Volume weight (sometimes referred to as dimensional weight) is calculated using a volumetric weight formula.
Different courier companies use different metrics, but to establish the volumetric weight of your package, you just need to measure the length, height and width of your parcel.

Then grab your calculator and:

Multiply the parcelâ€™s three dimensions (length x height x width)

If you are using centimetres then divide the result by 5000 (or 4000 for EU economy services).
If you are using inches then divide the result by 305 (or 245 for EU economy services).

The resulting figure represents the volumetric weight of your parcel

The courier will compare the volumetric weight to the actual physical weight of a parcel and charge whichever is the greater of the two (also known as billable weight or chargeable weight)

Volumetric weight

length x height x width / 5,000 if cm (or 305 if using inches)