Car Ownership Cost Calculator
| Car (new) | 12k miles/yr total | Per mile | Per month |
|---|---|---|---|
| $20,000 economy (30 MPG) | $8,380 | $0.70 | $698 |
| $40,000 mid-range (28 MPG) | $12,480 | $1.04 | $1,040 |
| $70,000 luxury (22 MPG) | $19,189 | $1.60 | $1,599 |
The most expensive lie in personal finance is "the car only costs gas". The honest structure of car ownership: depreciation (about 20% of a new car's price in the first year, quietly the biggest line), insurance, fuel, maintenance and tires at roughly 9 cents a mile, and registration and taxes - and the total lands near $8,400 a year for a $20,000 economy car driven 12,000 miles. That is 70 cents a mile, before you mention parking.
Bottom line: the per-mile number is the one that changes decisions - at about $1.04 a mile for a $40,000 car, the 20-mile round trip to the mall costs $21, and the commute that "only" uses gas is costing hundreds a month in depreciation alone. Enter your own car and miles; the model's assumptions are all visible, so you can argue with any of them.
The honest part: first-year depreciation is the crudest input in the model (real curves flatten after year three), so the calculator prices the expensive early years - which is exactly when the ownership decision happens. Run it again with a 10% depreciation to see the used-car version of the truth.
How to use
- Enter the car price (new or your best estimate of current value), your annual miles, and the car's MPG.
- Read the true cost per mile first - it is the number that reframes every trip - then the annual and monthly totals.
- Compare against the table: the three reference cars bracket the honest range, and the depreciation stat shows how much of your year went to the parking spot's newest occupant.
Frequently asked questions
How much does it really cost to own a car per year?
For a $20,000 economy car driven 12,000 miles: about $8,380 a year - $4,000 of depreciation, $1,500 of insurance, $1,400 of fuel at 30 MPG and $3.50 a gallon, $1,080 of maintenance and tires, and $400 of registration and taxes. That is $698 a month, or 70 cents a mile, and it matches the shape of the ownership-cost studies run by the auto clubs.
What is the true cost per mile of driving?
Between 70 cents and $1.60 a mile for the first years of ownership, depending on the car: the table's three reference points run 70 cents (economy), $1.04 (mid-range $40,000) and $1.60 (luxury $70,000). The per-mile framing is the useful one - it prices every optional trip honestly, and it is the number to compare against rideshare, transit or walking.
Why is depreciation the biggest cost?
Because a new car loses roughly 20% of its price in the first year - $8,000 on a $40,000 car - which is more than the insurance, the fuel and the maintenance combined. The curve flattens sharply after year three, which is why the used-car version of this calculator (10% depreciation) tells a much friendlier story, and why the cheapest car to own is usually a three-year-old one.
How do I lower my true cost per mile?
Four levers, in order of power: buy fewer car (the depreciation line scales with price), keep it longer (the depreciation line collapses after year three), drive fewer miles (the per-mile rate stays but the total shrinks), and shop the insurance annually. Fuel and maintenance are the lines people obsess over; they are half of one of depreciation's lines.