How to calculate your trucking cost per mile
Your cost per mile (CPM) is the single most important number in an owner-operator business. It's what separates a load that builds your business from one that quietly drains it. The formula is simple — total costs ÷ total miles — but the accuracy lives in the details.
There are three buckets to add up:
- Fixed costs — what you pay whether the wheels turn or not: truck and trailer payments, insurance, permits, IFTA, plates, ELD and software subscriptions, parking. Spread these across the miles you actually run each month.
- Variable costs — costs that rise with miles: fuel (the big one), maintenance and repairs, tires, and DEF. Fuel per mile is just diesel price ÷ your real MPG.
- Your pay — the wage you owe yourself. Leaving this out is the most common mistake owner-operators make, and it's why a "profitable" truck can still leave you broke.
Add those three per-mile numbers together and you have your true all-in CPM — your break-even rate. Most owner-operators land somewhere between $1.80 and $2.20 per mile all-in, but yours depends on your payment, your fuel economy, and how many miles you run. Recalculate it every quarter, and any time fuel spikes, insurance renews, or you take on a new payment.
What's a good rate per mile in 2026?
As a quick gut-check, national average spot rates in mid-2026 sit near $2.79/mi for dry van, $3.12/mi for reefer, and $3.60/mi for flatbed — but those are national averages including fuel surcharge. The number that matters is the rate per total mile (including your deadhead) measured against your cost per mile. A $3.00/mi load with 200 miles of deadhead can pay less than a $2.40/mi load right under your wheels. That's exactly what the load checker above does for you.