Calculate the item's volumetric equivalent of its actual weight by dividing its cube (or cubic volume), as measured in step 2, by a density factor.

The formula we use to calculate the volumetric equivalent of the item's actual weight is:

Cubic volume / density factor = volumetric equivalent actual weight.

The density factor is a number that shows the fact that items weighing a certain amount are generally of a certain size or volume.

We apply a density factor of 5,000 (when measuring in cubic cm) or 139 (when measuring in cubic inches) to:

- Priority™
- Xpresspost™
- Expedited services™
- All U.S. and International services (excluding Tracked Packet™ and Small Packet™)

We apply a density factor of 6,000 (when measuring in cubic cm) or 166 (when measuring in cubic inches) for the Regular Parcel™ service

There are some examples of calculations of volumetric equivalent of actual weight on the next page.