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Auto Loan Calculator 2026 · Monthly Car Payment & Total Interest

Financing a car purchase is one of the most common consumer credit transactions in the United States. According to Experian automotive market reports, the average new car loan in the US exceeds $40,000, while the average used car loan sits near $26,000. With auto interest rates varying significantly based on FICO credit tiers, knowing your exact monthly numbers before stepping into a dealership is critical.
Car dealerships often focus buyers solely on the monthly payment amount, using longer loan terms (such as 72, 84, or even 96 months) to obscure the true total cost of the vehicle. Extending a car loan to 72 or 84 months lowers your monthly installment, but it causes you to pay thousands more in compounding interest and drastically increases the risk of being "underwater" (owing more than the vehicle is worth).
Use this Auto Loan Calculator to compute your monthly car payment, compare 36, 48, 60, and 72-month terms, and factor in your trade-in allowance and cash down payment. We also support 0% APR dealer promotions so you can evaluate special manufacturer incentives accurately.
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When to Use This Calculator

Everyday financial situations where this tool gives you fast, accurate clarity:

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Dealership Negotiation

Know your exact monthly payment and financing costs before stepping into a dealership showroom.

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Loan Term Comparison (48 vs 72 Mo)

See how shorter 48 or 60-month terms prevent negative equity compared to 72 or 84-month loans.

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Trade-In Equity Evaluation

See how your trade-in vehicle lowers your borrowed principal and reduces applicable state sales taxes.

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New Car 0% APR vs. Used Cash Price

Compare dealer 0% promotional financing on new cars against lower purchase prices on certified pre-owned vehicles.

lightbulbFormula & Worked Example

How It Works

Auto loans use fixed-installment amortized interest calculated monthly:\n\n
\nMonthly Payment = P * [ r(1 + r)^n ] / [ (1 + r)^n - 1 ]\n
\n\nWhere:\n* P = Amount financed (Vehicle Price - Down Payment - Trade-In Value)\n* r = Monthly interest rate (APR / 12 / 100)\n* n = Loan term in months (e.g., 36, 48, 60, 72)

Step-by-Step Example

For a $35,000 vehicle with $5,000 cash down and $3,000 trade-in ($27,000 financed) at 6.5% APR over 60 months:\n\n* Monthly payment: $528.27\n* Total interest paid: $4,696.20\n* Total cost including down payment and trade-in: $39,696.20

Frequently Asked Questions

The 20/4/10 rule is a widely recommended US car-buying guideline: put down at least 20% in cash or trade-in equity, finance the vehicle for no longer than 4 years (48 months), and ensure your total vehicle expenses (loan, insurance, and gas) do not exceed 10% of your gross monthly income.
According to Experian, auto loan interest rates vary significantly by credit score: super-prime buyers (781+) average around 5.3% on new cars and 7.1% on used cars, while subprime buyers (under 600) frequently face rates between 14% and 21%.
Guaranteed Asset Protection (GAP) insurance covers the difference between the actual cash value of your car and your remaining loan balance if the car is totaled or stolen. If you put down less than 20% or finance for longer than 60 months, GAP insurance is strongly recommended to protect against negative equity.
Generally, yes. While 72-month and 84-month loans reduce your monthly payment, cars depreciate rapidly (losing ~20% in year one). Long loan terms keep you "underwater" (owing more than the car is worth) for years and cost thousands more in compound interest.
In most US states (over 40 states), the value of your trade-in vehicle is deducted from the purchase price before sales tax is calculated. For example, on a $35,000 car with a $5,000 trade-in and 7% sales tax, you only pay tax on $30,000, saving an instant $350 in taxes.
Yes. Most standard simple-interest auto loans in the United States have no prepayment penalties. Paying extra each month reduces your principal balance and cuts your overall interest charges.

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