Auto Loan Calculator – Estimate Your Car Payment
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What Is an Auto Loan Calculator?
An auto loan calculator estimates your monthly car payment by factoring in the vehicle price, down payment, trade-in value, sales tax, interest rate, and loan term — giving you a realistic number before you visit the dealership.
Formula Used
Loan Amount = Vehicle Price − Down Payment − Trade-in Value + Sales Tax
M = P × [r(1+r)^n] / [(1+r)^n − 1]
Where M is the monthly payment, P is the financed loan amount, r is the monthly interest rate (annual rate ÷ 12), and n is the number of monthly payments.
How to Use This Calculator
Enter the vehicle's price, your down payment, any trade-in value, the sales tax rate in your state, the interest rate offered, and your loan term in months. Click "Calculate Payment" to see your estimated monthly payment and total loan cost.
Tips for Getting a Better Auto Loan
Shorter loan terms mean higher monthly payments but significantly less interest paid overall. A larger down payment or trade-in reduces your financed amount directly, lowering both your payment and total interest. Compare rates from your bank, credit union, and dealer financing before signing.
Frequently Asked Questions
Does sales tax get added to the loan amount?
In most states, yes — sales tax is typically financed as part of the loan unless paid upfront in cash.
Is a longer loan term ever a good idea?
It can lower your monthly payment, but you'll pay more in total interest and risk being "underwater" (owing more than the car is worth) for longer, since cars depreciate quickly.
How does trade-in value affect my payment?
Your trade-in value is subtracted directly from the amount you need to finance, reducing both your monthly payment and total interest.
What's a typical auto loan interest rate?
Rates vary based on credit score, loan term, and whether the car is new or used, generally ranging from around 5% to 15%+.