Auto Loan Calculator with Monthly Amortization

This auto loan calculator with monthly amortization schedule helps you determine your monthly payments, total interest paid, and see how your loan balances over time. Simply enter your loan amount, interest rate, and loan term to get started.

How to Use This Calculator

To use this auto loan calculator:

Enter the loan amount (the total amount you're borrowing).
Enter the annual interest rate (APR) as a percentage.
Enter the loan term in years.
Click Calculate to see your monthly payment and amortization schedule.

The calculator will display your monthly payment, total interest paid, and a chart showing how your loan balances over time.

Formula Explained

The monthly payment for an auto loan is calculated using 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 multiplied by 12)

This formula accounts for the interest you'll pay over the life of the loan and ensures your payments cover both the principal and interest.

Worked Example

Let's calculate a monthly payment for a $25,000 loan at 4.5% APR over 5 years (60 months):

Convert annual rate to monthly: 4.5% ÷ 12 = 0.375% or 0.00375 in decimal
Plug values into formula:

Monthly Payment = $25,000 * (0.00375(1 + 0.00375)^60) / ((1 + 0.00375)^60 - 1)
Calculate the result: $25,000 * (0.00375 * 1.00375^60) / (1.00375^60 - 1) ≈ $456.23

Your monthly payment would be approximately $456.23, with a total interest of $3,741.20 over the life of the loan.

Frequently Asked Questions

What is the difference between APR and APY?: APR (Annual Percentage Rate) is the simple annual interest rate, while APY (Annual Percentage Yield) includes compounding interest and fees, giving a more accurate picture of the true cost of borrowing.
How does loan term affect my monthly 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.
What is the loan amortization schedule?: The amortization schedule shows how much of each payment goes toward principal and interest over the life of the loan. It helps you track your progress toward paying off the loan.
Can I pay extra toward my loan?: Yes, paying extra principal can reduce your loan term and total interest paid. The calculator can show you the impact of additional payments.