Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Monthly payment
$614.38
Amount financed
$30,880
Total interest
$5,983
Sales tax
$2,080
Total cost of the vehicle
$40,863
Annual payments
$7,373
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter vehicle price ($).
- 2Enter down payment ($).
- 3Enter trade-in value ($).
- 4Enter sales tax rate (%).
- 5Enter fees (doc, title, registration) ($).
- 6Enter apr (%).
- 7Enter term (months).
- 8Read your monthly payment on the right — it updates as you type.
- 9Hit Share to keep the scenario or send it to someone.
About this calculator
Dealers negotiate on payment, not price, because stretching a loan from 60 to 84 months hides thousands in interest behind a smaller number.
Worked example
Using the values the calculator loads with:
Inputs
- Vehicle price: 32000 $
- Down payment: 4000 $
- Trade-in value: 0 $
- Sales tax rate: 6.5 %
- Fees (doc, title, registration): 800 $
- APR: 7.2 %
- Term (months): 60
Results
- Monthly payment: $614.38
- Amount financed: $30,880.00
- Total interest: $5,982.74
- Sales tax: $2,080.00
- Total cost of the vehicle: $40,862.74
- Annual payments: $7,372.55
What each field means
Inputs
- Vehicle price ($)
- The vehicle price used in the calculation, measured in $. Starts at 32000 $ so you have a working example on load.
- Down payment ($)
- The down payment used in the calculation, measured in $. Starts at 4000 $ so you have a working example on load.
- Trade-in value ($)
- The trade-in value used in the calculation, measured in $. Starts at 0 $ so you have a working example on load.
- Sales tax rate (%)
- The sales tax rate used in the calculation, measured in %. Starts at 6.5 % so you have a working example on load. Accepted range: 0–15 %.
- Fees (doc, title, registration) ($)
- The fees (doc, title, registration) used in the calculation, measured in $. Starts at 800 $ so you have a working example on load.
- APR (%)
- The apr used in the calculation, measured in %. Starts at 7.2 % so you have a working example on load.
- Term (months)
- The term (months) used in the calculation. Starts at 60 so you have a working example on load. Accepted range: 12–96.
Results
- Monthly payment
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Amount financed
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total interest
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Sales tax
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Total cost of the vehicle
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Annual payments
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the auto loan payment calculator work?
Dealers negotiate on payment, not price, because stretching a loan from 60 to 84 months hides thousands in interest behind a smaller number. The underlying maths is: Payment = P × r ÷ (1 − (1 + r)^−n), where r is the monthly rate.
What do I need to enter?
7 values: vehicle price, down payment, trade-in value, sales tax rate, fees (doc, title, registration), apr, and term (months). Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the monthly payment result mean?
It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Auto Loan Payment Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/auto-loan-payment
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/auto-loan-payment" target="_blank" rel="noopener">Auto Loan Payment Calculator — RevenueLab</a> (2026).</p>
Source: [Auto Loan Payment Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/auto-loan-payment) (2026).