The number one reason new trucking authorities fail in their first year is an inaccurate understanding of their true Cost Per Mile (CPM). Booking freight based on raw gross revenue rather than net operating profit leads carriers to haul loads that actually lose money after factoring in fuel, tires, insurance, and equipment depreciation. This guide provides the exact financial formula to calculate fixed and variable CPM.
1. Fixed Costs vs. Variable Costs
Your expenses split into two distinct categories:
- Fixed Costs (Monthly Overhead incurred whether the truck moves or sits): Truck loan/lease payments ($1,800–$2,800/mo), physical damage & primary liability insurance ($1,200–$2,200/mo), ELD subscriptions ($50/mo), accounting & legal ($100/mo), and license/permit fees.
- Variable Costs (Expenses incurred strictly per mile driven): Diesel fuel, DEF fluid, oil changes, tire wear ($0.04/mile), maintenance reserves ($0.15/mile), tolls, and driver compensation.
2. The CPM Calculation Formula
Total CPM = (Total Monthly Fixed Costs ÷ Monthly Total Miles) + (Total Variable Costs Per Mile)
Example: If fixed overhead is $5,000/mo and you drive 10,000 miles per month, fixed CPM is $0.50/mile. If variable expenses total $1.25/mile, your break-even CPM is $1.75 per mile. Any load paying less than $1.75 across loaded AND deadhead miles represents a net financial loss.