Auto Loan Calculator
Estimate your car payment, total interest, and amount financed after trade-in, taxes, and dealer fees.
These calculators are for informational purposes only and do not constitute financial, legal, or tax advice.
Auto Loan Calculator
Estimate your monthly car payment, total interest, and true cost of financing before you sign anything.
Quick Answer
An auto loan calculator estimates your monthly car payment and total loan cost, in USD ($), based on the vehicle price, down payment, trade-in value, sales tax, loan term, and interest rate. It helps you see how each factor affects your payment before you commit to financing.
Jump to:
How to Use|
The Formula|
Example|
What Affects Payment|
Loan Terms|
Affordability|
APR vs. Rate|
FAQs
How to Use|
The Formula|
Example|
What Affects Payment|
Loan Terms|
Affordability|
APR vs. Rate|
FAQs
Before you sign a financing agreement at a dealership, it helps to know what you’re actually agreeing to pay – not just this month, but over the full life of the loan. An auto loan calculator lets you plug in the numbers from a real offer, or numbers you’re just considering, and see the full picture: your monthly payment, the total interest you’ll pay, and how much the vehicle really costs once financing is factored in.
This calculator estimates your monthly payment, total loan cost, total interest, and the amount actually financed, and shows how a down payment, trade-in, and loan term each change those numbers. Below, we’ll walk through how to use it, the math behind it, and the factors that move your payment up or down.
How to Use the Auto Loan Calculator
| Input | What to Enter |
| Vehicle Price | The full purchase price of the vehicle, before any down payment or trade-in. |
| Down Payment | Cash you’re putting toward the purchase upfront – this directly reduces the amount financed. |
| Trade-In Value | The value your dealer is crediting for a vehicle you’re trading in, if applicable. |
| Sales Tax | Your applicable sales tax rate. The calculator applies this to the price after subtracting your trade-in value, matching how most states calculate it. |
| Interest Rate | The annual interest rate on your loan offer. |
| Loan Term (Years) | How many years you’ll be repaying the loan (this calculator supports 1 to 8 years). |
| Dealer Fees | Documentation, title, and other dealer-added fees that get rolled into (financed as part of) the loan. |
Once you enter these, the calculator returns your estimated Monthly Payment, Total Interest, Total Cost, and the Amount Financed – the actual loan balance after your down payment, trade-in, taxes, and fees are all factored in.
Auto Loan Payment Formula
A standard fixed-rate auto loan payment is calculated with the same formula used for any amortizing installment loan:
M = P × [r(1+r)n] / [(1+r)n − 1]
M = monthly payment
P = principal loan amount (the amount financed)
r = monthly interest rate (the annual rate divided by 12)
n = total number of monthly payments (loan term in years × 12)
In plain terms: the formula finds the fixed monthly amount that pays off the full loan balance, plus all the interest that accrues along the way, in exactly the number of payments in your term. The annual rate you’re quoted gets converted to a monthly rate first, since payments and interest accrue monthly.
Example Auto Loan Calculation
Here’s a realistic example: a $35,000 vehicle, a $5,000 down payment, no trade-in, a 7% sales tax, $500 in dealer fees, a 60-month term, and a 7% interest rate.
| Step | Value |
| Sales tax (7% of $35,000, no trade-in to subtract) | $2,450.00 |
| Amount Financed ($35,000 − $5,000 + $2,450 + $500) | $32,950.00 |
| Estimated Monthly Payment | $652.45 |
| Total of Payments (60 × $652.45) | $39,146.97 |
| Total Interest | $6,196.97 |
| Total Cost (down payment + total payments) | $44,146.97 |
In plain English: after the down payment, taxes, and fees are worked in, you’re actually financing $32,950 – not the full $35,000 sticker price. Over 5 years at 7%, that turns into a monthly payment of about $652.45, with roughly $6,197 of the total amount paid going toward interest rather than the vehicle itself.
