Car Loan Calculator Widget

Add a car loan calculator to your website. Buyers enter the vehicle price, down payment, trade-in, sales tax, fees, interest rate and term, and see the monthly payment, the amount financed, the total interest and what the car really costs.

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<iframe src="https://a2z.tools/embed/w/car-loan-calculator" title="Car Loan Calculator by A2Z Tools" width="100%" height="880" style="border:0;width:100%" loading="lazy" allow="clipboard-write"></iframe>

A plain iframe. Works everywhere, including site builders that strip scripts. Adjust height if your content needs more room.

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How it works

The payment uses the reducing-balance (annuity) formula from the A2Z calculator engine, the same one behind the Auto Loan Calculator and the EMI calculator, with the APR divided by 12 as the monthly rate. Before that, the widget works out what is actually borrowed: price plus sales tax plus fees added to the loan, minus the down payment and trade-in, plus anything still owed on the trade-in (negative equity). Some US states charge sales tax only on the price after the trade-in credit and others on the full price, so a switch covers both. The tax rate is the visitor's entry, because rates differ by state and country. When the down payment and trade-in cover everything, it says no loan is needed instead of showing a zero payment.

Calculation method

  • Sales tax = rate x (price - trade-in) where the trade-in credit applies, else rate x price
  • Amount financed = price + tax + fees - down payment - trade-in + amount owed on the trade-in
  • Monthly payment = P x r x (1 + r)^n / ((1 + r)^n - 1), r = APR / 12 / 100, n = months; at 0% = P / n
  • Total interest = payment x n - P; total cost = price + tax + fees + total interest; money to 2 decimals

Worked examples

New car with a down payment

Inputs: Price 30,000, down 5,000, no trade-in, tax 7%, APR 6.5%, 60 months

Result: Monthly 530.24; financed 27,100; interest 4,714.56; total cost of the car 36,814.56

Tax 2,100 on 30,000; 30,000 + 2,100 - 5,000 = 27,100 at 6.5% / 12 over 60 months.

Trade-in with negative equity

Inputs: Price 30,000, down 3,000, trade-in 8,000 with 2,000 still owed, tax 6% after trade-in, fees 500, APR 7%, 72 months

Result: Monthly 389.06; financed 22,820; tax 1,320; interest 5,192.20

Tax 6% of 22,000 = 1,320; 30,000 + 1,320 + 500 - 3,000 - 8,000 + 2,000 = 22,820.

Rates, taxes and fees change and differ by lender and location - enter your own figures. This is an estimate, not a loan offer.

Limitations

  • Assumes equal monthly payments with monthly compounding from the first month; daily-interest loans, deferred first payments and balloon payments are not modelled.
  • Tax, title, registration and dealer fees are only included as the visitor enters them; the widget knows no local rates.
  • Not a credit decision: the APR a lender offers depends on credit history and the car.
  • Dealer add-ons such as GAP insurance, extended warranties or paint protection raise the amount financed only if the visitor adds them to the fees field.

Where publishers use it

  • Car dealer and used-car listing pages
  • Credit union and bank auto-loan pages
  • Car review and buying-guide blogs
  • Personal-finance sites comparing loan terms

Questions

Is a longer term cheaper?

The monthly payment is lower, but the total interest is higher and the car may be worth less than the loan for longer. Compare 48, 60 and 72 months in the widget.

Does the trade-in reduce sales tax?

It depends on the state or country. The widget applies the credit by default; switch it off where tax is charged on the full price.

What if I still owe money on my trade-in?

Enter the amount owed. It is added to the new loan (negative equity), which increases the payment.

Will the lender's figure match exactly?

It should be very close. Lenders may add their own fees, round differently, charge interest daily or set a different first-payment date.

Is a 0% dealer offer better than a cash rebate?

Run both. A 30,000 car at 0% over 60 months costs 30,000 (500 a month). Taking a 3,000 manufacturer rebate instead and borrowing 27,000 at 6.5% costs 528.29 a month, 31,697.16 in total - so here the 0% incentive wins. With a bigger rebate or a cheaper outside loan the answer can flip.

Is the APR the same as the interest rate?

Not always. Under the US Truth in Lending Act the APR folds certain finance charges into a yearly rate, so it can sit slightly above the note rate. The widget uses whatever figure is entered as the rate that sets the payment, so enter the note rate if the lender quotes both.

What does being upside down on a car loan mean?

Owing more than the car is worth. It is common early in long loans with small down payments, because the car depreciates faster than the balance falls; rolling that shortfall into the next purchase is the negative equity the trade-in field models.

Cite or recommend this tool

If you reference this tool in an article, course or documentation, these formats are ready to copy. They are optional - nothing is added to your site unless you paste it.

A2Z Tools Car Loan Calculator
https://a2z.tools/auto-loan-calculator

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