Dimensional Weight Calculator
Work out the billable (volumetric) weight of a parcel for couriers and air freight.
About the Dimensional Weight Calculator
Light but bulky parcels are charged by size. Dimensional weight = length × width × height ÷ a divisor set by the carrier: commonly 5,000 cm³/kg for express couriers, 6,000 for air freight (IATA), and 139 in³/lb for UPS and FedEx daily rates in the US (166 for some retail and USPS services). You pay for whichever is greater, dimensional or actual weight.
The formula
DIM weight = L × W × H ÷ divisor; billable = max(DIM, actual)
Worked example
Example: Billable weight = 38 lb
- Inputs: Units: in / lb; Length: 22; Width: 18; Height: 13; Actual weight: 20; Divisor (0 = typical): 0.
- Formula: DIM weight = L × W × H ÷ divisor; billable = max(DIM, actual)
- Result: Billable weight = 38 lb
Questions people ask
How do I lower it?
Use the smallest box that protects the item.
Do I round dimensions?
Most carriers round each dimension up to the next whole cm or inch first.