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Edmunds Auto Finance Calculator

Reviewed by Calculator Editorial Team

This Edmunds Auto Finance Calculator helps you determine your monthly auto loan payments, total interest paid, and other key financial metrics. Whether you're shopping for a new car or refinancing an existing loan, this tool provides clear insights into your auto financing options.

How to Use This Calculator

Using this calculator is simple. Follow these steps:

  1. Enter the loan amount you're seeking (the price of the vehicle).
  2. Input the annual percentage rate (APR) offered by the lender.
  3. Specify the loan term in years.
  4. Enter any down payment amount if applicable.
  5. Click "Calculate" to see your results.

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

Formula Explained

The auto loan payment is calculated using the standard loan payment formula:

Loan Payment Formula

M = P [ i(1 + i)^n ] / [ (1 + i)^n - 1 ]

Where:

  • M = Monthly payment
  • P = Principal loan amount (loan amount - down payment)
  • i = Monthly interest rate (APR divided by 12)
  • n = Number of payments (loan term in years × 12)

This formula accounts for the interest charged on the outstanding loan balance each month, creating an amortizing loan where each payment applies to both principal and interest.

Worked Example

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

  1. Principal (P) = $25,000
  2. Monthly interest rate (i) = 4.5% ÷ 12 = 0.375% or 0.00375
  3. Number of payments (n) = 5 × 12 = 60

Plugging these values into the formula:

Calculation

M = $25,000 [ 0.00375(1 + 0.00375)^60 ] / [ (1 + 0.00375)^60 - 1 ]

M ≈ $25,000 [ 0.00375 × 1.245 ] / [ 1.245 - 1 ]

M ≈ $25,000 [ 0.0046 ] / 0.245

M ≈ $25,000 × 0.01875

M ≈ $468.75

So, the monthly payment would be approximately $468.75.

Frequently Asked Questions

What is the difference between APR and interest rate?
APR (Annual Percentage Rate) is the total annual cost of credit, including fees and points, while the interest rate is the actual percentage charged on the loan amount. APR is always higher than the interest rate.
How does a down payment affect my monthly payment?
A larger down payment reduces the principal amount you need to finance, which typically results in lower monthly payments. However, it also means you pay more upfront in cash.
What happens if I make extra payments on my auto loan?
Extra payments reduce the principal balance faster, lowering the total interest paid over the life of the loan. They may also qualify you for loan payoff incentives from the lender.