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Nerdwallet Auto Loans Calculator

Reviewed by Calculator Editorial Team

This NerdWallet Auto Loans Calculator helps you compare different loan options, calculate monthly payments, and determine the best auto loan rates. Whether you're buying a new or used car, this tool provides the information you need to make an informed decision.

How to Use This Calculator

Using this calculator is simple. Just enter the required information in the fields on the right sidebar, then click "Calculate". The calculator will display your estimated monthly payment, total interest paid, and total cost of the loan.

Important Notes

This calculator provides estimates only. Actual loan terms may vary based on your credit score, loan program, and other factors. Always review the loan agreement before signing.

Formula Used

The calculator uses the standard auto loan payment formula:

Monthly Payment Formula

M = P [ i(1 + i)^n ] / [ (1 + i)^n - 1 ]

Where:

  • M = Monthly payment
  • P = Principal loan amount
  • i = Monthly interest rate (Annual rate / 12)
  • n = Number of payments (Loan term in years × 12)

The total interest paid is calculated by subtracting the principal from the total amount paid over the life of the loan.

Worked Example

Let's say you want to finance a $25,000 car with a 4.5% APR over 5 years. Here's how the calculation works:

  1. Principal (P) = $25,000
  2. Annual interest rate = 4.5% or 0.045
  3. Monthly interest rate (i) = 0.045 / 12 = 0.00375
  4. Loan term in months (n) = 5 × 12 = 60

Plugging these values into the formula:

Calculation Steps

M = $25,000 [ 0.00375(1 + 0.00375)^60 ] / [ (1 + 0.00375)^60 - 1 ]

M ≈ $25,000 [ 0.00375 × 1.231 ] / [ 1.231 - 1 ]

M ≈ $25,000 [ 0.00462 ] / 0.231

M ≈ $25,000 × 0.01999 ≈ $499.75

Your estimated monthly payment would be $499.75. Over 5 years, you would pay a total of $29,985, with $4,985 going toward interest.

Tips for Choosing an Auto Loan

When selecting an auto loan, consider these factors:

1. Interest Rates

Lower interest rates save you money over the life of the loan. Compare rates from multiple lenders, including banks, credit unions, and online lenders.

2. Loan Term

Shorter loan terms mean lower monthly payments but higher total interest costs. Longer terms may have lower monthly payments but could cost more in interest over time.

3. Down Payment

A larger down payment reduces the loan amount and can lower your interest rate. However, it also means paying more out of pocket upfront.

4. Credit Score

Your credit score affects the interest rate you qualify for. Improving your credit before applying can help you get a better rate.

5. Fees

Be aware of origination fees, prepayment penalties, and other fees that may apply. These can affect the total cost of the loan.

Frequently Asked Questions

What is the best interest rate for an auto loan?
The best interest rate depends on your financial situation. Generally, rates below 5% are considered good, while rates above 10% may be too high. Always compare rates from multiple lenders.
How does a longer loan term affect my payments?
A longer loan term typically results in lower monthly payments but higher total interest costs. A shorter term may have higher monthly payments but could save you money in interest over time.
What is the difference between APR and interest rate?
APR (Annual Percentage Rate) includes all fees and costs associated with the loan, while the interest rate is the cost of borrowing without fees. APR is usually higher than the interest rate.
Can I pay off my auto loan early?
Yes, many auto loans allow prepayment without penalty. However, check your loan agreement to confirm the terms, as some loans may have prepayment penalties.
How can I improve my chances of getting approved for an auto loan?
To improve your approval odds, maintain a good credit score, make a larger down payment, and shop around for the best loan terms. Lenders may also consider your income and employment history.