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Calculators
Estimate monthly car payments, total interest, and total cost for a vehicle loan. Enter the car price, down payment, loan term, interest rate, and optional trade-in value to plan your purchase.
Follow these simple steps to get instant, accurate results directly in your browser:
Input the sticker purchase price, down payment, and trade-in vehicle allowance.
Set loan term (e.g. 48, 60, 72 months), interest rate (APR), and local sales tax rate.
Inspect your monthly payment, total interest cost, and total purchase outlay.
The Auto Loan Calculator estimates monthly car loan payments, total interest costs, sales tax liabilities, and dealer fees for new and used vehicle purchases.
Automobile financing differs from general personal loans because vehicle purchase contracts frequently involve down payments, trade-in equity allowances, state/local sales taxes, dealer documentation fees, and registration costs. Our calculator incorporates trade-in values and down payments directly into the principal calculation before computing the amortization schedule.
The calculator runs completely client-side in your web browser. You can model dealership financing terms privately without sharing your data.
Disclaimer: This tool is provided for educational and estimation purposes only and does not constitute financial or tax advice. Consult a certified financial advisor or accountant for formal planning.
Net Principal = (Vehicle Price + Tax + Fees) - (Down Payment + Trade-in Allowance)Once Net Principal P is established, the monthly payment M is computed using standard amortization: M = P * [r(1+r)^n] / [(1+r)^n - 1].
Vehicle Price = $32,000 | Down Payment = $5,000 | Trade-in = $3,000 | Sales Tax = 7% ($2,240) Net Financed Principal P = ($32,000 + $2,240) - ($5,000 + $3,000) = $26,240 APR = 5.5% (r = 0.055/12 = 0.004583) | Term = 60 Months Monthly Payment M = $501.37 | Total Paid = $30,082.38 (Total Interest: $3,842.38).
Our calculation methodologies adhere to published guidelines from authoritative government agencies and standards bodies:
Deducts trade-in allowances and cash down payments before computing finance charges.
Accurately models regional vehicle sales tax and dealer document fees.
Compare payments across 36, 48, 60, 72, and 84-month horizons.
Runs on your machine with zero data storage or external transmission.
Walk onto the dealer lot with exact knowledge of your monthly payment and interest costs.
Evaluate the financial trade-offs between a new car with promotional financing versus a cheaper used car.
Understand the hidden interest cost of extending car loans from 48 to 72 or 84 months.
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