Auto Loan Calculator
Calculate your monthly car payment, total interest, and amortization schedule. Compare auto loan rates and find the best deal on your next vehicle.
For educational purposes only. This calculator does not provide financial advice. Actual loan terms vary by lender.
📊 Visual Analysis
What This Calculator Does
The Auto Loan Calculator computes your monthly car payment, total interest, and total cost based on the vehicle price, down payment, interest rate, and loan term. It uses the standard amortization formula to give you a clear picture of what the loan will cost over its lifetime.
Formula
Where:
- M = Monthly payment
- P = Loan principal (Vehicle Price − Down Payment)
- r = Monthly interest rate = Annual rate ÷ 12 ÷ 100
- n = Total number of monthly payments (loan term in months)
Input Fields Explained
Vehicle Price ($)
The total price of the vehicle before any down payment. Include any dealer-installed options you plan to finance. Exclude taxes, registration, and fees unless you intend to roll them into the loan.
Down Payment ($)
The amount you pay upfront. The loan principal is the vehicle price minus the down payment. A larger down payment reduces both your monthly payment and total interest.
Annual Interest Rate (%)
The annual interest rate quoted by your lender. The calculator converts this to a monthly rate for the amortization formula. Your credit score, loan term, and whether the car is new or used all affect the rate you qualify for.
Loan Term (months)
The repayment period in months. Common terms are 36, 48, 60, 72, and 84 months. Longer terms mean lower monthly payments but more total interest paid over the life of the loan.
Example Calculation
You buy a car for $35,000, put $5,000 down, at 6.5% annual interest for 60 months.
Principal = 35,000 − 5,000 = $30,000
Monthly rate = 6.5 ÷ 12 ÷ 100 = 0.005417
Monthly payment ≈ $587
Total paid = 587 × 60 = $35,220
Total interest = 35,220 − 30,000 = $5,220
How to Read the Result
Your fixed monthly payment for the entire loan term. Ensure this fits within your budget alongside insurance, fuel, and maintenance costs.
The total cost of borrowing over the loan term. Longer terms increase this amount even though they lower the monthly payment.
Common Mistakes
- Focusing only on the monthly payment. Dealers may extend the loan term to hit a target monthly payment, but this costs significantly more in total interest. Always review the total cost, not just the monthly amount.
- Not accounting for insurance, taxes, and fees. The calculator shows loan costs only. Budget separately for auto insurance, registration, sales tax, and maintenance.
- Rolling negative equity into a new loan. If you owe more than your current car is worth, adding that balance to a new loan increases the principal and total interest.
- Ignoring depreciation. Cars lose value quickly, especially in the first few years. A long loan term combined with rapid depreciation can leave you upside-down on the loan.
When This Calculator Is Useful
- Comparing auto loan offers from different lenders
- Determining how much car you can afford
- Evaluating the trade-off between loan term and total cost
- Understanding the impact of a larger down payment
Limitations
- Does not include sales tax, registration, insurance, or dealer fees
- Assumes a fixed interest rate for the entire loan term
- Does not account for prepayment penalties or early payoff scenarios
- Does not consider vehicle depreciation or resale value
- This calculator is for educational purposes only and does not constitute financial advice
Frequently Asked Questions
Should I include dealer fees or extended warranties in the vehicle price?
Finance only what you intentionally decided to borrow. Add taxes and legitimate fees to the price field if they are rolled into the loan; skip optional add-ons you can pay cash for. A higher financed amount raises interest cost even if the monthly payment looks manageable on a long term.
What about 0% APR promotions from the manufacturer?
Zero-percent deals often trade off against rebates — model both paths. If you take 0% but skip a large rebate, your true cost may be higher than a low-rate loan with the rebate applied. Compare total out-of-pocket and total interest using the same vehicle price net of incentives.
How does the down payment affect my loan?
A larger down payment reduces the loan principal, which lowers both your monthly payment and total interest paid. It also reduces the risk of being upside-down on the loan (owing more than the car is worth). Aim for at least 20% down on a new car and 10% on a used car if possible, though any down payment helps.
What is the difference between interest rate and APR?
The interest rate is the cost of borrowing the principal. The Annual Percentage Rate (APR) includes the interest rate plus certain fees and charges, giving a more complete picture of the loan's total cost. APR is typically higher than the interest rate and is useful for comparing loan offers from different lenders.
Should I choose a shorter or longer loan term?
There is no single right answer. Shorter terms have higher monthly payments but lower total interest. Longer terms reduce the monthly payment but increase total interest paid and may leave you owing more than the car is worth for longer. Consider your budget, how long you plan to keep the car, and the total cost of each option.
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Educational Disclaimer
This calculator is for educational and informational purposes only. It does not provide investment, financial, tax, or legal advice. The results are based on the inputs and assumptions you provide and may not reflect real market conditions, fees, taxes, or risks. Always do your own research or consult a qualified professional before making financial decisions.