Financing Auto Calculator

Use this auto financing calculator to estimate your monthly payments, total interest, and loan cost when purchasing a car. Simply enter the loan amount, interest rate, and term to get an instant calculation.

How to Use This Calculator

To use the auto financing calculator:

Enter the loan amount (the price of the car you're financing)
Enter the annual interest rate (APR) offered by the lender
Select the loan term in years (typically 3-7 years)
Click Calculate to see your estimated monthly payment

The calculator will display your monthly payment, total interest paid, and total loan cost. You can also view a payment schedule chart.

Formula Explained

The auto loan calculator uses the standard amortization formula for loan payments:

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 pay off the loan over the selected term.

Worked Example

Let's calculate the monthly payment for a $25,000 car loan at 5% APR over 5 years:

Given:
Loan amount (P) = $25,000
Annual interest rate = 5%
Loan term = 5 years

First, convert the annual rate to a monthly rate:

Monthly interest rate (i) = 5% ÷ 12 = 0.4167% or 0.004167

Next, calculate the number of payments:

Number of payments (n) = 5 × 12 = 60

Now plug these values into the formula:

M = 25,000 [ 0.004167(1 + 0.004167)^60 ] / [ (1 + 0.004167)^60 - 1 ] M ≈ $454.24

So the estimated monthly payment would be $454.24.

Comparison Table

Here's how different loan terms affect your monthly payment for a $25,000 loan at 5% APR:

Loan Term	Monthly Payment	Total Interest	Total Cost
3 years	$783.64	$2,206.00	$27,206.00
4 years	$635.60	$3,382.00	$28,382.00
5 years	$454.24	$4,534.00	$29,534.00
6 years	$361.17	$5,720.00	$30,720.00
7 years	$298.56	$6,934.00	$31,934.00

Shorter loan terms result in higher monthly payments but lower total interest. Longer terms mean lower monthly payments but higher total interest.

Frequently Asked Questions

What is the difference between APR and interest rate?

APR (Annual Percentage Rate) is the total annual cost of borrowing, including all fees and interest. The interest rate is just the portion of APR that represents pure interest. APR is always higher than the interest rate.

How do down payments affect my loan?

A larger down payment reduces your loan amount, which lowers your monthly payments and total interest. However, you'll pay more upfront. The optimal down payment depends on your financial situation and the car's value.

What happens if I miss a payment?

Missing payments can result in late fees, higher interest charges, and potential damage to your credit score. Some lenders may also require you to pay the missed amount plus penalties immediately.