What Affects Your Monthly Car Payment?
| Factor | Effect |
| Vehicle price | Higher price increases the amount financed and the payment, all else equal. |
| Down payment | A larger down payment reduces the amount financed, which lowers both the payment and total interest. |
| Trade-in value | Reduces the amount financed and, in most states, the taxable amount as well. |
| Interest rate (APR) | A higher rate increases both the monthly payment and total interest paid. |
| Loan term | A longer term can reduce the monthly payment but increases total interest paid over the life of the loan. |
| Sales tax | Adds to the amount financed if rolled into the loan rather than paid upfront. |
| Dealer and registration fees | Any fees financed into the loan increase the amount financed and the payment. |
| Add-ons rolled into the loan | Extended warranties or other add-ons financed alongside the vehicle increase the loan balance. |
Shorter vs. Longer Auto Loan Terms
Using the $32,950 financed amount from the example above at a 7% rate, here’s how the same loan looks across common terms:
| Term | Monthly Payment | Total Interest |
| 36 months | $1,017.40 | $3,676.41 |
| 48 months | $789.03 | $4,923.38 |
| 60 months | $652.45 | $6,196.97 |
| 72 months | $561.76 | $7,497.06 |
| 84 months | $497.30 | $8,823.52 |
The pattern is consistent: stretching the term out lowers the monthly payment but increases the total interest paid over the life of the loan, since you’re carrying a balance for longer. A shorter term means higher monthly payments but less interest overall. Which trade-off makes sense depends on your monthly budget, how long you plan to keep the vehicle, and your other financial priorities – there’s no universally “right” term.
How Much Car Can I Afford?
This calculator can show you the payment for a given price and loan structure, but affordability is a bigger question than the loan payment alone. Beyond the monthly payment itself, it’s worth budgeting for:
• Insurance – premiums vary significantly by vehicle, driver history, and location
• Fuel – ongoing cost that varies by vehicle efficiency and how much you drive
• Maintenance – routine service and eventual repairs
• Registration – annual or biennial fees that vary by state
• Taxes and fees – beyond what’s rolled into the loan, some costs may be due upfront
• Existing debt – how a new car payment fits alongside what you already owe
• Emergency savings – whether committing to a payment leaves room for unexpected expenses
Qualifying for a loan at a certain amount doesn’t necessarily mean that payment comfortably fits your overall budget – a lender’s approval reflects their underwriting criteria, not a personalized assessment of your full financial picture.
APR vs. Interest Rate
This calculator’s rate field reflects the loan’s interest rate – the base cost of borrowing the principal. APR (Annual Percentage Rate) is a related but different figure: it can incorporate certain additional borrowing costs, such as some fees, into a single annualized rate, which makes it a useful tool for comparing financing offers that have different fee structures.
Exactly which costs get folded into APR can depend on the lender and the specific disclosure rules that apply, so it’s worth comparing the APR figures lenders provide directly rather than assuming every quote treats fees the same way. If you want to estimate a fee-inclusive APR for a loan offer, our APR Calculator is built for that calculation.
Run Your Own Numbers
Enter your vehicle price, down payment, and loan terms above to see your estimated payment.
Down Payment and Trade-In
A down payment and a trade-in both work the same way in this calculator: they reduce the amount you need to finance, dollar for dollar. Using the $35,000 vehicle example, with no trade-in and no down payment (before tax and fees), you’d need to finance $37,950 (after the 7% tax and $500 in dealer fees). Adding a $5,000 down payment reduces that amount financed to $32,950 – a direct $5,000 reduction.
One thing worth double-checking with a trade-in: use the actual trade-in value your dealer is offering, not a rough estimate from an online valuation tool, since dealer offers frequently differ from those figures. If you still owe money on the vehicle you’re trading in, that outstanding balance is typically subtracted from the trade-in credit, which can reduce – or in some cases eliminate – the amount it actually contributes toward your new purchase.
Total Cost of an Auto Loan
It’s easy to focus only on the monthly payment number, but that figure doesn’t tell the whole story. The relationship between the pieces looks like this: your amount financed and interest rate determine your monthly payment; your monthly payment multiplied by the number of payments gives you the total amount paid; and the difference between that total and your amount financed is your total interest.
A lower monthly payment achieved by stretching out the loan term can hide a higher total cost – as shown in the term comparison table above, the 84-month version of the same loan costs over $5,100 more in interest than the 36-month version, even though its monthly payment is roughly half. Looking at total interest and total cost alongside the monthly payment gives a more complete picture.
