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Car Loan Calculator

Calculate your auto loan monthly payment and total cost of financing.

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What is Car Loan Calculator?

A car loan calculator helps you estimate your monthly auto loan payment and the true total cost of vehicle financing. Cars depreciate rapidly — many lose 20% of their value within the first year — so understanding how your loan balance compares to the vehicle's declining market value is critical. Dealer financing can seem convenient, but dealers often mark up the interest rate as a profit center. Credit unions and online lenders frequently offer rates 1–3% lower on the same loan. The calculator lets you compare scenarios: a credit union rate vs. dealer financing, or a shorter loan term vs. a longer one. GAP insurance is worth factoring in too — it covers the difference between what you owe and what the car is worth if it is totaled or stolen before you pay it off.

How to use

  1. Enter the vehicle price, including any dealer fees, minus your down payment or trade-in value.
  2. Input the annual interest rate — use your pre-approved rate or the dealer's quoted rate.
  3. Choose your loan term in months (36, 48, 60, or 72 months are most common).
  4. Click Calculate to see your monthly payment and total interest paid over the life of the loan.
  5. Compare scenarios: run the same loan amount at a credit union rate vs. dealer rate to see the dollar difference.
  6. Factor in insurance, registration, and maintenance on top of the payment to get your true monthly transportation cost.

Why it matters

Auto loan rates and terms significantly affect the total cost of a vehicle. A $30,000 car financed at 4% over 48 months costs about $2,500 in interest. The same loan at 10% over 72 months costs over $10,000 in interest — and the car may be worth less than you owe for much of that period. Long loan terms (72–84 months) are increasingly common but carry real risk: you remain underwater — owing more than the market value — for years, making it difficult to sell or trade without rolling negative equity into your next loan.

Pro tip

Get pre-approved by your bank or credit union before visiting a dealership. Knowing your rate gives you a benchmark to evaluate the dealer's financing offer. Also negotiate the vehicle price separately from financing — dealers sometimes use monthly payment framing to obscure the true purchase price and inflate total cost.

Frequently Asked Questions

A car loan calculator uses your loan amount, interest rate, and loan term to compute your monthly payment using the standard amortization formula. It also shows total interest paid, helping you understand the true cost of financing a vehicle.
Auto loan rates vary by credit score and loan term. Rates typically range from 5-15%. Excellent credit (720+) can qualify for rates under 6%.
Most financial advisors recommend a down payment of at least 10-20% of the vehicle purchase price. A larger down payment reduces your loan amount, lowers your monthly payment, and reduces the risk of being underwater on the loan — owing more than the car is worth.
Paying cash avoids interest charges entirely, but if you can invest that cash at a higher return than your loan interest rate, financing may make financial sense. Compare the total cost of financing against what your money could earn elsewhere before deciding.
A shorter term (e.g., 36 or 48 months) means higher monthly payments but less total interest and faster payoff. A longer term (e.g., 72 or 84 months) lowers your monthly payment but significantly increases total interest and the risk of negative equity as the car depreciates.
Beyond the loan payment, budget for car insurance, registration and taxes, routine maintenance, fuel, and any dealer fees. These costs can add hundreds of dollars per month on top of your loan payment.
Yes. The calculator works for any auto loan — new or used. Note that used car loans often carry higher interest rates than new car loans, so make sure you enter the actual rate your lender quotes you.
Improving your credit score before applying, making a larger down payment, choosing a shorter loan term, and shopping multiple lenders (including credit unions) can all help you secure a lower rate. Getting pre-approved before visiting a dealership also strengthens your negotiating position.
Shorter terms mean higher monthly payments but less total interest. Longer terms lower your payment but you pay more overall and risk being underwater on the loan.
A common rule is that your total car payment should not exceed 15% of your monthly take-home pay. Include insurance, gas, and maintenance in your budget.