The volumetric weight of a package refers to the product of the package’s length, breadth, and height divided by a courier-specific constant. It is the same as the dimensional weight. For most courier companies the content used is 5000.
Volumetric weight is the same as dimensional weight for a particular package. All courier companies charge you based on the higher weight out of the true weight of the package and the dimensional weight. While the true weight of the package refers to the weight that gets displayed when you keep your package on a weighing scale, the volumetric weight takes factors such as the dimensions of the package into account.
To calculate the volumetric weight of your package, take a product of the length, breadth and height of the package and divide it by a constant, as prescribed by your courier company.
For most courier companies this constant is 5000. Remember that volumetric weight takes the dimensions of the package and not the product into account. For this reason, you must select your packaging quite wisely.