How to Lower Your Auto Loan Payment
• Make a larger down payment – reduces the amount financed directly
• Choose a less expensive vehicle – lowers the base amount being financed
• Compare lenders – rates and terms can vary between banks, credit unions, and dealer financing
• Improve your credit before applying, when practical – stronger credit profiles are often offered more competitive rates
• Compare APRs, not just advertised rates – helps account for fees when weighing offers
• Consider different loan terms – weigh the monthly payment against total interest
• Avoid unnecessary add-ons – extended warranties and other extras financed into the loan increase the balance
None of these strategies guarantee a specific approval outcome or interest rate – actual offers depend on the lender’s underwriting criteria, your credit profile, and market conditions at the time you apply.
Auto Loan Calculator vs. Car Affordability Calculator
These tools answer related but different questions. An auto loan calculator, like this one, starts with a specific vehicle price and loan structure and tells you the resulting payment. A car affordability calculator typically works the other direction – starting with what you can comfortably pay each month and estimating what vehicle price that supports. A general loan payment calculator covers the same underlying math for any type of installment loan, not just vehicle financing.
If you already have a vehicle and price in mind, this auto loan calculator is the right starting point. If you’re not sure what price range makes sense for your budget yet, an affordability-focused approach – working backward from your monthly budget – is generally more useful.
Frequently Asked Questions
How do I calculate my monthly car payment?
Use the standard loan payment formula with your amount financed, monthly interest rate, and total number of payments, or enter your vehicle price, down payment, trade-in, tax, fees, rate, and term into this calculator to get the estimate automatically.
What is a good auto loan APR?
There’s no single APR that’s universally good or bad – competitive rates depend on your credit profile, the loan term, current market conditions, whether the vehicle is new or used, and the lender. Comparing multiple offers for the same vehicle and term is the most reliable way to judge whether a rate is competitive for your situation.
How much should I put down on a car?
This depends on your savings, budget, and goals – there’s no fixed rule. A larger down payment reduces the amount financed and can lower both your monthly payment and total interest, but the right amount depends on your overall financial situation.
Is a 60-month or 72-month car loan better?
Neither is universally better. A 60-month loan generally has a higher monthly payment but less total interest than a 72-month loan on the same amount and rate. The better choice depends on your monthly budget and how much total interest you’re comfortable paying.
Does a larger down payment reduce interest?
Yes. A larger down payment reduces the amount financed, and since interest is calculated on that balance, a smaller financed amount generally results in less total interest paid over the loan, all else being equal.
How does my credit score affect an auto loan?
Generally, stronger credit profiles are offered more competitive interest rates, since lenders view them as lower risk. Exact pricing varies by lender, loan term, and market conditions, so there’s no fixed rate tied to any specific credit score.
Are taxes and fees included in a car loan?
They can be, if you choose to finance them rather than pay them upfront. This calculator lets you include sales tax and dealer fees in the amount financed, which increases your loan balance and payment compared to paying those costs out of pocket. Tax treatment varies by state and transaction.
How much interest will I pay on a $30,000 car loan?
It depends on your rate and term. For example, a $30,000 loan at 7% over 60 months would generate an estimated $5,642.16 in total interest, with a monthly payment of about $594.04. Your actual figures will depend on your specific rate, term, and financed amount.
Can I pay off my auto loan early?
Many auto loans allow early payoff without penalty, which can reduce your total interest paid, but terms vary by lender. Check your specific loan agreement for any prepayment penalty before assuming you can pay it off early at no extra cost.
Does refinancing an auto loan reduce the monthly payment?
It can, if you refinance into a lower interest rate or a longer term, though a longer term may increase total interest even as it lowers the monthly payment. Whether refinancing makes sense depends on your current loan terms, your updated credit profile, and current market rates.
Related Calculators
See Your Estimated Car Payment
Enter your vehicle price, down payment, trade-in, and loan terms above to get your full breakdown.
This calculator provides estimates for general educational and planning purposes only and is not a loan offer or guarantee of approval or terms. Actual payments can vary based on lender terms, taxes, fees, your credit profile, and other factors, and tax rates vary by state and transaction. Consult your lender’s official loan disclosures and a licensed financial professional before making borrowing decisions.