Verified gross mass (VGM) calculation
Under the SOLAS convention, no container may be loaded unless its verified gross mass has been declared by the shipper.
What the rule requires
The shipper named on the bill of lading is responsible for the declaration. Without a VGM sent before the carrier's cut-off, the container is not loaded.
Method 1 — weighing the packed container
The container is weighed once packed and sealed, on an approved weighbridge. The reading is the VGM.
Method 2 — sum of the masses
You add up the mass of each package, that of the packaging, dunnage and pallets, then the container tare shown on its plate. That is the calculation below.
Before cut-off
The VGM is sent to the carrier before its documentation cut-off, which falls several days before the vessel sails.
Calculation using method 2
Pallets
Verified gross mass
23 000 kg
75 % of the maximum gross mass
Margin before maximum gross mass · 7,480 kg
VGM 23,000 kg · Dry 40' · method 2