The volumetric weight (dimensional weight) of an item is calculated by applying the cubing rule; the rule ensures that the price charged for lightweight packages (low-density shipments) adequately covers the cost of transportation for the space occupied.
The cubing rule is widely used in the transportation industry. As per the International Air Transport Association (IATA) cubing rule, all charges are based on a minimum density of 1 kilogram per 6,000 cubic centimetres or 10 pounds per cubic foot.
The shipping price is based on the greater of the volumetric weight or the actual weight. (The actual weight cannot exceed 30 kg, but it is possible that the volumetric weight could exceed 30 kg.)
To Determine Volumetric Weight
Find the volume of the item*. Length x Width x Height = Volume
Calculate the “volumetric weight” by dividing the volume by 6,000 for centimetres.
Volume ÷ 6,000 = Volumetric Weight
Sizes and Weights
•No one dimension may exceed 2m (78.7in)
•Maximum length plus girth =3m (118in)
•A surcharge applies if the length, width or height exceeds one (1) metre
•100 mm x 70 mm x 1 mm (3.9 in x 2.7 in x 0.039 in)
Minimum dimensions for mailing tubes:
•100 mm x 23 mm x 23 mm (3.9 in x 0.8 in x 0.8 in)
•30 kg (66 lbs)
* For odd-shaped, non-rectangular items, measurements are taken at the widest point.
Measurements must be rounded up to the nearest centimetre (if weight is in kilograms).