Auto Finance

Buying, leasing, or refinancing a vehicle is one of the biggest financial decisions most people make — and one where mistakes are costly. The average new car transaction price exceeds $48,000, and the average monthly payment has topped $700. Our five auto finance calculators help you navigate every stage of vehicle ownership: from determining your budget before stepping onto a lot, to calculating exact monthly payments, comparing lease vs. buy, evaluating refinance opportunities, and projecting ongoing fuel costs. Every calculation runs locally in your browser — no sign-up, no data stored, completely free.

Start with the Car Affordability Calculator to establish a realistic budget based on your income. Then use the Auto Loan Calculator to model different scenarios (price, down payment, term, rate). The Fuel Cost Calculator helps factor in ongoing costs — don't just budget for the payment, budget for the pump.

The Lease vs. Buy Calculator provides a true apples-to-apples comparison over the same time period, accounting for residual value, money factor, and equity. Pair it with the Fuel Cost Calculator if you're comparing vehicles with different MPG ratings — fuel savings can tip the decision.

If your credit score has improved since your original loan, the Auto Refinance Calculator shows exactly how much you can save each month and overall. Even a 2% rate reduction on a $20,000 balance typically saves $1,000-$1,500 over the loan life — with no fees at most lenders.

The sticker price is just the beginning. The total cost of vehicle ownership includes: the purchase price plus tax, title, and fees; financing costs (total interest paid over the loan term); insurance ($1,200-$3,600/year depending on vehicle, location, and coverage); fuel ($1,200-$3,000/year); maintenance and repairs ($900-$1,800/year averaged over the vehicle's life); registration and inspection fees; and the biggest hidden cost — depreciation (a $40,000 new car may be worth just $15,000 after 5 years).

AAA estimates the average cost of new car ownership at $12,182 per year — over $1,000/month when all costs are included. Before buying, calculate the total cost of ownership, not just the monthly payment. Our calculators help you model the financial components so you can make an informed decision.

APR (Annual Percentage Rate): The interest rate plus any fees, expressed as an annual rate. Lower is better. Down payment: Cash paid upfront, reducing the loan amount. 20% is recommended to avoid negative equity. Trade-in: Your current vehicle's value applied toward the new purchase. Term: The loan length in months. 48-60 months is ideal; avoid 72+ months. MSRP: Manufacturer's Suggested Retail Price — the starting point for negotiation. Money factor: The lease equivalent of an interest rate (multiply by 2,400 to get APR). Residual value: The predicted value at lease end, set by the leasing company.

Research the vehicle's invoice price (what the dealer paid) and fair market value on Edmunds or KBB. Get pre-approved for financing before visiting. Always negotiate the total out-the-door price, not the monthly payment. Get quotes from multiple dealers via email before visiting in person. Be prepared to walk away — most sales happen when the customer is ready to leave. Avoid negotiating trade-in and purchase price simultaneously; handle them separately.

At least 20% to avoid negative equity (owing more than the car is worth). For a $35,000 vehicle, that's $7,000 down. If 20% isn't feasible, aim for at least 10% and choose a shorter loan term. Never put $0 down on a depreciating asset unless you're getting 0% financing. If you can't afford 10% down, consider a less expensive vehicle.

Financially, a 2-3 year old certified pre-owned (CPO) vehicle is usually the best value. New cars depreciate 20% in year one and 15%/year after. A $40,000 new car is worth ~$28,000 after 2 years. Buying it as a CPO for $28,000 lets someone else absorb $12,000 in depreciation. CPO vehicles come with extended warranties and multi-point inspections. The sweet spot: 2-3 years old, under 30,000 miles, with CPO warranty.

720+ for the best rates (4-6% currently). 680-719 gets good rates (6-8%). 640-679 is fair (8-12%). Below 640, rates increase significantly (12-25%). Before applying, check your credit report for errors (free at AnnualCreditReport.com), pay down credit card balances below 30% utilization, and avoid opening new accounts. Even 30-50 points of improvement can save thousands over the loan's life.

Pay cash if: you have the money without depleting your emergency fund, and the after-tax return on your savings is below the loan rate. Finance if: you can get a rate below 4-5% and your cash is earning more elsewhere (invested). A hybrid approach works well: make a large down payment (50%+) and finance the rest on a short term. Never drain savings to avoid a 3-4% loan — liquidity has value.