How do I calculate cost per mile for my trucking business?
The basic formula is simple. Divide your total operating costs by the total miles driven. If you spent $15,000 last month and drove 12,000 miles, your cost per mile was $1.25. The challenging part is making sure you capture all your costs correctly.
Fixed costs stay relatively constant regardless of how many miles you drive. These include truck payments or lease costs, insurance premiums, annual permits and licenses, and any base plates or IFTA fees. Add these up for the month or divide annual costs by 12 to get a monthly figure.
Variable costs change based on how much you drive. Fuel is the biggest one and often runs 30 to 40 percent of your total cost per mile. A good trucking bookkeeping system tracks fuel purchases separately so you can see this number clearly. Maintenance and repairs, tires, and oil changes all fall here too. So do tolls and scale fees for specific routes.
Driver pay is a cost too, whether you’re paying yourself or employees. If you pay per mile, this is easy to calculate. If you pay hourly or salary, you’ll need to allocate that cost across miles driven. Don’t forget to include payroll taxes and any benefits you provide.
Some costs fall in between fixed and variable. Tires wear based on miles but get replaced in chunks. Tractors depreciate over time and usage. For calculation purposes, most operators spread these costs monthly using averages from their historical data.
To calculate accurately, you need clean records. Track every expense category in your accounting software and record total miles monthly from your odometer readings or ELD data. Pull reports that show your total expenses by category for the period, then divide by miles.
Run this calculation monthly. Annual averages hide seasonal variations in fuel costs and maintenance patterns. Monthly tracking shows you trends and helps you catch problems early. You’ll also see how deadhead miles affect your numbers and whether certain lanes are worth running.
Knowing your true cost per mile tells you what rates to accept and which loads make money. If your cost is $1.35 and a broker offers $1.25, you’re losing money on that haul no matter how convenient it seems. Many owner-operators underestimate their costs and take loads that feel productive but actually drain cash.
If tracking all this feels like too much on top of running routes and managing dispatch, working with a bookkeeper for small business can help. The right setup makes this calculation straightforward from your existing records rather than a monthly headache.
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More Questions
How do I track deadhead miles for tax purposes?
Deadhead miles are fully deductible business miles. Track them daily using a mileage app or log, recording the date, route, purpose, and odometer readings separately from your loaded miles.
Read answerIs it better to hire a local bookkeeper or use an online service?
Most local bookkeepers work digitally now, so the real question is whether you need automated software or a dedicated professional. Local expertise matters when you want someone who understands your region and industry.
Read answerHow do I handle seasonal income fluctuations in my books?
Track your revenue and expenses consistently each month so you can identify seasonal patterns over time. Use year-over-year comparisons rather than month-to-month, and build cash reserves during peak months to cover slow periods.
Read answerHow much does a bookkeeper cost for a small business?
Small business bookkeeping typically costs $200 to $600 monthly for basic services. The actual price depends on transaction volume, industry complexity, and what services you need beyond monthly books.
Read answerWhat's the best way to organize receipts as a truck driver?
Capture receipts digitally the moment you get them using your phone or an app. Organize by expense category and back up to cloud storage so nothing gets lost in the cab.
Read answerHow do I handle retainer payments in my books?
Record retainer payments as a liability when received, not as income. The money becomes revenue only when you've performed the work. In QuickBooks, use a Customer Deposits or Unearned Revenue account to track what you owe clients.
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