Car Payment Calculator: Estimate Your Monthly Auto Loan in Seconds

A car payment calculator tells you exactly what you'll pay each month before you sign the paperwork. You enter the loan amount, interest rate, and term—then you see your monthly payment, total interest cost, and full repayment schedule in seconds.

This tool saves you from guesswork and protects you from dealer financing traps.

You input four numbers:

• Loan amount: vehicle price minus down payment and trade-in value
• APR: annual percentage rate, the yearly interest cost
• Loan term: number of months (typically 36, 48, 60, or 72)
• Sales tax and fees: sometimes added to the financed amount

The calculator returns your monthly payment, total interest paid over the life of the loan, and the full amortization schedule showing how much of each payment goes to principal versus interest.

M = P × [r(1+r)^n] / [(1+r)^n - 1]

Where:

• M = monthly payment
• P = principal (loan amount)
• r = monthly interest rate (APR ÷ 12)
• n = number of monthly payments (loan term)

You can calculate this by hand or spreadsheet, but an online car payment calculator does it instantly and shows you the full breakdown.

1. 1Find the vehicle price. Look at the sticker price or the out-the-door quote from the dealer.

1. 1Subtract your down payment. If you're putting $5,000 down on a $30,000 car, your loan amount starts at $25,000.

1. 1Add trade-in value. If your current car is worth $3,000, subtract that from the loan amount ($25,000 - $3,000 = $22,000).

1. 1Enter the APR. Check your pre-approval letter or the dealer's rate sheet. APR includes interest plus loan fees, so it's always higher than the base interest rate.

1. 1Choose the loan term. Common terms are 36, 48, 60, or 72 months. Longer terms lower the monthly payment but increase total interest.

1. 1Review the results. The calculator shows monthly payment, total interest, and total cost (principal + interest).

1. 1Compare scenarios. Change the down payment, APR, or term to see how each variable affects your budget.

Most calculators let you toggle sales tax, registration fees, and dealer add-ons to see the true financed amount.

Here's what a $25,000 auto loan looks like at 6.5% APR across three common terms:

A car payment calculator lets you model these trade-offs before you commit.

The annual percentage rate determines how much you pay for the privilege of borrowing. A 3% APR versus a 7% APR on the same $25,000 loan over 60 months changes your total interest by more than $2,600.

Your APR depends on your credit score, loan term, and whether you're buying new or used. New-car loans typically carry lower rates (2.5%–5.5% in 2026) than used-car loans (4.5%–9.5%).

If you have fair or poor credit, improving your score by 50 points before you apply can save you thousands in interest. Check [money management strategies](/money-and-debt) to boost your credit profile.

If you finance the tax, add it to the loan amount in the car payment calculator. A $30,000 car with 7% sales tax becomes a $32,100 financed amount, raising your monthly payment by about $35–$40 on a 60-month term.

Other buyers prefer to pay sales tax, title, and registration fees in cash at signing to keep the loan balance—and the interest cost—lower.

Putting $6,000 down on a $30,000 vehicle instead of $3,000 saves you roughly $60/month and $700 in interest over five years at 6% APR.

Use a car payment calculator to test different down-payment scenarios. If you're shopping for a vehicle right now and need to grow your savings fast, explore side-income ideas on our [career and income](/career-and-income) page.

Cars depreciate fastest in the first three years. If you stretch a $28,000 loan over six years at 7% APR, you'll owe $18,500 after three years but the car may only be worth $14,000.

A car payment calculator won't show depreciation, but it will show you how slowly the principal balance falls on a long loan. Compare that to typical depreciation curves (new cars lose 20%–30% in year one, then 10%–15% per year after) to spot trouble.

Ignoring insurance costs. Your lender requires full coverage (collision and comprehensive) for the life of the loan. Get an insurance quote before you calculate affordability.

Using the advertised APR. Promotional rates (0.9%, 1.9%) usually require excellent credit. Enter the rate you actually qualify for, not the billboard offer.

Skipping the amortization table. Most calculators show you a payment-by-payment breakdown. Check how much of your first payment is interest (often 70%–80%) versus principal.

Dealers make money three ways: the sale price, the trade-in spread, and the financing markup. They can mark up the lender's buy rate (the actual APR you qualify for) by 1–2 percentage points and pocket the difference.

If the dealer offers a lower rate or better terms, great—but confirm the numbers in the calculator before you sign. Learn more about negotiating and comparing offers in our [free financial tools](/free-tools) section.

If interest rates drop or your credit score improves, you can refinance your car loan to a lower APR and reduce your monthly payment or total interest.

Example: you have $18,000 left on a 60-month loan at 7.5% APR with 36 months remaining. Refinancing to 5.0% APR for 36 months drops your payment from $538 to $511 and saves $970 in interest.

Some lenders charge a refinance fee ($50–$150), so factor that into the total savings.

What is the formula for calculating a car payment?

How much car can I afford with a $500 monthly payment?

At 6% APR over 60 months, a $500 monthly payment supports a loan of roughly $26,000. Add your down payment and trade-in to find the total vehicle price you can afford.

Does a car payment calculator include insurance and taxes?

Most basic calculators show only the loan payment (principal and interest). Some advanced tools let you add sales tax to the financed amount, and a few include estimated insurance and registration fees.

Should I finance a car for 60 or 72 months?

Can I use a car payment calculator for a lease?

No. Lease payments use a different formula based on the vehicle's residual value, money factor (lease interest rate), and depreciation.