How to use this calculator
Start with your fixed monthly costs. Enter your truck payment, insurance premium, monthly permits and licensing fees, and any parking or storage expenses. These are costs you pay every month regardless of how many miles you drive.
Next, enter your variable costs. Look up the current diesel price per gallon in your area and enter your truck's average MPG. Add your estimated maintenance cost per mile and tire cost per mile. If you are unsure about maintenance, $0.15 per mile is a reasonable starting point for a well maintained truck.
Finally, enter the number of miles you drive (or plan to drive) each month. The calculator will instantly show your cost per mile broken down by fixed and variable, plus your total monthly and annual operating costs.
Fixed vs variable costs: what every trucker should know
Fixed costs are the expenses you pay whether your truck sits in the yard or runs 15,000 miles. Your truck payment, insurance, permits, and parking all fall into this category. The critical thing to understand is that your fixed cost per mile goes down as you drive more miles. A $3,000 monthly fixed cost spread over 8,000 miles is $0.375 per mile, but spread over 12,000 miles it drops to $0.25 per mile.
Variable costs move with every mile you drive. Fuel is the largest variable expense for most truckers, followed by maintenance and tires. Unlike fixed costs, your variable cost per mile stays roughly the same no matter how many miles you run. That is why maximizing miles is one of the most effective ways to lower your overall CPM.
Why your cost per mile matters
Your cost per mile is the single most important number in your trucking business. It tells you the minimum rate per mile you need to charge just to break even. Any load paying below your CPM is losing you money, even if the gross pay looks good on the load board.
Knowing your CPM also helps you evaluate loads more accurately. When you see a load paying $2.50 per mile and you know your CPM is $1.65, you can instantly calculate your profit at $0.85 per mile. Without knowing your CPM, you are guessing. And guessing is how truckers go out of business.
How to lower your cost per mile
The fastest way to lower your CPM is to increase your monthly miles. More miles spread your fixed costs over a larger number, which directly reduces your per mile cost. Focus on reducing deadhead, minimizing downtime, and planning efficient routes that keep you loaded and moving.
On the variable side, fuel economy improvements have the biggest impact. Slowing down from 68 to 63 mph can improve your MPG by 0.5 to 1.0 gallon, saving hundreds per month. Keep tires properly inflated, maintain your engine regularly, and use fuel discount programs at major truck stops. Shop your insurance annually, as rates can vary significantly between carriers for the same coverage.
Frequently asked questions
What is a good cost per mile for a trucking company?
Most owner operators fall between $1.50 and $2.00 per mile in total operating costs. This varies based on truck age, insurance rates, fuel prices, and how many miles you run each month. The important thing is knowing your specific number so you can price loads profitably.
What is the difference between fixed and variable costs per mile?
Fixed costs (truck payment, insurance, permits) stay the same every month regardless of miles. Variable costs (fuel, maintenance, tires) change based on how much you drive. Fixed costs per mile decrease as you drive more, while variable costs per mile remain relatively constant.
How do I calculate my fuel cost per mile?
Divide the diesel price per gallon by your average MPG. For example, $4.20 per gallon divided by 6.5 MPG equals $0.646 per mile in fuel cost. Use your actual MPG from recent trips rather than the manufacturer's estimate for accuracy.
How can I lower my cost per mile?
Drive more miles to spread fixed costs, improve fuel economy through speed management and proper tire inflation, shop insurance rates annually, and stay on top of preventive maintenance to avoid expensive breakdowns. Small improvements across all categories add up to meaningful savings.