Dimensional weight, also called "dim" weight, is used because the space a package takes on an aircraft may cost more than the package's actual weight. You should calculate dimensional weight on every shipment, compare that to its actual weight; the greater of the two will determine your shipping cost. International and domestic dimensional weights are calculated differently using the formulas below.

For Domestic Shipments:

L x W x H (cubic inches) / 194 = Dimensional Weight.
Example: 30" x 24" x 22" = 15,840 / 194 = 82 lbs. (round up to the nearest pound)
The Dimweight is given in pounds.
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For International Shipments:

L x W x H (cubic inches) / 166 = Dimensional Weight.
Example: 30" x 24" x 22" = 15,840 / 166 = 95 lbs. (round down to the nearest pound)