Auto Calculator with Amortization Schedule

This auto loan calculator helps you determine your monthly payments and generate a detailed amortization schedule. Whether you're buying a new or used car, understanding your loan terms is essential for financial planning.

How to Use This Calculator

To use the auto loan calculator:

Enter the loan amount (principal) in dollars.
Select the loan term in years.
Enter the annual interest rate (APR).
Click "Calculate" to see your monthly payment and amortization schedule.

The calculator will display your monthly payment and generate a table showing how your loan balance decreases over time, including interest paid each month.

Formula Used

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

PMT = P × [r(1 + r)ⁿ] / [(1 + r)ⁿ - 1]

Where:

P = Principal loan amount
r = Monthly interest rate (APR ÷ 12 ÷ 100)
n = Number of payments (loan term in years × 12)

The amortization schedule shows how each payment is applied to interest and principal over the life of the loan.

Worked Example

Let's calculate a loan with these parameters:

Loan amount: $25,000
Loan term: 5 years
Annual interest rate: 5%

Using the formula:

Monthly interest rate = 5% ÷ 12 = 0.0041667

Number of payments = 5 × 12 = 60

PMT = $25,000 × [0.0041667(1 + 0.0041667)⁶⁰] / [(1 + 0.0041667)⁶⁰ - 1]

PMT ≈ $454.23 per month

The amortization schedule would show that over 60 months, you would pay approximately $27,254 in total, with $2,254 going to interest.

Interpreting Results

The monthly payment includes both principal and interest. Early payments primarily cover interest, while later payments focus more on the principal.

Key things to look for:

Total interest paid over the life of the loan
How quickly the principal balance decreases
Whether refinancing could save you money

Remember that interest rates and loan terms can change. Always compare multiple offers before committing to a loan.

Frequently Asked Questions

What is an amortization schedule?

An amortization schedule is a table that shows how much of each payment goes toward interest and how much goes toward paying off the principal balance of your loan.

How does the interest rate affect my monthly payment?

A higher interest rate means more of each payment goes toward interest, which increases your total interest paid over the life of the loan and raises your monthly payment amount.

Can I pay extra toward my loan?

Yes, making extra payments can reduce your total interest and pay off your loan faster. The calculator can help you see the impact of additional payments.