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Auto Payment Calculator Excel

Reviewed by Calculator Editorial Team

Calculate your car loan payments, interest, and amortization schedule with this Excel-compatible auto payment calculator. Understand how loan terms affect your monthly payments and total interest costs.

How to Use This Calculator

To calculate your auto loan payments:

  1. Enter the loan amount in dollars
  2. Input the annual interest rate (APR)
  3. Specify the loan term in years
  4. Click "Calculate" to see your monthly payment and total interest

The calculator will show you the monthly payment amount, total interest paid over the life of the loan, and an amortization chart.

Formula Explained

The auto payment calculator uses 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 (APR/12/100) n = Number of payments (loan term in years × 12)

This formula calculates the fixed monthly payment required to fully amortize the loan over the specified term.

Worked Example

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

  1. Monthly interest rate = 4.5%/12 = 0.375%
  2. Number of payments = 5 × 12 = 60
  3. Using the formula: M = $25,000 [ 0.00375(1.00375)^60 ] / [ (1.00375)^60 - 1 ]
  4. This calculates to approximately $472.50 per month
  5. Total interest paid = $472.50 × 60 - $25,000 = $1,350

Excel Implementation

To create this calculation in Excel:

  1. Enter your loan amount in cell A1
  2. Enter your annual interest rate in cell B1 (as decimal, e.g., 0.045 for 4.5%)
  3. Enter loan term in years in cell C1
  4. In cell D1, enter the formula: =PMT(B1/12,A1*12,-A1)
  5. Format cell D1 as currency to display the monthly payment

Note: The PMT function in Excel calculates payments for a loan based on constant payments and a constant interest rate. The order of arguments is important: rate, number of periods, present value.

FAQ

What is the difference between APR and interest rate?
APR (Annual Percentage Rate) is the annual interest rate charged on a loan, while the interest rate is the actual rate applied to your balance. APR includes additional fees and costs.
How does loan term affect my payment?
A longer loan term means lower monthly payments but more total interest paid. A shorter term means higher monthly payments but less total interest.
Can I pay extra toward my loan?
Yes, paying extra principal reduces your balance faster and lowers total interest. Use the amortization schedule to see how extra payments affect your loan.