How Much Does It Cost to Run a Commercial Truck Per Mile?
The American Transportation Research Institute (ATRI) puts the average marginal cost of operating a truck at $2.27 per mile in 2025. Your number will be different. Fuel, driver pay, depreciation, insurance, maintenance, tolls and tires all feed into a per-mile total that determines whether a load makes money or quietly bleeds cash. This calculator breaks every cost category down to the mile so owner-operators and fleet managers can spot leaks before they sink the quarter. The full methodology and source data live at atri-online.org, ATRI's official site.
The core idea is simple: add up everything you spend in a year, divide by the miles you run, and you have your cost per mile. Compare that to what shippers pay you per mile, and the gap is your profit margin. The hard part is not the math — it is collecting every cost line honestly. Too many owner-operators forget depreciation, undercount maintenance, or ignore the fixed costs that pile up even when the truck sits. The calculator above forces every category into the open so nothing hides.
Variable costs: fuel, driver, maintenance and tires
Variable costs scale with miles driven. For a Class 8 semi averaging 6.5 mpg at $4.10 diesel, fuel alone runs about $0.63 per mile — the single largest line for most carriers. Driver pay at $0.70 per mile is close behind, and together fuel and driver make up roughly two-thirds of total operating cost. Maintenance and tires add another $0.24 per mile combined. When fuel prices spike, the only lever is fuel economy: even a 0.5 mpg improvement from aerodynamic fairings or smarter routing shaves thousands off the annual fuel bill. The truck-type selector in the calculator adjusts fuel economy automatically — a cargo van at 14 mpg costs less than half as much per fuel mile as a Class 8.
Fixed costs: insurance, depreciation, permits and overhead
Fixed costs do not change with miles, but they still have to be recovered per mile. A $145,000 truck depreciated over five years to a $25,000 salvage value costs $24,000 a year — about $0.24 per mile at 100,000 annual miles. Insurance at $12,000, tolls and permits at $4,000, and other overhead at $8,000 add another $0.24 per mile. The danger of low utilization is here: drop to 60,000 miles and your fixed cost per mile balloons from $0.48 to $0.80, turning a profitable truck into a loss-maker overnight. This is why carriers push drivers hard on hours and deadhead minimization — every unpaid mile still burns fixed cost.
The depreciation trap and Section 179
Depreciation is the most misunderstood cost because it is non-cash. You wrote the check for the truck years ago, so it feels free to drive — but the asset is losing value every mile, and the IRS lets you recover that loss as a deduction. Straight-line depreciation (purchase price minus salvage, divided by useful life) is the simplest method and what this calculator uses. For tax purposes, many owners instead elect Section 179 expensing to take a large first-year deduction — but that is a tax timing choice, not a free ride. The truck still depreciates economically whether or not you claim it on Form 4562. Budget for both: the cash you need to run today and the tax deduction you take tomorrow.
Reading your cost-per-mile chart
The bar chart above shows each cost category in cents per mile, with the largest category highlighted in red. For most Class 8 operations that red bar is driver pay or fuel, depending on diesel prices. If your red bar is depreciation, you may be over-trucked for your mileage — consider a cheaper unit or more miles. If it is maintenance, your truck may be aging past the economical rebuild point. The chart is a diagnostic, not a verdict: it tells you where to look first when you need to cut cost per mile.
Cost per mile vs operating ratio
Cost per mile is half the story; the other half is what you earn. Operating ratio — operating expenses divided by operating revenue — is the industry standard measure of efficiency. An operating ratio of 95 means you spend 95 cents to earn a dollar, keeping 5 cents as profit. Anything under 100 is profitable; anything over 100 is a loss. The best-run fleets target a 90–93 operating ratio, leaving a 7–10% margin. Owner-operators often run higher because they lack the back-office scale of a fleet. Track your operating ratio monthly — a creeping ratio is the earliest warning sign of rate compression or cost inflation.
How to cut your cost per mile
The highest-leverage moves are fuel economy and utilization. A 1 mpg improvement on a Class 8 saves roughly $10,000 a year in fuel at 100,000 miles. Adding 10,000 loaded miles per year spreads fixed costs thinner, cutting cost per mile by $0.05 or more. Beyond that: shop insurance annually (carriers vary 30%+), buy tires in volume, stay current on preventive maintenance to avoid catastrophic breakdowns, and use a fuel card with price transparency. None of these are glamorous, but trucking is a pennies business — every cent per mile matters across 100,000 miles.
The bottom line
For a typical Class 8 semi at 100,000 miles, $4.10 diesel and $0.70 driver pay, the calculator shows a total cost around $2.05 per mile — about 10% below the ATRI $2.27 average, leaving roughly $0.45 per mile in profit at a $2.50 rate. That is a healthy operation. If your number comes in above your rate, the chart tells you where to look. Run the calculator with your own numbers, then re-run it whenever diesel moves a quarter or your insurance renews. For the tax side of a truck purchase, pair this with our Section 179 calculator to see your first-year depreciation deduction.