Used Auto Loan Calculator Edmunds
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Reviewed by Calculator Editorial Team
This used auto loan calculator helps you estimate your monthly payments, total interest, and loan cost when financing a used vehicle. The calculator follows Edmunds-style loan calculations with standard financial formulas.
How to Use This Calculator
To calculate your used auto loan:
- Enter the purchase price of the used vehicle
- Enter your down payment amount
- Select the loan term in years
- Enter the interest rate (APR)
- Click "Calculate" to see your results
The calculator will show your estimated monthly payment, total interest paid, and total loan cost. You can also view a breakdown of your loan payments over time.
Formula Used
The calculator uses the standard auto loan formula:
Monthly Payment Formula
M = P [i(1 + i)^n] / [(1 + i)^n - 1]
Where:
- M = Monthly payment
- P = Principal loan amount (Purchase price - Down payment)
- i = Monthly interest rate (APR/12/100)
- n = Number of payments (Loan term × 12)
The total interest paid is calculated by multiplying the monthly payment by the number of payments and subtracting the principal loan amount.
Worked Example
Let's calculate a loan for a $15,000 used car with a $3,000 down payment, 4-year term, and 5% APR:
- Principal = $15,000 - $3,000 = $12,000
- Monthly interest rate = 5%/12 = 0.4167%
- Number of payments = 4 × 12 = 48
- Monthly payment = $12,000 [0.004167(1.004167)^48] / [(1.004167)^48 - 1] ≈ $298.50
- Total interest = ($298.50 × 48) - $12,000 ≈ $1,161.60
This example shows you would pay approximately $298.50 per month with $1,161.60 in total interest over the loan term.
Interpreting Results
When you get your loan results, consider these factors:
- Monthly payment: This is your regular payment amount
- Total interest: This shows how much you'll pay in interest over the loan term
- Total loan cost: This is the sum of your principal and total interest
- Loan-to-value ratio: This shows how much of the vehicle's value you're financing
Important Note
These are estimates only. Actual payments may vary based on your lender's specific terms and conditions. Always review your loan documents carefully before signing.
Frequently Asked Questions
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 actual percentage charged on the loan. APR is typically higher than the interest rate.
How does a down payment affect my loan?
A larger down payment reduces your loan amount and monthly payments. It also typically results in a lower interest rate and better loan terms.
What happens if I can't make my payments?
If you can't make payments, contact your lender immediately. They may offer payment plans, loan modifications, or other solutions. Missing payments can damage your credit score and lead to repossession.
Can I refinance my used car loan?
Yes, you can refinance your used car loan to get a lower interest rate or better terms. However, you'll typically need good credit and may have to pay fees or closing costs.