Auto Loan Calculator

Calculate your exact monthly car payment. See how down payments, trade-ins, and sales tax affect your total financing cost.

Auto Loan Payment Calculator

Vehicle Details

Fields marked with an asterisk () are required.

Enter the negotiated price of the vehicle

Initial Payments

Enter the value of your trade-in vehicle

Enter your cash down payment


Financing Details

Loan Terms and Taxes

Select the length of the loan in months

Enter the annual interest rate

Enter your local auto sales tax rate

Estimated Monthly Payment

$0
Net Vehicle Financed$0
Sales Tax Financed$0
Total Interest Paid$0

Total Financed

$0

Total Cost (Inc. Interest)

$0

The Math Behind Auto Loans

functions

Amortization Equation

Just like a mortgage, auto loans are calculated using a standard amortization formula. The key difference is that the loan term (n) is expressed in months rather than years.

A=P×
r(1 + r)ⁿ(1 + r)ⁿ - 1

Variables

  • A
    Monthly PaymentYour scheduled auto payment
  • P
    Total FinancedPrice + Tax - Down - Trade
  • r
    Monthly InterestAnnual rate ÷ 12
  • n
    Number of Monthse.g. 60 or 72 months

Built on Industry Standards

Calculations mirror the standard amortization software used in dealership Finance & Insurance (F&I) offices nationwide.

*Disclaimer: This tool is for educational and estimating purposes only. It does not constituent financial, dealership, or tax advice. Actual loan terms, dealer fees, and title/registration costs will vary based on your lender and location.

Frequently Asked Questions

How does a trade-in affect my auto loan?expand_more

Trading in your current vehicle can significantly reduce your auto loan in two ways.

First, the value of the trade-in is deducted directly from the purchase price of your new car, lowering the total amount you need to finance. Second, in most states, the trade-in value is deducted before sales tax is calculated, which lowers your total tax bill.

Should I finance through the dealership or my own bank?expand_more

It is almost always best to get pre-approved for an auto loan from a bank or credit union before going to the dealership.

Dealerships often mark up interest rates as a way to make extra profit. Having a pre-approval letter gives you negotiating power; you can ask the dealer to beat your bank's rate. If they can't, you simply use your pre-approved financing.

How does the Health Badge work?expand_more

Our dynamic Health Badge analyzes your inputs in real-time based on industry best practices:

  • Loan Term: Terms of 72 months or longer are flagged as High Risk because vehicles depreciate faster than you build equity.
  • Interest Rate: Rates above 10% are flagged because they drastically inflate the total cost of ownership.
  • Down Payment: We check if you are putting at least 10% down to protect you from being 'upside-down' on your loan.
What is a good auto loan interest rate?expand_more

A 'good' auto loan interest rate depends heavily on your credit score and whether the car is new or used. Typically, new cars qualify for lower interest rates than used cars.

Borrowers with Excellent credit (780+) often see rates between 4% and 6% on new cars. Borrowers with Subprime credit might see rates of 15% or higher. Checking rates with local credit unions is often the best way to find competitive options.