Actual weight refers to the real weight of a shipment as measured on a scale. It's the gross weight of the goods including packaging, and is typically measured in kilogram. Volumetric weight, also known as dimensional weight, is a calculated weight that considers the dimensions of a package. It's used to account for the space a package occupies in a vehicle or container. Billable weight is the weight used to calculate the shipping charge. The larger of the two weights is typically used as the billable weight and that is what you will be charged