Dimensional Weight (DIM Weight)

Dimensional weight, or DIM weight, is a pricing technique used by carriers to charge for the space a package occupies rather than just its actual weight. It is calculated by multiplying the package's length × width × height (in inches) and dividing by a DIM factor (typically 139 for domestic ground). Carriers bill the higher of actual weight versus DIM weight, meaning a large but light box is often billed at its DIM weight.