Freight Math

How to Calculate Freight Cost per Unit, Truckload Utilization, and Route Cost

The core freight and distribution formulas worked line by line, from cost per unit to truckload cube utilization, with real inputs and where each number comes from.

Start with freight cost per unit, the number everything else feeds. The formula is total landed freight divided by units shipped: (line haul + fuel surcharge + accessorials) / units. Say a full truckload from Memphis to Dallas costs 1,850 dollars line haul, a 22 percent fuel surcharge adds 407 dollars, and a 75 dollar liftgate accessorial applies, for 2,332 dollars total. Load 1,320 cases and cost per case is 2,332 / 1,320 = 1.77 dollars. Pull units from the actual bill of lading, not the order, because short-ships and damages change the denominator. The Freight Cost per Unit calculator does this and lets you swap weight for cases.

Truckload utilization decides whether that 1.77 dollars is as low as it can go. A 53 foot dry van holds about 3,800 cubic feet usable and grosses out near 45,000 pounds of payload. You bill against whichever limit you hit first. Cube utilization is (cases x case volume) / usable van volume. With 1,320 cases at 1.9 cubic feet each you use 2,508 of 3,800 cubic feet, or 66 percent. Weight utilization is payload / 45,000. If those cases weigh 28 pounds each you carry 36,960 pounds, 82 percent. You are weight-constrained, so adding cube-light freight is free capacity. Truckload Utilization computes both ratios side by side.

Fuel surcharge is a pass-through, but you still have to compute it. The standard method is (DOE national diesel price minus a base peg) divided by a miles-per-gallon assumption, times loaded miles. With DOE diesel at 3.98 dollars, a 1.25 dollar peg, and 6.0 mpg over 452 miles: (3.98 - 1.25) / 6.0 = 0.455 dollars per mile, times 452 = 206 dollars. Many carriers instead publish a percentage-of-linehaul table tied to price bands, which is why a 22 percent factor showed up earlier. Fuel Surcharge Impact lets you test both the cents-per-mile and percentage methods against a diesel forecast.

LTL versus FTL is a break-even calculation, not a preference. LTL prices off freight class and hundredweight: rate per CWT times (weight / 100), after discount, with a minimum. Ten pallets at 500 pounds each is 5,000 pounds, class 85, at a 42 dollar per CWT tariff with a 70 percent discount gives 5,000 / 100 x 42 x 0.30 = 630 dollars. A dedicated truckload for the same lane quotes 900 dollars. LTL wins here. Break-even sits near where truckload cost divided by LTL cost per pallet crosses your pallet count. LTL vs FTL Cost Comparison finds the crossover pallet count for your two rates.

Delivery route cost per stop is a fully loaded rate applied to time and distance. Take driver wage plus benefits (say 34 dollars per hour), tractor and trailer cost per mile (0.68 dollars), and fuel per mile (0.66 dollars at 6 mpg and 3.98 dollar diesel). A route of 8 stops covering 140 miles over 6.5 hours costs 6.5 x 34 = 221 dollars labor, 140 x (0.68 + 0.66) = 188 dollars vehicle and fuel, for 409 dollars, or 51 dollars per stop. Delivery Route Cost separates fixed time cost from per-mile cost so you see which stops are unprofitable.

Distribution center handling cost per unit closes the landed picture. Sum touch labor, equipment, and DC overhead, then divide by units processed. If a shift of 12 associates at 24 dollars fully loaded works 8 hours, that is 2,304 dollars labor. Add 340 dollars equipment and 900 dollars allocated facility for 3,544 dollars. Process 14,200 eaches and handling is 0.25 dollars per unit; process 9,000 and it jumps to 0.39 dollars, which shows why throughput dominates. Distribution Center Handling Cost lets you split receiving, put-away, pick, and pack so you know which touch is expensive.

Detention cost is small per event but compounds. The formula is (dwell hours minus free time) times the hourly detention rate, plus any downstream driver-hour cost. A 2 hour free window, 4.5 hours on the dock, and a 65 dollar per hour detention rate gives (4.5 - 2.0) x 65 = 162 dollars. Miss it on 20 loads a month and that is 3,240 dollars, before the schedule damage from a driver who now runs out of hours. Truck Detention Cost turns dock dwell logs into a monthly dollar figure so the number lands in a scheduling review.

Chain the formulas rather than running them in isolation. Cost per unit depends on utilization, which depends on cube and weight; route cost per stop depends on stop density; DC handling depends on throughput. Change one input, such as raising cases per truck from 1,320 to 1,480, and cost per case falls from 1.77 to 1.58 dollars, a 10.7 percent cut, while cube utilization climbs to 74 percent. Always tie each result back to a source document: the bill of lading for units, the DOE index for fuel, the rate confirmation for line haul, and dock logs for detention. That traceability is what makes the math defensible.

Published 2026-07-01.