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Auto Loan Calculator Autotrader

Reviewed by Calculator Editorial Team

This auto loan calculator helps you estimate your monthly payments when purchasing a car through Autotrader. Simply enter your loan amount, interest rate, and loan term to get an accurate payment estimate.

How to Use This Calculator

Using our auto loan calculator is simple:

  1. Enter the total loan amount you need to borrow
  2. Input your annual interest rate (APR)
  3. Select the loan term in years
  4. Click "Calculate" to see your estimated monthly payment

The calculator will display your monthly payment, total interest paid, and total amount paid over the life of the loan.

Formula Used

The monthly payment for an auto loan is calculated using the standard loan payment formula:

M = P [ i(1 + i)^n ] / [ (1 + i)^n - 1 ] Where: M = Monthly payment P = Principal loan amount i = Monthly interest rate (annual rate divided by 12) n = Number of payments (loan term in years multiplied by 12)

This formula accounts for the interest on the loan and calculates the equal monthly payments needed to pay off the loan.

Worked Example

Let's calculate a monthly payment for a $25,000 loan at 4.5% APR over 5 years:

  1. Principal (P) = $25,000
  2. Annual interest rate = 4.5% or 0.045
  3. Monthly interest rate (i) = 0.045/12 = 0.00375
  4. Number of payments (n) = 5 years × 12 = 60 months

Plugging these values into the formula:

M = 25000 [ 0.00375(1 + 0.00375)^60 ] / [ (1 + 0.00375)^60 - 1 ] M ≈ $456.24

So your estimated monthly payment would be $456.24.

Frequently Asked Questions

How accurate is this auto loan calculator?

This calculator provides an estimate based on the standard loan payment formula. Actual payments may vary slightly due to rounding and other factors.

Does this calculator work with Autotrader's specific loan terms?

Yes, this calculator uses the same standard loan payment formula that Autotrader and most lenders use to calculate auto loan payments.

Can I use this calculator for refinancing?

Yes, you can use this calculator for both new auto loans and refinancing scenarios by entering the appropriate loan amount and terms.