The single most dangerous number in trucking is gross revenue. We see carriers boast about booking a $3,500 load on a 1,000-mile run ($3.50/mile), only to end up broke at the end of the month because they had 400 deadhead miles getting there, sat for 18 hours unpaid, and bought fuel in a high-tax state.
Gross revenue is vanity. Net profit per mile is reality. If you do not know your exact Cost Per Mile down to the penny, you cannot negotiate intelligently with brokers, and you cannot tell the difference between a load that builds your business and a load that slowly runs you out of cash.
The Simple Cost Per Mile Formula
Your Cost Per Mile is made of two distinct categories:
- Total CPM = (Monthly Fixed Costs ÷ Monthly Total Miles) + Variable Cost Per Mile
- Total Miles includes ALL miles: loaded miles + empty deadhead miles.
Step 1: Calculate Your Monthly Fixed Costs
Fixed costs are expenses you must pay every 30 days regardless of whether your truck rolls 10,000 miles or sits parked in a yard with a blown turbo.
| Fixed Expense | Realistic 2026 Monthly Cost | Notes |
|---|---|---|
| Tractor Payment / Lease | $1,600 to $2,400 | $0 if owned outright (add $300/mo to depreciation reserve instead) |
| Trailer Payment / Rental | $600 to $950 | Dry van or flatbed note |
| Commercial Insurance | $1,350 to $1,900 | Primary liability + cargo + physical damage |
| ELD & Software Subscriptions | $50 to $120 | Motive, Samsara, or KeepTruckin |
| Load Board Subscriptions | $85 to $170 | DAT One + Truckstop |
| Cell Phone & Hotspot | $90 to $140 | Business portion |
| Accounting & TMS Tools | $75 to $150 | Bookkeeping, invoicing software |
| Base Plates & Permits (Amortized) | $150 to $200 | IRP plates ($1,800/yr ÷ 12) + 2290 Heavy Highway Tax ($550/yr) |
| TOTAL MONTHLY FIXED COSTS | $4,000 to $6,030 | Average benchmark: ~$4,800/month |
If you drive 8,000 miles per month and your fixed costs are $4,800:
Fixed Cost Per Mile = $4,800 ÷ 8,000 miles = $0.60 per mile.
Notice what happens if you run 10,000 miles instead: $4,800 ÷ 10,000 = $0.48/mile. Running more productive miles dilutes your fixed overhead.
Step 2: Calculate Your Variable Cost Per Mile
Variable costs are expenses that only occur when your wheels are turning. Every mile driven burns fuel, wears tires, and moves you closer to the next service interval.
| Variable Expense | Cost Per Mile (Benchmark) | How It's Calculated |
|---|---|---|
| Diesel Fuel | $0.58 to $0.68 per mile | At $3.85/gal diesel and a conservative 6.2 MPG average ($3.85 ÷ 6.2 = $0.62/mi) |
| DEF (Diesel Exhaust Fluid) | $0.02 to $0.03 per mile | 1 gallon DEF per 50 to 70 gallons diesel |
| Maintenance & Repairs Reserve | $0.15 to $0.22 per mile | Oil changes every 15k, brakes, air bags, sensors, unexpected breakdowns |
| Tire Replacement Fund | $0.04 to $0.06 per mile | Steers replaced every 100k, drives replaced every 250k (set aside $0.05/mi) |
| Dispatch Fee (Falcon 5%) | $0.12 to $0.16 per mile | 5% fee on a typical $2.60 to $3.00/mile gross rate |
| Tolls & Scales | $0.04 to $0.08 per mile | Average across Northeast/Midwest toll roads |
| TOTAL VARIABLE COST PER MILE | $0.95 to $1.23 per mile | Average benchmark: ~$1.10/mile |
Step 3: Putting It Together, Your True Breakeven
Now, add your Fixed CPM and Variable CPM:
- Fixed Cost: $0.60 per mile (at 8,000 miles/month)
- Variable Cost: $1.10 per mile
- True Breakeven Cost Per Mile: $1.70 per mile
What this means: If a broker offers you a load paying $1.70 per loaded mile, you are working for free. You are exchanging the physical life of your truck and tires for cash that immediately leaves your account to pay expenses, leaving zero dollars for your family, your health insurance, your tax bill, or your retirement.
How Much Should You Actually Charge?
An owner operator is both the business owner and the CDL driver. You need to pay yourself a driver wage ($0.65 to $0.75/mile minimum) plus an owner profit margin (10% to 15%):
- Operating Cost: $1.70
- Driver Pay: $0.70
- Business Net Profit Margin: $0.35
- Minimum Target Rate: $2.75 per mile on all odometer miles (including deadhead)
Driver Discussion & Q&A 4
Join the Discussion and Ask the Dispatch Desk
Have experience with this or running into issues on the road? Leave a comment or question below.
Most truckers at truck stops only calculate diesel and think that's their CPM. When you calculate insurance and truck payments sitting in your driveway, you realize $1.90 freight is working for free.
Preach Travis. At 10,000 miles a month, fixed costs alone average $0.50 to $0.60 per mile before your engine even turns over.
What is a realistic maintenance reserve to set aside per mile right now in 2026?
With dealership labor rates at $180 to $220/hr, we instruct all our carriers to set aside 18 to 22 cents per odometer mile into a dedicated high-yield business savings account.