Auto Loan Calculator
Calculate your monthly car loan payments, total interest, and total cost. Compare different loan terms, interest rates, down payments, and trade-in values to find the best financing option for your next vehicle.
How Auto Loan Calculations Work
Auto loans are typically simple interest loans, meaning interest is calculated daily on the remaining principal balance. Your monthly payment goes toward both interest charges and principal reduction. Early payments primarily cover interest, while later payments focus more on principal.
Monthly Payment Formula:
M = P × [ r(1 + r)n ] / [ (1 + r)n − 1 ]
Where:
M = Monthly payment
P = Principal (Loan amount after down payment and trade-in)
r = Monthly interest rate (Annual rate ÷ 12)
n = Total number of payments (Loan term in months)
This calculator also shows you the total interest paid and the total cost of the loan, helping you make informed financing decisions. You can compare different loan terms, interest rates, and down payments to find the best option for your budget.
Tips for Getting the Best Auto Loan
- Improve Your Credit Score: A higher credit score qualifies you for lower interest rates. The difference between a 5% and 10% rate on a $30,000 loan over 60 months is over $4,000 in extra interest!
- Make a Larger Down Payment: Every $1,000 extra down payment reduces your loan amount and total interest paid. A 20% down payment is ideal.
- Choose a Shorter Loan Term: While monthly payments are higher, you'll pay significantly less interest. Compare a 48-month vs 72-month loan on $25,000 at 6%: 48 months ($587/month, $3,176 interest) vs 72 months ($414/month, $4,808 interest).
- Consider Refinancing: If interest rates drop or your credit improves, refinancing can lower your monthly payment and total interest.
❓ Auto Loan Calculator FAQ
What credit score do I need for a good auto loan rate?
• 740+ (Excellent): 4-6% APR
• 700-739 (Good): 6-8% APR
• 660-699 (Fair): 8-12% APR
• Below 660: 12-20%+ APR
Should I get pre-approved before visiting a dealership?
Yes! Getting pre-approved from your bank or credit union gives you negotiating power. Dealers often mark up interest rates to earn profit. Compare our calculator results with dealer offers.
How much car can I afford?
Financial experts recommend spending no more than 10-15% of your monthly take-home pay on car payments, and total vehicle expenses (payment + insurance + maintenance) under 20% of your income.
What is the difference between APR and interest rate?
APR (Annual Percentage Rate) includes interest plus fees. The interest rate is purely the cost of borrowing. Use APR for true loan cost comparison.
Can I pay off my auto loan early?
Most auto loans have no prepayment penalties. Paying extra each month reduces principal faster and saves significant interest. Even $50 extra per month can shorten your loan by months and save hundreds in interest.
What is the difference between a secured and unsecured auto loan?
A secured auto loan uses the vehicle as collateral. If you default, the lender can repossess the car. Unsecured loans don't require collateral but typically have higher interest rates and stricter approval requirements.
How does my down payment affect my auto loan?
A larger down payment reduces the loan amount, which lowers your monthly payment and total interest paid. It also reduces the risk of being "upside down" (owing more than the car is worth).
What is a trade-in and how does it affect my loan?
A trade-in is the value of your current vehicle applied toward the purchase of a new one. It reduces the loan amount, similar to a down payment, and can lower your monthly payments.
What is the difference between a 48-month and 72-month auto loan?
A 48-month loan has higher monthly payments but lower total interest. A 72-month loan has lower monthly payments but significantly more total interest. Choose the shortest term you can afford to save money.
How do I calculate my monthly auto loan payment?
Use the formula: M = P × [r(1+r)^n] / [(1+r)^n − 1]. Or simply use this calculator — enter your vehicle price, down payment, trade-in, interest rate, and loan term to get your monthly payment instantly.
What is the average auto loan interest rate?
As of 2025, average auto loan rates range from 4-6% for excellent credit, 6-8% for good credit, 8-12% for fair credit, and 12-20%+ for poor credit. Rates vary by lender, loan term, and vehicle age.
Should I finance through the dealer or my bank?
Compare offers from both. Dealers may offer promotional rates, but banks and credit unions often have competitive rates. Getting pre-approved gives you leverage to negotiate a better deal at the dealership.
What is negative equity in an auto loan?
Negative equity (being "upside down") means you owe more on your loan than the vehicle is worth. This happens when the car depreciates faster than you pay down the loan. A larger down payment and shorter loan term help avoid this.
How does the loan term affect my monthly payment?
A longer loan term spreads the payments over more months, lowering your monthly payment but increasing total interest. A shorter term raises your monthly payment but saves you money on interest.
What is an amortization schedule?
An amortization schedule shows each payment's breakdown between principal and interest over the life of the loan. Early payments are mostly interest; later payments are mostly principal. This calculator can display the full schedule.
Can I use this calculator for leasing?
No, this calculator is designed for auto loans (financing a purchase). Leasing is a different type of agreement with different calculations. Please use our dedicated lease calculator for leasing calculations.
What is the difference between simple interest and compound interest in auto loans?
Auto loans use simple interest — interest is calculated only on the remaining principal balance. Compound interest would add interest to the principal, but auto loans don't work that way. This makes auto loans more straightforward to calculate.
How do I get the best auto loan rate?
Improve your credit score, save for a larger down payment, choose a shorter loan term, shop around with multiple lenders, and consider getting pre-approved before visiting the dealership.