Car Loan Calculator

How to Use This Car Loan Calculator

Enter the vehicle price, your down payment, any trade-in value, the annual interest rate, and loan term. Optionally add sales tax and fees. Hit Calculate Payment to see your monthly payment, total cost, and a full month-by-month amortization table.

Why This Matters

Buying a car is one of the largest purchases most people make — and the difference between a good deal and an expensive mistake often comes down to understanding the numbers. A $30,000 car financed over 72 months at 7% APR costs nearly $6,800 in interest alone. That same car financed over 48 months saves you over $2,000 in interest, even though monthly payments are higher.

Dealerships love to focus the conversation on monthly payment rather than total cost. A salesperson might offer to "get you to $400/month" by stretching the loan to 84 months — but you could end up paying $10,000+ more over the life of the loan. This calculator makes the full picture instantly visible.

It's also useful before you even walk into a dealership. Knowing your max comfortable monthly payment and working backwards to a vehicle price range gives you negotiating power. If you're trading in a vehicle, see exactly how that changes your loan balance and total interest.

How It's Calculated

Your monthly payment uses the standard amortization formula:

M = P × [r(1+r)^n] / [(1+r)^n − 1]

Where:
M = monthly payment
P = loan principal (price − down payment − trade-in + tax + fees)
r = monthly interest rate (annual rate ÷ 12)
n = number of monthly payments (loan term in months)

For 0% interest, the monthly payment is simply the loan amount divided by the number of months. Each month's interest is calculated on the remaining balance, so early payments are mostly interest while later payments are mostly principal.

Tips & Common Mistakes

• Don't focus only on the monthly payment. A lower payment often means a longer loan and far more total interest. Always check the total cost column.
• Include taxes and fees. Sales tax can add 5–10% to the vehicle price, and dealer fees ($500–$2,000) are often rolled into the loan — increasing interest paid.
• Your credit score dramatically affects your rate. Going from 9% to 5% APR on a $25,000 loan saves over $3,000. Get pre-approved from a bank or credit union before visiting a dealer.
• Put more down when possible. A 20% down payment keeps loan-to-value ratio healthy and may unlock better rates while reducing total interest.
• Watch out for 72 and 84-month loans. They feel affordable but cars depreciate faster than you pay down the loan — meaning you could owe more than the car is worth (being "underwater").

Frequently Asked Questions

What's a good interest rate for a car loan?

As of 2024, rates for new car loans for borrowers with excellent credit (720+) typically range from 5–7% APR. Used car loans run 1–3% higher due to greater lender risk. If you're seeing rates above 12%, it's worth checking your credit score and exploring credit union pre-approval before accepting a dealership offer.

Should I put more money down on a car?

Generally, yes. A larger down payment reduces the amount you finance, which lowers both your monthly payment and total interest paid. It also protects against being "underwater" on the loan — owing more than the car is worth. Financial advisors often suggest 10–20% down on a new car.

How does a trade-in affect my car loan?

A trade-in reduces the amount you need to finance, similar to a down payment. If your trade-in is worth $8,000 and you're buying a $30,000 car, you only finance $22,000 (minus any other down payment). Always get a trade-in appraisal separately from negotiating the new car price.

Is it better to get a shorter or longer loan term?

Shorter loans (36–48 months) cost significantly less in total interest and ensure you build equity in the vehicle faster. Longer loans (60–84 months) reduce monthly payments but cost thousands more over time and risk leaving you underwater. Choose the shortest term you can comfortably afford.