Cost Per Mile
What is cost per mile? Cost per mile (CPM) is the total operating cost to run a truck divided by the miles driven — the single most important profitability metric for owner-operators and small fleets.
Full definition
Cost per mile splits into two buckets: fixed costs (truck payment, insurance, permits, ELD subscription) that accrue whether the truck moves or not, and variable costs (fuel, tolls, maintenance, tires, driver pay) that scale with miles driven. Add both, divide by miles, and you have CPM.
A realistic owner-operator CPM in 2026 runs $1.55-$1.95 all-in — roughly $0.55-$0.75 in variable costs and the rest in fixed and overhead. Fleet CPM is usually lower per truck but higher in absolute dollars once dispatch, back-office, and management overhead are layered in. Use the truckers.finance cost-per-mile calculator to model your own numbers.
CPM is the only honest way to evaluate a load offer. A $2.10 RPM load looks profitable until you subtract a $1.85 CPM and realize the load only contributes $0.25 per mile to net profit before deadhead. A $1.75 RPM load with no deadhead can outperform a $2.40 RPM load with a 400-mile deadhead.
Track CPM monthly. Fuel and maintenance lines move with market conditions and equipment age; financing costs are stable until refinance. Carriers who don't track CPM end up chasing RPM and going broke profitably.
Example
- A single-truck operator with $4,800/month fixed costs and $0.62/mile variable running 10,000 miles has a CPM of $1.10 (variable) + $0.48 (fixed/miles) = $1.58 CPM.