Your cost per mile is your total operating costs for a period divided by the miles you drove in that period. Split costs into fixed items, such as the truck payment and insurance, and variable items, such as fuel, maintenance and driver pay. In the example below, a truck running 120,000 miles a year with $43,400 of fixed costs and diesel at $6.276 a gallon costs about $2.22 a mile to operate.
Knowing that number tells you which loads make money and which ones only keep the wheels turning.
What goes into cost per mile?
Fixed costs stay the same whether the truck moves or not:
- Truck and trailer payments or lease
- Insurance
- Registration, permits and licensing
- Parking, phone and software subscriptions
Variable costs rise with each mile:
- Fuel
- Maintenance and repairs
- Tires
- Driver pay, if paid by the mile
- Tolls
Divide fixed costs by annual miles, add variable costs per mile, and you have the total.
How do I calculate cost per mile step by step?
Worked example for one tractor-trailer:
- Annual miles: 120,000
- Truck payment: $2,200 a month, or $26,400 a year
- Insurance: $14,000 a year
- Permits, registration and other fixed costs: $3,000 a year
- Fixed total: $43,400, or $43,400 ÷ 120,000 = $0.362 a mile
Variable costs per mile:
- Fuel: $6.276 a gallon ÷ 6.5 miles per gallon = $0.966
- Maintenance: $0.20
- Tires: $0.04
- Driver pay: $0.65
- Variable total: $1.856
Total: $0.362 + $1.856 = about $2.22 a mile. If a load pays $2.75 a mile, the margin is about $0.53 before income tax. Run your own numbers in the trucking cost per mile calculator.
How much does fuel affect cost per mile?
Fuel is usually the largest variable cost. The U.S. Energy Information Administration’s weekly survey put the national average on-highway diesel price at $6.276 a gallon for the week of October 19, 2026. At 6.5 miles per gallon, that is about $0.97 a mile. Improving to 7.5 miles per gallon cuts fuel to about $0.84 a mile, saving roughly $15,500 over 120,000 miles. Speed, idling, tire pressure and aerodynamics all matter. Use the fuel cost calculator to test different prices and fuel economy.
Why do miles driven change cost per mile so much?
Fixed costs are spread over every mile. If the same truck runs 100,000 miles instead of 120,000, fixed cost rises from $0.362 to $0.434 a mile. Empty miles count too: deadhead miles add cost without revenue, so calculate your rate per loaded mile as well as per total mile. A truck that sits idle for two weeks still pays its insurance and loan, which pushes up cost per mile for the whole month. Planning backhauls and limiting time waiting at docks keeps the fixed share low.
How do per diem and depreciation fit in?
Two tax items affect your after-tax result rather than your cash cost per mile. Under IRS Notice 2026-60, the special meal and incidental expense rate for the transportation industry is $80 a day within the continental United States and $86 a day outside it, effective October 1, 2026. Eligible drivers can use these rates instead of tracking actual meal costs, subject to IRS limits on the deductible share.
Depreciation spreads the cost of the truck over several years for tax purposes, and Section 179 may allow faster expensing, so check your figures with the depreciation calculator. Owner-operators should also set aside money for quarterly payments; the quarterly estimated tax calculator helps you plan.
What about using the IRS standard mileage rate?
The IRS standard mileage rate for business use is 76 cents a mile for July 1 to December 31, 2026. IRS Publication 463 applies it to cars, including vans, pickups and panel trucks, not heavy tractor-trailers, so most trucking businesses deduct actual expenses instead. Do not use the standard rate as a stand-in for a semi’s operating cost; it is far below the real figure.
How do I use cost per mile to price loads?
Start with your total cost, add the profit you need, and set a minimum rate per loaded mile. For example, with a cost of $2.22 a mile and a target margin of $0.40, the floor is $2.62 a loaded mile. If 15% of your miles are empty, divide by 0.85 to cover deadhead: $2.62 ÷ 0.85 = about $3.08 per loaded mile. Reject loads below your floor unless they position you for a better one. Check overall profitability with the profit margin calculator.
What mistakes skew the calculation?
The most common errors are leaving out the owner’s own pay, forgetting irregular costs such as annual permits or a major repair, and using the truck’s best fuel economy instead of its average. Another is ignoring the reserve for future repairs and replacement. Build those items into the numbers, even as estimates, so you are not surprised later.
How often should I recalculate?
Recalculate monthly, and whenever fuel, insurance or financing changes. Diesel prices move every week, and a 50-cent change at 6.5 miles per gallon shifts cost by about 8 cents a mile. Keep fuel receipts, maintenance logs and mileage records in one place so the math takes minutes, not hours. A current cost per mile is the most useful number in a small trucking business, because every rate decision depends on it.
Sources
- U.S. Energy Information Administration: Gasoline and Diesel Fuel Update
- IRS Notice 2026-60: Special per diem rates
- IRS: Standard mileage rates
- IRS Publication 463: Travel, Gift, and Car Expenses
FAQ
What does “How to Calculate Trucking Cost Per Mile” explain?
Your cost per mile is your total operating costs for a period divided by the miles you drove in that period. Split costs into fixed items, such as the truck payment and insurance, and variable items, such as fuel, maint…
How should I use this guide with a calculator?
Read the definitions and assumptions first, then open the linked calculator with the same inputs. Treat results as estimates, not professional advice.
Is this financial or medical advice?
No. Calcenzo content is educational. Confirm important decisions with a qualified professional and official sources for your situation.