Auto Loan with Down Payment Calculator

This auto loan calculator helps you estimate your monthly payments when you make a down payment. Simply enter your loan amount, down payment, interest rate, and loan term to see your estimated monthly payment, total interest paid, and total cost of the loan.

How to Use This Calculator

Using this auto loan calculator is simple. Follow these steps:

Enter the total loan amount you're requesting.
Enter the amount you plan to put down as a down payment.
Enter the annual interest rate for your loan.
Select the loan term in years.
Click the "Calculate" button to see your results.

The calculator will display your estimated monthly payment, total interest paid over the life of the loan, and the total cost of the loan including principal and interest.

Formula Used

The calculator uses the standard auto loan payment formula:

M = P [ i(1 + i)^n ] / [ (1 + i)^n - 1 ] Where: M = Monthly payment P = Principal loan amount (Loan amount - Down payment) i = Monthly interest rate (Annual rate / 12) n = Number of payments (Loan term in years × 12)

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

Worked Example

Let's calculate a loan with these parameters:

Loan amount: $25,000
Down payment: $5,000
Annual interest rate: 5%
Loan term: 4 years

The principal amount is $25,000 - $5,000 = $20,000.

Monthly interest rate: 5% ÷ 12 = 0.4167% or 0.004167

Number of payments: 4 × 12 = 48

Using the formula:

M = 20,000 [ 0.004167(1 + 0.004167)^48 ] / [ (1 + 0.004167)^48 - 1 ] M ≈ $432.85

Total interest paid over 4 years: $432.85 × 48 - $20,000 ≈ $2,171.40

Total cost of the loan: $25,000 + $2,171.40 ≈ $27,171.40

Frequently Asked Questions

What is a down payment in an auto loan?

A down payment is the amount of money you pay upfront when purchasing a vehicle. It reduces the loan amount and can lower your monthly payments and total interest costs.

How does a down payment affect my monthly payments?

A larger down payment reduces the principal amount you need to finance, which typically results in lower monthly payments. However, it also means you're paying more upfront out of your own funds.

What is the difference between APR and interest rate?

APR (Annual Percentage Rate) is the total cost of credit including fees, while the interest rate is the cost of borrowing without additional fees. APR is usually higher than the interest rate.