Financial Calculators / Free Tools
Free Auto Loan Calculator Online
Use this free auto loan calculator to estimate your monthly car payment, total interest, and total cost - including down payment, trade-in value, sales tax, and extra fees. No sign-up required.
What is an auto loan calculator and why it matters
An auto loan calculator estimates your monthly car payment by combining the vehicle price, any down payment or trade-in credit, sales tax, fees, the loan term, and the interest rate into one amortized loan amount. This matters because the "amount financed" on a car loan is often different from the sticker price once tax, fees, down payment, and trade-in are factored in - and that financed amount, not the sticker price, is what actually determines your monthly payment and total interest.
How this calculator works
The calculator first works out the amount you'll actually finance: vehicle price, minus down payment, minus trade-in value, plus sales tax (calculated on price minus trade-in) and any title, registration, or dealer fees you add to the loan. That financed amount is then run through the standard loan amortization formula along with your interest rate and chosen term to produce a fixed monthly payment, then multiplies that payment by the number of months to show total interest and total loan cost.
Common searches this calculator answers
- What will my monthly car payment be?
- How does a trade-in affect my auto loan payment?
- How much interest will I pay over the life of a car loan?
- How does sales tax affect the amount I finance?
- What loan term gives the lowest monthly payment?
How to use it
- Enter the vehicle price and your planned down payment.
- Enter your trade-in value, if any (enter 0 if you don't have one).
- Enter estimated title, registration, and other fees you plan to roll into the loan.
- Enter your state's sales tax rate and the interest rate (APR) you expect to qualify for.
- Choose your loan term from the dropdown.
- Click Calculate payment to see your monthly payment, total interest, total cost, and a full purchase breakdown.
Tips
- A longer loan term lowers your monthly payment but increases total interest paid - compare a couple of term lengths before deciding.
- A larger down payment reduces the amount financed directly, which lowers both your payment and total interest.
- Get your interest rate estimate from a real pre-approval when possible - rates vary significantly based on credit score, loan term, and new vs. used vehicle.
- Rolling fees and taxes into the loan means you pay interest on them too - paying some of that upfront in cash reduces total interest over the loan.
Frequently asked questions
Is this auto loan calculator free to use?
Yes. It is completely free, works in your browser, and does not require any sign-up or download.
Does this include sales tax and fees in the loan amount?
Yes, by default it adds sales tax and any fees you enter to the amount financed, which matches how most dealers structure a car loan unless you pay those amounts in cash upfront.
How is sales tax calculated here?
This calculator applies your entered tax rate to the vehicle price minus your trade-in value, which is a common approach in many states. Some states tax the full price regardless of trade-in, so check your local rule if you want an exact figure.
Why does a shorter loan term have a higher monthly payment but lower total cost?
The same loan amount is paid off faster with a shorter term, so more of each payment goes to principal and less time is spent accruing interest, which reduces total interest even though each individual payment is larger.
Can I use this for a used car loan?
Yes. The calculation works the same way for new or used vehicles - just enter the actual price and applicable interest rate for the loan you're evaluating, since used car rates are often higher than new car rates.
