Cost Per Mile to Drive Calculator

What goes into cost per mile

Cost per mile is the answer to a simple question: if you add up everything the car costs you in a year and divide by the miles you drive, what does each mile cost? It is the only figure that lets you compare a cheap old car with a payment on a new one, or a gas car with an EV, on the same basis.

Six things belong in the total, and people usually forget the last two:

• Fuel, annual miles ÷ your real-world MPG × the price per gallon. Your real MPG is usually 10 to 20% below the window sticker.
• Insurance, your annual premium, including any multi-car or loyalty discounts.
• Maintenance and repairs, oil changes, brakes, belts, the battery, and a sinking fund for the repair you have not had yet.
• Tires, a set every 40,000 to 60,000 miles, so roughly $800 spread across four years.
• Registration and fees, plates, inspections, and any state excise or property tax on the vehicle.
• Depreciation, the amount the car’s value falls each year. It never appears on a bill, which is exactly why it gets ignored.

The US Department of Energy fuel economy database gives you a realistic MPG figure for your exact model and year rather than the sticker number, and the IRS standard mileage rates page shows the flat per-mile figure the tax code uses. Neither is your number, only your own costs are, but both are useful sanity checks.

Worked example: 12,000 miles a year at $3.50 gas

A paid-off mid-size sedan driven 12,000 miles a year, getting 30 MPG on gas at $3.50 a gallon.

• Fuel: 12,000 ÷ 30 × $3.50 = $1,400.00
• Insurance: $1,800.00
• Maintenance and repairs: $600.00
• Tires: $200.00 (a $800 set spread over four years)
• Registration and fees: $150.00
• Depreciation: $3,000.00

Total: $7,150.00 a year. Divide by 12,000 miles and the cost per mile is $0.596, call it 60 cents. Per day, across 365 days, that is $19.59.

Look at the shape of the number rather than the total. Fuel is only $1,400 of the $7,150, about 20%. Insurance, registration and depreciation together are $4,950, which is 69% of everything you spend on the car and completely independent of how far you drive. That single fact explains almost every surprise people have about car costs: the expensive part of owning a car is owning it, not driving it.

It also means the car gets cheaper per mile the more you use it. The same $4,950 in fixed costs spread over 12,000 miles is 41 cents a mile; spread over 20,000 miles it is 25 cents.

Worked example: how a longer commute changes the number

Now take the same car and put a longer commute on it: 18,000 miles a year, a slightly thirstier 28 MPG, same gas price. Maintenance and tires rise with mileage, because they are wear items.

• Fuel: 18,000 ÷ 28 × $3.50 = $2,250.00
• Insurance: $1,800.00 (unchanged)
• Maintenance: $900.00 (scaled from $600 at 12,000 miles)
• Tires: $300.00 (scaled from $200)
• Registration: $150.00
• Depreciation: $3,000.00

Total: $8,400.00, up $1,250, or 17% more money. But the cost per mile falls from $0.596 to $0.467, a drop of 22%.

This is the counter-intuitive result that makes the calculator worth running. Driving 50% more miles cost only 17% more money, because the fixed $4,950 did not move. Anyone comparing two homes by commute distance should run this arithmetic before deciding: moving 20 miles closer to work to save $5,000 a year in driving costs is a much smaller saving than it looks once you account for that most of the cost was going to be spent anyway.

Fixed vs variable: why the extra mile is cheap

Split the six costs into two buckets and the behaviour of the number becomes obvious.

The variable costs, fuel, maintenance and tires, come to 18.3 cents per mile. That is the true marginal cost of one extra mile, and it is the number to use for a single trip. A 30-mile round-trip commute costs about $5.50 in marginal cost, not the $17.88 the all-in figure suggests.

The all-in figure of 59.6 cents is the right number for a different question: what does this car cost me overall, and should I own one at all? Use marginal cost to decide whether to take this particular drive; use all-in cost to decide whether to keep the car.

Depreciation sits in between. It is fixed in the sense that a year passes whether you drive or not, but high mileage does accelerate it. A car with 100,000 miles is worth materially less than one with 60,000, so some of the depreciation is mileage-driven. Treating it as fixed is a reasonable simplification, not a law of nature.

Cost per mile at a glance

The same car, 30 MPG, $3.50 gas, $4,950 of fixed costs, 18.3 cents of variable cost per mile, driven different distances in a year.

Reading across the table is the whole lesson: total spending climbs steadily while cost per mile falls sharply. The low-mileage driver pays the most per mile because the fixed costs are spread over fewer miles, and a car that sits in the driveway still depreciates, still needs insurance and still needs registration.

This is also why car-sharing and rideshare look expensive per trip but can still win. If you drive 4,000 miles a year, your own car costs more than $1.20 a mile, and at that level a handful of $25 Uber rides a month is genuinely cheaper than owning. The crossover point is usually somewhere around 7,000 to 9,000 miles a year for a car with meaningful fixed costs.

How this compares to the IRS mileage rate

The IRS publishes a flat rate per mile that businesses, and some self-employed drivers, can deduct instead of tracking every actual expense. For 2025 it is 70 cents per mile for business driving, up from 67 cents in 2024. That is not the same as your cost per mile, and confusing the two causes real mistakes.

• The IRS rate covers fuel, maintenance, tires and depreciation.
• It does not cover insurance, registration or finance charges, which you cannot add on top.
• It is a tax allowance, averaged across the whole country, not a measurement of your car.

So if your all-in cost is 59.6 cents and the IRS allows 70, the rate is generous for a low-mileage driver and tight for someone running an expensive new vehicle. If your all-in cost is $0.80, a lightly used new car, the standard rate understates what you spend, even though it is the higher number per mile.

For a self-employed driver, the standard rate is usually the simpler choice and often the better one, because it needs no receipts and no depreciation schedule. For a business with a fleet, actual-expense accounting frequently wins. The IRS standard mileage rates page has the current figures, and the CFPB auto loan tools are the place to check what financing is costing you if a payment is part of the picture.

This page is general information about how car costs work, not tax or financial advice. Deductibility, depreciation schedules and record-keeping rules depend on your situation, and a tax professional can tell you which method applies to you.