Dimensional Weight
Definition
Dimensional weight is a pricing method that converts a package's volume into an equivalent weight using a divisor, so carriers can charge for the space light, bulky shipments occupy. Carriers bill the greater of actual weight and dimensional weight.
In Practice
Dimensional (dim) weight is calculated as length times width times height divided by a dim divisor, commonly 139 in inches and pounds for US parcel carriers, or volume in cubic meters times 167 kilograms in air freight. If the result exceeds the scale weight, the shipment is billed at the dim weight instead.
This matters daily because packaging choices become freight costs. A one-pound item in an oversized box can bill as seven pounds, and across thousands of parcels the waste compounds. Planners audit carton assortments, use box-selection logic in packing stations, and challenge dim-based adjustments on carrier invoices.
A concrete example: a 20 x 16 x 12 inch box weighing 6 pounds has a dim weight of 3,840 divided by 139, about 28 pounds, so the parcel bills at 28 pounds. Switching to a 16 x 12 x 10 box drops billable weight to 14 pounds.
Related Calculators
Related Terms
Freight class is a standardized rating system used in US less-than-truckload shipping that groups commodities into 18 classes, from 50 to 500, based on density, stowability, handling, and liability. Higher classes cost more to ship per pound.
Air FreightAir freight is the transport of cargo by aircraft, either in dedicated freighters or in the belly holds of passenger planes. It is the fastest long-distance mode and also the most expensive, priced per kilogram of chargeable weight.
Freight RateA freight rate is the price a carrier charges to move a shipment between two points, quoted per container, per truckload, per hundredweight, or per kilogram depending on the mode. Rates vary with distance, capacity, commodity, and market conditions.
Container UtilizationContainer utilization measures how much of a container's available volume or weight capacity a shipment actually uses, usually expressed as a percentage. Higher utilization means lower freight cost per unit shipped.