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Auto & Vehicle

Free car calculators: auto loan payment, car affordability, lease, depreciation, gas mileage (MPG), fuel cost, EV charging cost and tire size — with US examples.

9 calculators Free and online

📌 About Auto & Vehicle

A car is one of the biggest things most Americans buy on credit, and the sticker price is only the start — financing, depreciation, fuel and even tire size all change what you really pay. These calculators cover the whole ownership picture: estimate a monthly loan or lease payment, find out how much car you can actually afford on your budget, see how fast a vehicle loses value, and compare the running cost of gas versus an EV.

Each tool uses the standard formula and a worked example in US dollars, miles and gallons. Use them before you walk into a dealership, when you are deciding between buying and leasing, or to budget the true monthly cost of driving — and treat the financial results as estimates, not financial advice.

  • Estimate a monthly auto loan or lease payment, and check a refinance
  • Find how much car you can afford from your budget and down payment
  • See how much value a car loses to depreciation each year
  • Calculate gas mileage (MPG), trip fuel cost and cost per mile
  • Compare the cost to charge an EV against filling a gas tank
  • Check tire size, overall diameter and speedometer error

🧮 Calculators in this category

Ownership Costs

Car Depreciation Calculator — Value by Year & Total Lost
Estimate how fast your car loses value: see the resale value each year, total dollars lost, and the percentage depreciated over time.
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EV Charging Cost Calculator — Cost to Charge an Electric Car
Find what it costs to charge an electric car: enter battery size, start and target charge, and your electricity rate to get the dollar cost, range added and cost per mile.
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Vehicle Specs

Tire Size Calculator — Diameter, Sidewall & Speedometer Error
Decode any tire code (like 225/45R17) into sidewall height and overall diameter, then compare a new size against your stock tire for speedometer error and fitment.
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Car Financing

Car Affordability Calculator — How Much Car Can I Afford?
Turn a monthly payment you're comfortable with into the maximum car price you can afford — down payment and trade-in included.
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Car Lease Calculator — Estimate Your Monthly Lease Payment
Estimate a monthly car-lease payment from cap cost, residual value, money factor, term and sales tax — the same math dealers use on the lease worksheet.
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Auto Loan Calculator — Monthly Car Payment, Interest & Total Cost
Estimate your monthly car payment, amount financed, total interest, and total cost from price, down payment, trade-in, sales tax, term, and APR.
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Auto Loan Refinance Calculator — New Payment, Monthly Savings & Break-Even
Compare your current car loan to a new rate and term — see your new monthly payment, monthly savings, total interest difference, and how many months to break even on fees.
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Fuel & Mileage

Fuel Cost Calculator — Gas Cost for a Trip or Road Trip
Find the gas cost of any drive: enter the miles, your car's MPG and the price per gallon to see gallons used and total dollars — one way or round trip.
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Gas Mileage Calculator — MPG, Cost Per Mile & L/100km
Find your real gas mileage (MPG) from miles driven and gallons used, plus your cost per mile and a metric L/100km readout.
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📝 Related articles

Read more about this topic on our blog.

How to Calculate Your Car Payment
Your car payment depends on the amount financed, your APR, and the loan term. Here's the formula, a fully worked example with sales tax, and how term length affects total interest.
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Should You Refinance Your Auto Loan?
Refinancing a car loan can cut your rate or quietly trap you in more interest. Here's when it pays off, the break-even on fees, and when to walk away.
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❓ Frequently asked questions

How much car can I afford?

A common guideline is to keep your total car payment under about 10–15% of your take-home pay, with 20% down and a term of 60 months or less. The car affordability calculator works backward from your monthly budget to a max price.

Is it better to lease or buy a car?

Leasing usually means a lower monthly payment but no ownership and mileage limits; buying costs more per month but you keep the car. Compare the lease payment (depreciation + finance charge) against the loan payment for the same vehicle.

How fast does a car depreciate?

A typical new car loses around 20% of its value in the first year and roughly 15% a year after that, so it is worth less than half its sticker price by year five. The depreciation calculator shows the curve for your numbers.

Is an electric car cheaper to run than gas?

Usually yes per mile: charging at home is often $0.04–0.06 per mile versus $0.10–0.15 for gas, though public fast-charging costs more. The EV charging cost calculator compares them for your rates.