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Car Loan Calculator

Estimate your monthly auto loan payment, total interest, and total cost in seconds.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Enter the vehicle price, your down payment, and any trade-in value.
  2. 2.Type in the APR your lender offers and pick a term (36 to 84 months).
  3. 3.Read your estimated monthly payment, total interest, and total cost of the loan.

About Car Loan Calculator

The Car Loan Calculator gives you an instant, private estimate of what an auto loan will really cost. Type in the vehicle price, your down payment, any trade-in value, the annual percentage rate (APR) offered by your lender, and a repayment term, and the calculator shows your monthly payment, the total interest you will pay, and the total cost of the loan. Everything runs locally in your browser, so none of your financial details are uploaded or stored anywhere.

Unlike a mortgage, auto loans are short — typically three to seven years — so this tool uses month-based terms (36, 48, 60, 72, and 84 months) rather than the 15- and 30-year presets you see for home loans. It also focuses on vehicle-specific inputs: price minus down payment minus trade-in gives the amount you actually finance. There is no property tax, homeowners insurance, or HOA line here, because those do not apply to a car loan. What you see is the pure principal-and-interest payment.

Under the hood the calculator uses the standard fixed-rate amortization formula. Your monthly rate is the APR divided by 12, and the payment is derived from the loan principal, the monthly rate, and the number of monthly payments. When the APR is 0% — common with manufacturer promotional financing — the payment is simply the amount financed divided by the number of months, with no interest at all. Total interest is the sum of every payment minus the amount you borrowed, and total cost is the amount financed plus that interest.

Use it to compare offers side by side: a longer term lowers the monthly payment but almost always raises the total interest you pay over the life of the loan, while a bigger down payment or trade-in shrinks the amount you finance and cuts interest across the board. Adjust any field and the results update in real time, so you can quickly see how a half-point of APR or an extra 12 months changes the numbers.

Remember that the monthly figure here covers principal and interest only. Sales tax, title, registration, documentation fees, gap insurance, and extended warranties are not included and vary by state and dealer, so your out-the-door payment may be higher. This calculator is a planning aid, not a loan quote — always confirm the exact terms with your lender or a licensed financial professional before signing.

Methodology & sources

Monthly payments use the standard fixed-rate amortization formula M = P * r * (1 + r)^n / ((1 + r)^n - 1), where P is the amount financed (vehicle price minus down payment and trade-in), r is the monthly rate (APR / 100 / 12), and n is the number of monthly payments. When r = 0 (0% promotional APR), the payment is P / n. Total interest = (monthly * n) - P; total cost = P + total interest. The calculation assumes a fixed APR, equal monthly payments, and no fees, taxes, or insurance. Estimates are for general information only and are not financial advice.

Frequently asked questions

How is the car loan monthly payment calculated?
It uses the standard fixed-rate amortization formula. The monthly rate is your APR divided by 12, and the payment is principal * r * (1 + r)^n / ((1 + r)^n - 1), where n is the number of monthly payments. At 0% APR the payment is simply the amount financed divided by the number of months.
Does a longer loan term make the car cheaper?
No. A longer term lowers your monthly payment but increases the total interest you pay over the life of the loan, so the car ends up costing more overall. A shorter term costs more per month but less in total interest.
Does this include taxes, registration, and fees?
No. The monthly payment covers principal and interest only. Sales tax, title, registration, documentation fees, and add-ons like gap insurance vary by state and lender and are not included, so your actual payment may be higher.

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