Auto Loan Calculator – Estimate Your Monthly Car Payment
Our free auto loan calculator helps you estimate your monthly car payment based on the vehicle price, down payment, trade-in value, loan term, and interest rate. Whether you're financing a new or used car, understanding your loan details before visiting the dealership can save you thousands of dollars. Enter your numbers below to instantly see your estimated monthly payment and total interest costs.
The total purchase price of the vehicle before any down payment or trade-in.
The amount you pay upfront. A larger down payment reduces your loan amount and monthly payment.
The estimated value of your current vehicle if you are trading it in.
The length of the loan in months. Longer terms mean lower monthly payments but more interest paid overall.
The annual percentage rate (APR) offered by your lender. Check with your bank or dealership for your rate.
Your state or local sales tax rate applied to the vehicle purchase price.
Any additional fees such as registration, documentation, or dealer fees to be rolled into the loan.
Your results will appear here
How to Use This Calculator
1. Enter the Vehicle Price — type in the full purchase price of the car you want to buy. 2. Add a Down Payment — enter any amount you plan to pay upfront to reduce your loan balance. 3. Enter Trade-In Value — if you're trading in an existing vehicle, enter its estimated value. 4. Select Loan Term — choose from 24 to 84 months; shorter terms cost less in interest but have higher monthly payments. 5. Enter Your APR — input the annual interest rate offered by your lender or bank. 6. Add Sales Tax and Fees — optionally include your local sales tax rate and any dealer or documentation fees. 7. View Your Results — the calculator instantly shows your monthly payment, total interest paid, and total loan cost.
How Is a Monthly Auto Loan Payment Calculated?
Your monthly auto loan payment is determined by four key factors: the loan principal (amount borrowed), the annual interest rate (APR), and the loan term (number of months). The standard formula used is the amortizing loan payment formula:
M = P × [r(1+r)^n] / [(1+r)^n – 1]
- M = Monthly payment
- P = Principal loan amount
- r = Monthly interest rate (APR ÷ 12 ÷ 100)
- n = Total number of monthly payments (loan term in months)
How Is the Loan Principal Determined?
The total loan amount (principal) is calculated as:
Loan Amount = Vehicle Price + Sales Tax + Fees – Down Payment – Trade-In Value
Reducing the loan principal through a larger down payment or trade-in directly lowers both your monthly payment and total interest paid.
How Does APR Affect Your Payment?
The Annual Percentage Rate (APR) is the yearly cost of borrowing expressed as a percentage. Even a small difference in APR can have a significant impact over the life of a loan. For example, on a $25,000 loan over 60 months, the difference between a 4% and 7% APR is over $2,000 in total interest.
Typical Auto Loan APR Ranges (2024)
- Excellent credit (750+): 3% – 6%
- Good credit (700–749): 5% – 9%
- Fair credit (650–699): 8% – 14%
- Poor credit (below 650): 14% – 25%+
Shorter vs. Longer Loan Terms
Choosing a shorter loan term (e.g., 36 months) results in higher monthly payments but significantly less total interest paid. A longer term (e.g., 72 or 84 months) lowers the monthly payment but increases the total interest cost and the risk of being "underwater" on the loan (owing more than the car is worth).
Tips to Lower Your Auto Loan Cost
- Improve your credit score before applying to secure a lower APR.
- Make a larger down payment to reduce the principal.
- Choose the shortest loan term your budget allows.
- Shop multiple lenders (banks, credit unions, online lenders) before accepting dealer financing.
- Avoid rolling dealer add-ons or extended warranties into the loan.