Dimensional weight is a standard formula used throughout the freight industry that considers a package’s density when determining charges. Density = weight * 1728 / (L x W x H) where weight is in pounds and L, W & H are in inches. Transportation charges are based on the gross weight of the shipment or the dimensional weight of the shipment; whichever is greater. Simply put, dimensional weight is when the weight of a package is inappropriately less than the actual size of the package. For example, a box filled with inflated balloons.