Dimensional (DIM) Weight Formula Explained

What is Dimensional Weight?

Dimensional (DIM) weight reflects package density—the amount of space a package occupies relative to its actual weight. Freight carriers charge whichever is greater: the actual weight on the scale or the calculated DIM weight.

The Industry Standard DIM Formula

To calculate dimensional weight in inches and pounds:

DIM Weight (lbs) = (Length × Width × Height) ÷ DIM Factor

Common DIM Factors

The standard DIM factor for major domestic carriers (UPS, FedEx, DHL) and international air freight is 139 for Imperial measurements and 5000 for Metric measurements (cm/kg).

If a box measures 12" × 12" × 12" (1,728 cubic inches):

1,728 ÷ 139 = 12.43 lbs → Rounded up to 13 lbs billable DIM weight.

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