Packaging and Logistics

Pallet Utilization and Freight Cube Calculation

Freight cost per unit equals total shipment cost divided by units shipped. Here is how to calculate it across LTL, FTL, and parcel.

Freight cost per unit = total shipment cost divided by units per shipment, and the total has to include more than the base transportation rate. For LTL, the full number is base linehaul plus fuel surcharge plus accessorials such as liftgate, appointment, inside delivery, and residential fees. A 500 pound LTL shipment at $45 per CWT costs $225 base, and with $27 fuel, $45 liftgate, and $32 residential delivery the total is $329. If the load contains 120 units, freight cost per unit is $329 divided by 120 = $2.74. That same lane may look very different if the plant can consolidate into a full truckload or reduce carton count.

The key inputs depend on mode. Parcel and air shipments use actual weight versus dimensional weight, where DIM weight = length x width x height in inches divided by the carrier divisor, usually 139 for parcel. A 24 x 18 x 16 inch carton has a DIM weight of about 49.7 pounds, so a 15 pound product gets billed near 50 pounds. LTL pricing is driven mainly by freight class, shipment density, and lane, while FTL is usually price per mile or flat lane rate. Parcel is often cheapest below 100 to 150 pounds, and LTL is usually cheaper above 200 pounds, but the middle band needs live rate checks. Actual inputs should come from carrier invoices, TMS data, and packaging drawings, not generic assumptions from last year.

Common mistakes usually come from leaving out charges that are small on one load and huge across a quarter. Teams forget fuel surcharge, pallet exchange, limited access, reweigh fees, or the fact that poor carton design pushes a parcel shipment into DIM pricing. Another frequent miss is comparing LTL and FTL on cost alone without counting the inventory effect of waiting to consolidate. Freight class errors also distort the result, because a product shipping at class 175 instead of class 100 can cost 40% to 60% more per hundredweight. If you are not auditing actual invoices against quoted class and weight, your freight cost per unit is probably understated.

Use the result to compare packaging options, shipment frequency, and carrier modes on the same basis. A packaging redesign that cuts carton dimensions by 2 inches on each side may save more than a rate negotiation if the shipment is DIM billed. Weekly pallet consolidation often cuts LTL cost per unit by 30% to 50%, but you should compare that against the inventory cost of holding extra stock before ship date. Freight cost per unit is also useful in quoting, because it shows when a small order is unattractive even though the manufacturing cost looks fine. Plants that review freight at the SKU or customer level usually find a few lanes that are quietly destroying margin.

Advanced analysis separates freight cost per unit into plant, customer, and product drivers. Dense steel parts can ship at class 50 and absorb freight well, while low-density plastic assemblies may become freight dominated even at low product cost. Pallet pattern, stackability, and damage rate all influence the real transportation cost, so packaging engineering belongs in the discussion. Good teams track cost per shipped unit, cost per shipped pound, and cost as a percent of net sales together. That combination shows whether the problem is carrier rate, packaging density, shipment cadence, or poor customer order behavior.

Published 2026-05-28.