Car Loan Calculator
Calculate your monthly car payment, total interest, and total cost including down payment and trade-in.
How Car Loan Calculations Work
This calculator determines your monthly auto loan payment using the same formula as any amortizing loan:
M = P[r(1+r)^n] / [(1+r)^n - 1]
The loan amount (P) is calculated as: Vehicle Price + Sales Tax - Down Payment - Trade-in Value.
The total out-of-pocket cost includes the down payment, all monthly payments, and sales tax. Keep in mind that other costs like insurance, registration, maintenance, and fuel are not included in this calculation.
A shorter loan term means higher monthly payments but less total interest paid. A longer term lowers your monthly payment but increases the total amount of interest you pay over the life of the loan.
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Understanding Car Loans
An auto loan is a secured loan used to purchase a vehicle, where the car itself serves as collateral. Car loans are the second most common type of consumer debt after mortgages, with the average new car loan in the United States exceeding $40,000 in 2026. Understanding how auto loans work helps you negotiate better terms and avoid being "upside down" on your loan.
Auto loan terms typically range from 24 to 84 months. While longer terms reduce monthly payments, they dramatically increase total interest and create the risk of negative equity -- owing more than the car is worth. Cars depreciate roughly 20% in the first year and 60% over five years. A 72-month loan on a new car means you could owe more than the car is worth for the first 2-3 years.
Interest rates vary based on your credit score, the loan term, whether the car is new or used, and the lender. In 2026, rates range from about 4.5% for excellent credit on new cars to 15%+ for subprime borrowers on used vehicles. Getting pre-approved from a bank or credit union before visiting a dealership gives you leverage and a benchmark to compare dealer financing against.
Step-by-Step Car Loan Calculation Example
Suppose you buy a $35,000 car with $5,000 down, no trade-in, at 6.5% APR for 60 months:
Step 1: Loan amount = $35,000 - $5,000 = $30,000
Step 2: Monthly rate: r = 6.5% / 12 = 0.005417
Step 3: PMT formula: M = 30,000 x [0.005417 x (1.005417)^60] / [(1.005417)^60 - 1]
Step 4: M = 30,000 x [0.005417 x 1.3829] / [1.3829 - 1] = 30,000 x 0.007492 / 0.3829 = $586.98/month
Total paid: $586.98 x 60 = $35,219 (loan payments) + $5,000 (down) = $40,219 total
Total interest: $35,219 - $30,000 = $5,219 in interest
Smart Car Buying Strategies
Keep the term to 48-60 months: Loans longer than 60 months cost significantly more in interest and put you at risk of negative equity. A $30,000 loan at 6.5% costs $5,219 in interest over 60 months but $7,561 over 72 months -- a $2,342 penalty for lower monthly payments.
Put 20% down: A 20% down payment reduces your loan amount, lowers monthly payments, gets you better interest rates, and significantly reduces the risk of being upside down on the loan. If 20% is not possible, aim for at least 10%.
Consider used over new: A 2-3 year old used car costs 30-40% less than new while still having modern features and remaining factory warranty. The first owner absorbed the steepest depreciation. Certified pre-owned (CPO) vehicles offer additional warranty protection.
Get pre-approved before visiting the dealer: Having a pre-approved loan from a bank or credit union gives you a baseline rate to negotiate against. Dealers may beat your pre-approval to earn the financing business. Never reveal your monthly payment budget to the dealer -- negotiate on total price first.
Car Loan Payment Reference Table
Monthly payments for common loan amounts (60-month term):
| Loan Amount | 4.5% | 6.0% | 7.5% | 10% |
|---|---|---|---|---|
| $15,000 | $280 | $290 | $301 | $319 |
| $20,000 | $373 | $387 | $401 | $425 |
| $25,000 | $466 | $483 | $501 | $531 |
| $30,000 | $559 | $580 | $601 | $637 |
| $40,000 | $746 | $773 | $802 | $850 |
Frequently Asked Questions
How much car can I afford?
The 20/4/10 rule: put at least 20% down, finance for no more than 4 years, and keep total transportation costs (payment, insurance, gas, maintenance) under 10% of gross income. On a $60,000 salary, that means a total car payment under $500/month.
New car vs used car: which is the better deal?
Financially, used cars (2-3 years old) are almost always better. They cost 30-40% less, have lower insurance costs, and someone else absorbed the steepest depreciation. New cars offer the latest features, full warranty, and potentially better financing rates. The best value is usually a certified pre-owned vehicle.
What is negative equity (being "upside down")?
Negative equity means you owe more than the car is worth. This commonly happens with small or zero down payments and long loan terms (72-84 months). If you need to sell or the car is totaled, you must pay the difference out of pocket. Gap insurance can protect against this.
Should I lease or buy?
Leasing offers lower monthly payments and a new car every 2-3 years but you build no equity and face mileage restrictions (typically 10,000-12,000 miles/year). Buying costs more monthly but the car is yours when paid off, and there are no mileage limits. Buying is better financially long-term; leasing suits those who want the latest models.
How does my credit score affect my auto loan rate?
Credit scores dramatically affect rates. Excellent (740+): 4-5%. Good (700-739): 5-7%. Fair (660-699): 7-10%. Poor (below 660): 10-18%+. On a $30,000 loan, the difference between 5% and 12% is over $6,000 in extra interest. Improve your score before buying if possible.
Should I pay off my car loan early?
If there is no prepayment penalty, paying off early saves interest. However, if your rate is low (under 4-5%), you may benefit more by investing the extra money. For rates above 6%, paying off early is usually a good idea. Check that your lender applies extra payments to principal, not future payments.
What extra costs should I budget for beyond the car payment?
Budget for insurance ($100-$300/month), fuel ($150-$300/month), maintenance ($100-$200/month average including tires and repairs), registration ($50-$500/year), and parking (varies by location). Total cost of ownership is typically 1.5-2x the monthly loan payment.
What is gap insurance and do I need it?
Gap insurance covers the difference between what you owe and what your car is worth if it is totaled or stolen. You need it if you put less than 20% down, have a loan term over 60 months, or bought a car that depreciates quickly. Buy it from your auto insurer (much cheaper than dealer gap insurance).