be deceptively low when stretched over a long term, hiding the fact that you are paying far more in total interest.
Consider the term-length trade-off. Extending a loan from 60 to 84 months can drop the monthly payment by $100 or more, which feels like a win. But those extra 24 months of interest, combined with a vehicle that depreciates the entire time, often mean you owe more than the car is worth for years. This "negative equity" makes it hard to sell or trade in the vehicle and is one of the most common financial traps in car buying.
The interest rate (APR) is where your credit score matters most. A buyer with excellent credit might secure a 5% rate while someone with fair credit pays 12% or more on the same car — a difference of thousands of dollars. Because of this, it pays to check your credit, shop multiple lenders, and get pre-approved before you negotiate. A common budgeting guideline, the 20/4/10 rule, suggests putting at least 20% down, financing for no more than 4 years, and keeping total vehicle expenses (including insurance) under 10% of your gross income.
| Credit Tier | Typical Score | Typical New-Car APR |
|---|---|---|
| Superprime | 781-850 | ~5-6% |
| Prime | 661-780 | ~6-7% |
| Nonprime | 601-660 | ~9-11% |
| Subprime | 501-600 | ~13-18% |
| Deep Subprime | 300-500 | ~15-21% |
Learn how auto loans work and compare options at the Consumer Financial Protection Bureau and review current average auto loan rates and trends at Edmunds.
Frequently Asked Questions
What is a car payment calculator?
A car payment calculator estimates your monthly auto loan payment based on the vehicle price, down payment, trade-in value, interest rate (APR), loan term, and sales tax. It also shows how much total interest you will pay over the life of the loan and the total cost of the vehicle.
How is my monthly car payment calculated?
The calculator uses the standard loan amortization formula. It first determines the amount financed (vehicle price plus sales tax, minus your down payment and trade-in), then applies your monthly interest rate over the number of months in your term. A longer term lowers the monthly payment but increases total interest paid.
How much should I put down on a car?
A common guideline is 20% down for a new car and 10% for a used car. A larger down payment reduces the amount you finance, lowers your monthly payment, reduces total interest, and helps you avoid being "upside down" (owing more than the car is worth). Even a few thousand dollars down can make a meaningful difference.
Does the loan term affect how much I pay?
Yes. A longer loan term (such as 72 or 84 months) reduces your monthly payment but significantly increases the total interest you pay. A shorter term (such as 36 or 48 months) has higher monthly payments but saves money overall and builds equity faster. Many experts recommend keeping auto loans to 60 months or less.
Is sales tax included in my car loan?
In most U.S. states, sales tax is calculated on the vehicle price minus any trade-in value, and it can be rolled into the loan amount or paid upfront. This calculator adds the sales tax to the financed amount by default, which reflects how most dealerships structure the deal.
What credit score do I need for a good car loan rate?
Generally, a credit score of 720 or higher qualifies for the best APRs, while scores below 620 are considered subprime and carry much higher rates. Improving your credit, shopping multiple lenders, and getting pre-approved before visiting the dealer can all help you secure a lower interest rate.