Why loaded-mile break-even is the number that matters
Every cost you have — payments, insurance, fuel, tires, your own pay — has to be earned back only on the miles somebody pays for. If your all-in cost is $1.95 per mile and 12% of your miles are empty, the freight has to pay $1.95 ÷ 0.88 = $2.22 per loaded mile before you make your first dollar of profit. Book below that number often enough and the math catches up with you, no matter how busy you feel.
One definition to get right: deadhead % here means empty miles divided by total miles (empty ÷ everything), not empty divided by loaded. 12,000 empty out of 100,000 total = 12%.
What this calculator deliberately keeps simple
It runs on a cash basis: your actual truck payments count, and depreciation doesn't appear separately (counting both would double-count the truck). Detention time, washouts, lumpers, and downtime aren't line items — pad your maintenance or admin figures if you want them reflected. A fancier economic view (replacement reserve instead of payments) may come later.