The Weight Volume of a shipment is calculated using the maximum dimensions of length, height and width of the pieces. Shipments exceeding the following, are charged by Volume:
6000 cubic centimeters per kilogram.
366 cubic inches per kilogram.
166 cubic inches per pound.
The Weight Charged is the highest from the actual Gross Weight and the Weight per Volume.
Reference: If there is a decimal number, the Dimensional Weight will be rounded to the next whole number.