DIM Weight Calculator

Dimensional weight (also called volumetric weight or DIM weight) is a pricing method used by shipping carriers that accounts for package volume rather than just actual weight. Carriers charge based on whichever is greater: the actual weight or the dimensional weight.

The dimensional weight formula is simple: multiply Length x Width x Height (in inches) and divide by the carrier's dimensional factor. UPS and FedEx use a dim factor of 139 for domestic shipments, while USPS uses 166. International shipments often use a factor of 139 across all carriers.

Dimensional weight pricing was introduced because large, lightweight packages take up valuable cargo space. A box of pillows, for example, might weigh only 5 lbs but occupy the same trailer space as a 50-lb box of books. Without dim weight pricing, carriers would lose money transporting bulky, lightweight goods.

To reduce dim weight charges, use the smallest box that safely fits your product. Eliminate excess void fill, consider poly mailers for soft goods, and explore custom box sizes instead of standard ones. Even reducing each dimension by one inch can meaningfully lower your billable weight and shipping costs over thousands of shipments.