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Bankrate Calculator Auto Loan

Reviewed by Calculator Editorial Team

Use our Bankrate Calculator Auto Loan to estimate your monthly payments, total interest, and loan cost. This calculator helps you understand how different loan terms affect your repayment.

How the Auto Loan Calculator Works

An auto loan calculator estimates your monthly payments based on the loan amount, interest rate, and loan term. The calculation uses the standard loan payment formula:

Monthly Payment = P × [r(1 + r)^n] / [(1 + r)^n - 1]

Where:

  • P = Principal loan amount
  • r = Monthly interest rate (annual rate divided by 12)
  • n = Number of payments (loan term in years × 12)

The calculator also shows the total interest paid over the life of the loan and the total cost of the loan (principal + interest).

Formula Used

The auto loan calculation follows these steps:

  1. Convert the annual interest rate to a monthly rate by dividing by 12
  2. Calculate the number of monthly payments by multiplying the loan term in years by 12
  3. Apply the loan payment formula to get the monthly payment amount
  4. Multiply the monthly payment by the number of payments to get the total loan cost
  5. Subtract the principal from the total cost to get the total interest

Note: This calculator assumes fixed monthly payments and does not account for prepayment penalties or changing interest rates.

Worked Example

Let's calculate a $25,000 auto loan at 4.5% annual interest for 5 years:

Input Value
Loan Amount $25,000
Annual Interest Rate 4.5%
Loan Term (Years) 5

Using the formula:

  1. Monthly rate = 4.5% ÷ 12 = 0.375% or 0.00375
  2. Number of payments = 5 × 12 = 60
  3. Monthly payment = $25,000 × [0.00375(1 + 0.00375)^60] / [(1 + 0.00375)^60 - 1] ≈ $454.23
  4. Total cost = $454.23 × 60 ≈ $27,253.80
  5. Total interest = $27,253.80 - $25,000 = $2,253.80

So for this example, you would pay approximately $454.23 per month, with a total interest cost of $2,253.80.

Frequently Asked Questions

How accurate is the auto loan calculator?
This calculator provides an estimate based on standard loan formulas. Actual payments may vary slightly due to rounding and lender-specific terms.
Does this calculator account for down payments?
No, this calculator only works with the full loan amount. Subtract your down payment from the vehicle price before using the calculator.
Can I use this for refinancing?
Yes, you can use this calculator for both new loans and refinancing by entering the appropriate loan amount and terms.
What if my interest rate changes?
This calculator assumes a fixed interest rate. If your rate changes, you would need to recalculate with the new rate.