Car Loan Calculator
The car loan calculator computes your monthly payment based on the vehicle price, down payment, trade-in value, loan term, and interest rate. It shows the total cost of the vehicle including all interest charges, helping you evaluate financing offers and understand the true cost of different loan terms.
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Calculator
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Formula
M = L × [r(1+r)^n] / [(1+r)^n − 1]; L = Car Price − Down Payment − Trade-In
L is the loan amount (vehicle price minus down payment minus trade-in value). r is the monthly interest rate (APR ÷ 12, as a decimal). n is the loan term in months. Total interest is the sum of all payments minus the loan amount. Total vehicle cost includes all monthly payments plus the down payment and trade-in credit.
How to use the Car Loan Calculator
- 1
Enter your vehicle price
Value should be in $.
- 2
Enter your down payment
Value should be in $.
- 3
Enter your trade-in value
Value should be in $.
- 4
Enter your loan term
- 5
Enter your annual interest rate (apr)
Value should be in %.
- 6
Read your results instantly
Results update in real time as you type.
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Loan term vs. monthly payment trade-off
The most common mistake in car financing is choosing the longest loan term available to minimize the monthly payment. A 72- or 84-month loan makes an expensive car seem affordable month-to-month, but it significantly increases total interest paid and creates a serious risk of being underwater — owing more than the car is worth.
Cars depreciate rapidly, particularly in the first few years. A new car can lose 20-30% of its value in the first year and 50-60% over five years. With an 84-month loan at 7%, you're still paying off a car in years 6 and 7 that may be worth only 30-40% of its original price. If the car is totaled or needs to be sold, you could owe thousands more than insurance or a buyer will pay.
A general rule: finance for no longer than 60 months on a new car and 48 months on a used car. The higher monthly payment is a built-in constraint against buying more car than you can afford.
Understanding APR on auto loans
Auto loan interest rates vary enormously based on your credit score, loan term, lender type, and whether the car is new or used. As of 2025, well-qualified buyers with credit scores above 750 can find new car loans at 5-7% APR, while subprime borrowers may face rates of 15-25%.
Dealer financing is convenient but not always the best rate. Before stepping into a dealership, get pre-approved by your bank or credit union — this establishes a benchmark rate and gives you leverage. Credit unions typically offer rates 1-3% lower than dealer-arranged financing for the same credit profile.
Manufacturer financing deals (0% APR promotions) can be genuine bargains, but they often require sacrificing cash rebates. Do the math: a $2,000 rebate applied to principal vs. 0% financing for 60 months can favor the rebate at higher loan amounts. The break-even depends on your alternative rate.
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Total cost of vehicle ownership
This calculator shows financing costs, but the total cost of ownership includes insurance, fuel, maintenance, registration, and depreciation. These costs vary significantly by vehicle make, model, and your location.
Insurance on a new $35,000 SUV typically runs $1,500-$2,500 annually, while a used economy car might be $900-$1,500. Fuel costs depend on MPG and local gas prices. Maintenance includes oil changes, tires (typically $600-$1,200 every 4-5 years), brakes, and unexpected repairs. Depreciation — the largest cost for new car buyers — isn't a cash outflow but represents real economic loss.
A practical rule for total car costs: keep all vehicle-related expenses (payment, insurance, fuel, maintenance) under 15-20% of your take-home pay. If the financing alone approaches that threshold, the vehicle is likely unaffordable when full costs are included.
Tips & Insights
Negotiate price before discussing financing
Always negotiate the out-the-door price of the vehicle before discussing how you'll finance it. Once a dealer knows you're financing through them, they may focus on monthly payment rather than price — making it easier to obscure the true cost. Agree on the final price first, then discuss financing terms. Use your pre-approved rate as leverage to beat or match dealer financing.
Put at least 20% down on a new car
A 20% down payment on a new vehicle ensures you're not immediately underwater. With zero down on a $35,000 car, you're roughly $5,000-$7,000 upside-down (owe more than the car is worth) from the moment you drive off the lot. A down payment of 20% provides a meaningful equity buffer that protects you if you need to sell or the car is totaled.
Consider certified pre-owned to avoid peak depreciation
A 2-3 year old certified pre-owned (CPO) vehicle has already absorbed the steepest depreciation curve. You may pay 30-40% less than the original MSRP while still getting a manufacturer-backed warranty. CPO vehicles are a strong value compared to brand-new, especially in the current environment where used car prices have stabilized after the pandemic-era spike.
Worked Examples
New SUV with trade-in
Financing $29,000 (after $5,000 down and $8,000 trade-in) at 7% for 60 months yields a monthly payment of about $574. Total interest paid is approximately $5,440, and the total cost of financing the vehicle is $34,440.
Used car at a competitive rate
A $16,000 loan on a used car at 5.5% for 48 months results in a monthly payment of about $371. Total interest is approximately $1,808, making the total financed cost $17,808 — a relatively low financing cost for a reliable used vehicle.
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Frequently Asked Questions
What credit score do I need for a good car loan rate?
The best auto loan rates (often 5-7% as of 2025) are typically reserved for borrowers with credit scores of 720 or above (super-prime). Scores of 660-720 (prime) see rates roughly 2-4% higher. Scores below 580 often face subprime rates of 15-25%+. Improving your credit score before applying — even by 30-40 points — can save thousands in interest over a 60-month loan.
Should I use dealer financing or get my own loan?
Always get pre-approved by your bank or credit union before visiting a dealership. This gives you a baseline rate and removes financing as a negotiating point. Dealer financing can be competitive or even subsidized by the manufacturer (0% deals), but without a competing offer, you have no leverage. Present your pre-approval at the dealership and let them try to beat it.
What is GAP insurance and do I need it?
GAP (Guaranteed Asset Protection) insurance covers the difference between what you owe on the car and what insurance pays out if it's totaled. It's most valuable when you have a small down payment, a long loan term, or a car that depreciates quickly. If you owe $28,000 and the car is worth $22,000 when totaled, GAP covers the $6,000 shortfall. It's generally worth purchasing if your loan-to-value ratio exceeds 100%.
Is it better to lease or buy?
Leasing typically offers lower monthly payments and lets you drive a newer car more frequently, but you never build equity and face mileage limits and wear-and-tear charges. Buying (or financing) builds equity over time and is more economical over a 5-10 year horizon if you keep the vehicle. Leasing makes more financial sense for high-income earners who use the vehicle for business (lease payments may be partially deductible) or those who prioritize driving new models every 2-3 years.
Can I pay off a car loan early without penalty?
Most auto loans have no prepayment penalty, but confirm this before signing. Paying off early saves all future interest charges — since auto loans are amortizing, early payoff is most valuable in the first half of the loan when interest makes up a larger portion of each payment. Even one extra payment per year can shave months off a 60-month loan and meaningfully reduce total interest.
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