How to Figure Your Cost Per Mile as an Owner-Operator
Fixed costs: what you pay whether the truck moves or not
Start with the bills that arrive every month no matter how many miles you run. The truck and trailer payment. Insurance: primary liability, physical damage, cargo, and bobtail or non-trucking liability if you lease on. Plates and IRP registration, permits, the UCR fee and the heavy vehicle use tax on Form 2290, all spread to a monthly figure. ELD subscription, phone and data, load-board subscriptions, accounting or software, truck parking, and your own health insurance if the business pays it. Add them up and write down one number: fixed cost per month. For many owner-operators with a truck payment it lands somewhere between $5,000 and $9,000, but your number is the only one that matters.
Fixed costs are why sitting still is expensive. A week in the shop or a week waiting on a load does not lower them by a dollar, which is why cost per mile climbs fast when miles drop.
Variable costs: what every mile costs you
Variable costs scale with miles. Fuel is the biggest line by far, and the math is simple: price per gallon ÷ miles per gallon = fuel cost per mile. At $3.50 a gallon and 7.0 mpg that is 50¢ a mile; at 6.0 mpg it is 58¢, which is why a half mile per gallon is worth chasing. Then add a maintenance and repair reserve (10¢ a mile is a common starting point for a used truck, and you bank it whether or not anything breaks this month), tires (4¢ to 5¢ a mile), DEF, tolls, scales and washes. Call it 65¢ a mile for the example below. The trucking cost per mile calculator takes each of these as its own input.
Cost per mile, and why deadhead counts
The formula is total cost ÷ total miles = cost per mile, and total miles means every mile the truck moves, loaded or empty. You burn fuel and wear tires on deadhead miles just the same, and the fixed costs do not care which miles were paid. But you only get paid on loaded miles, so the rate you need to see on a load is higher than your cost per mile:
Break-even rate per loaded mile = cost per mile ÷ loaded ratio. If 85% of your miles are loaded, divide by 0.85. At 75% loaded, divide by 0.75, and the same truck needs a noticeably better rate. Cutting deadhead is the cheapest raise you can give yourself.
Worked example: $1.35 a mile, $1.59 loaded
Say fixed costs are $7,000 a month and variable costs are 65¢ a mile, and you run 10,000 miles a month with 85% of them loaded.
| Item | Amount |
|---|---|
| Fixed costs | $7,000 |
| Variable costs (10,000 × $0.65) | $6,500 |
| Total monthly cost | $13,500 |
| Cost per mile ($13,500 ÷ 10,000) | $1.35 |
| Loaded miles (85%) | 8,500 |
| Break-even per loaded mile ($13,500 ÷ 8,500) | $1.59 |
A load at $1.59 a mile keeps the lights on and pays you nothing. Your pay is a cost of running the business, so put it in the formula. If you want $6,000 a month for yourself, total cost becomes $19,500, and $19,500 ÷ 8,500 is $2.29 per loaded mile before the business keeps a dollar of profit for the next truck, a blown turbo or a slow February. Set your floor rate from that number, not from what other trucks on the board are taking. If you are comparing this with a company job, the cents-per-mile pay calculator turns a CPM offer into weekly and annual pay.
Track it monthly, and keep IFTA and taxes in the picture
Cost per mile is not a number you figure once. Fuel prices move, miles swing with the season and a big repair lands in one month, so total it every month and watch the trend over a rolling three months. Keep your fuel receipts, because you need them for IFTA anyway: fuel tax is owed to each state based on the miles you ran there, not where you bought the fuel, and the quarterly return is due by the last day of the month after each quarter (April 30, July 31, October 31 and January 31). State miles are a record you keep every day, not one you rebuild later.
None of the costs above include income tax or self-employment tax. As a sole proprietor you owe 15.3% self-employment tax on 92.35% of net profit plus income tax, paid through quarterly estimates due April 15, June 15, September 15 and January 15. Setting aside a fixed share of every settlement keeps those dates from becoming a crisis; 25% to 30% is a common starting point, and the self-employment tax calculator gives a closer estimate for your profit and state. These are estimates, and the right entity structure and deductions are a conversation to have with a tax professional. Haulforge keeps the books, the state miles for IFTA and the per-mile numbers in one offline app, so the figures in this article stay current for your truck.
Step by step
- Total your fixed costs per monthTruck and trailer payment, insurance, plates and permits, 2290, ELD, phone, parking, software and health insurance, each converted to a monthly figure.
- Figure variable cost per mileFuel (price per gallon ÷ mpg) plus a maintenance reserve, tires, DEF, tolls and scales.
- Add them and divide by total milesFixed plus variable for the month, divided by every mile including deadhead, is your cost per mile.
- Divide by your loaded ratioCost per mile ÷ loaded share (0.85 if 85% of miles are loaded) is the break-even rate per loaded mile.
- Add your pay and a marginPut your own monthly pay into the costs, rerun the division, and set a floor rate above the result.
- Recalculate every monthFuel, miles and repairs move; track the trend and set money aside for IFTA and quarterly taxes.
Frequently asked questions
Should my own pay be included in cost per mile?
Not in the bare cost figure, but add it before you set a rate. A rate that only covers truck costs pays you nothing for driving it.
Why is my break-even rate higher than my cost per mile?
Because you drive every mile but only get paid for loaded ones. Divide cost per mile by your loaded ratio; at 85% loaded, $1.35 becomes $1.59.
How much should I set aside for taxes?
Many owner-operators hold back 25% to 30% of each settlement as a starting point and adjust after the first quarterly estimate. The self-employment tax calculator gives a closer number for your profit and state, and a tax professional can refine it.
Is IFTA a cost per mile item?
Fuel tax is already in the pump price, but IFTA settles it by the state where the miles were run, so each quarter you may owe or get a refund. Track state miles daily and treat any net IFTA payment as a variable cost.
Written by TapForge Studios, a one-person Android studio run by a tradesman with a background in electrical, HVAC and life-safety work. Reviewed October 7, 2026. This guide is general information, not engineering, legal or tax advice; the adopted code edition, the manufacturer's instructions and the authority having jurisdiction govern.
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