Ask an owner-operator what their cost per mile is and most will give you a number. Ask how they got it and the answer is usually some version of "fuel plus the note, roughly". That rough figure is normally well short of the real one, and when margins are already thin, the gap is the difference between building something and slowly running it down without noticing.
What belongs in the calculation
Split everything into costs that accrue whether the truck moves or not, and costs that scale with distance. Both matter; only one of them is obvious.
Fixed costs
- Truck payment or lease
- Insurance — liability, cargo, physical damage, bobtail
- Permits and licensing — apportioned plates, IFTA, UCR, the annual heavy vehicle use tax
- ELD, software and phone
- Accounting and legal
- Your own pay
Variable costs
- Fuel — usually the largest single line
- Maintenance and repairs
- Tyres, amortised across their life rather than booked in the month you buy them
- Tolls
- DEF
- Scales, parking and unreimbursed lumpers
A worked example
One truck, 10,000 miles in a month. These figures are illustrative — yours will differ, which is exactly why the exercise is worth doing.
| Line | Monthly | Per mile |
|---|---|---|
| Truck payment | $2,200 | $0.220 |
| Insurance | $1,400 | $0.140 |
| Fuel — 7.0 mpg at $3.80 | $5,430 | $0.543 |
| Maintenance | $1,000 | $0.100 |
| Tyres, amortised | $300 | $0.030 |
| Permits & licensing | $200 | $0.020 |
| ELD & software | $100 | $0.010 |
| Tolls | $400 | $0.040 |
| Phone & miscellaneous | $200 | $0.020 |
| Accounting | $150 | $0.015 |
| Total | $11,380 | $1.138 |
That is $1.14 a mile before you pay yourself anything. If you are booking at $2.50 a mile and feeling comfortable, the real margin is about $1.36 — and that still has to cover your wages, your health insurance and your quarterly tax.
After those, take-home is often somewhere between fifty and seventy cents a mile. Still a business worth running, but a very different number from the one that felt good when you booked the load.
The three mistakes
Forgetting the irregular expenses
Tyres, major services, annual filings. They do not arrive every month but they arrive. Amortise them or your good months will feel better than they are and your bad months will feel like catastrophes.
Tracking inconsistently
A fuel receipt here, a repair invoice there, tolls on a card nobody reconciles. When expenses live in three places and a glove box, the real number is not hidden — it simply does not exist yet.
Confusing revenue with profit
Gross revenue per mile is not the number that matters. A $3.00 load with 600 miles of deadhead is worse than a $2.40 load with none. You cannot see that without counting every mile the truck turned.
Start with one month
- 01Pull every expense from the last thirty days — bank statements, fuel cards, receipts, everything.
- 02Sort each one into the categories above.
- 03Add up the miles you actually drove, loaded and empty.
- 04Divide.
That single figure will tell you more about your business than a year of watching the rate on load boards.