Calculating your true cost per mile

Your true cost per mile is everything the truck costs you in a year, divided by every mile it runs. Fuel is only the most visible piece. The payment, insurance, maintenance, permits, and your own pay all belong in the number, because they all come due whether or not any single load covers them.

For scale: ATRI's 2026 operational costs report put the average fleet's cost at a record $2.336 per mile for 2025, with $1.854 of that being non-fuel cost. Your number as an owner-operator will be different, and that is the point — decisions should run on your costs, not an industry average.

The cleanest way to build the number is two buckets: fixed costs and variable costs.

Fixed costs: what you pay even when parked

Fixed costs arrive on a schedule no matter what the truck does. Truck payment, liability and physical damage insurance, plates and permits, ELD subscription, monthly parking. If the truck sat in the yard all month, these bills would still clear.

Add them up for a year and divide by annual miles. Say the payment is $2,400 a month, insurance $1,100, and permits, ELD, and parking another $300. That is $3,800 a month, or $45,600 a year. At 100,000 miles a year, fixed cost comes to about $0.46 per mile.

Variable costs: what each mile adds

Variable costs only exist when the wheels turn. Fuel is the big one: price per gallon divided by your MPG. EIA's weekly survey put on-highway diesel near $4.80 a gallon in mid-July 2026; at 6.5 MPG that is about $0.74 for every mile, loaded or deadhead.

Maintenance and tires are variable too, even in months when nothing breaks. Set a per-mile reserve based on what you actually spent over the last 12 months, and treat it as spent the moment the mile is driven. Reserves also need updating: ATRI's 2026 report shows repair and maintenance costs rose 8.6 percent in 2025 alone.

Tolls, scale tickets, and trailer washouts round out the bucket. Small per event, real per year.

Pay yourself like a cost

If your own pay only exists when something is left over, every load looks profitable and you work for free on the bad ones. Put a per-mile wage into the cost stack like any other line. Whatever figure you pick, the discipline matters more than the amount: profit should mean money left after you got paid.

Why slow months raise your cost per mile

Fixed cost per mile depends on how much you run. The same $45,600 spread over 80,000 miles is $0.57 a mile; over 120,000 miles it drops to $0.38. A slow quarter quietly raises your real cost per mile, which means a rate that broke even in March can lose money in June.

That is why the number needs a refresh every quarter, and any time fuel moves hard, insurance renews, or your mileage pace changes.

Put the number to work

Once you trust the figure, it powers everything downstream. Your minimum acceptable rate is total miles times this number plus target profit, and every per-load profit estimate is only as honest as the cost per mile underneath it.

LoadMerit's cost-per-mile tool walks the same two buckets: enter your fixed bills, monthly miles, MPG, and reserves, and it returns your all-in figure. For a line-item breakdown of where owner-operator money actually goes, see owner-operator cost per mile.