VGM Rules Explained: Verified Gross Mass for Container Exporters

Since the SOLAS amendment took effect, no container can legally be loaded onto a vessel without a verified gross mass declared by the shipper. It is one of the simpler compliance requirements in ocean freight, and yet it still strands containers at terminals every week — usually because the deadline was missed or the number came from an estimate rather than a scale.

What VGM actually means

Verified Gross Mass is the total weight of a packed container: the cargo, all packaging, all dunnage, all securing and blocking material, plus the tare weight of the container itself. It is not the cargo weight. It is not the net weight on your commercial invoice. It is everything that will be lifted onto the ship.

The rule exists because misdeclared container weights have contributed to stack collapses, vessel stability problems and crane and chassis failures. A container declared at 18 tonnes that actually weighs 26 changes how a vessel is loaded and how it behaves at sea.

Who is responsible

The shipper named on the ocean bill of lading is legally responsible for providing the VGM. Not the freight forwarder, not the trucker, not the warehouse — though any of them may perform the weighing on the shipper’s behalf.

The declaration must be signed by a person duly authorised by the shipper. In practice that means a named individual, not just a company name, and the signature can be electronic.

The two approved methods

Method 1 — weigh the packed container

Weigh the entire sealed, loaded container on calibrated equipment. A certified truck scale is the usual route: weigh the tractor and loaded container, then subtract the known tractor weight, or use a platform scale that isolates the container.

Method 1 is simpler, harder to get wrong, and generally what terminals and carriers prefer. It is the right choice for most exporters, especially anyone shipping mixed or irregular cargo.

Method 2 — weigh and sum the components

Weigh each package, pallet, and piece of dunnage separately, add them together, and add the container’s tare weight as marked on the door. The total is the VGM.

Method 2 requires a documented, certified procedure. Many national administrations require the method to be approved or the procedure to be auditable, so it is not something you can simply decide to start doing. It suits shippers with homogeneous, individually weighed cargo — a producer shipping identical cases of a single SKU, for instance — and it lets you calculate VGM before the container is even sealed.

Critically, Method 2 cannot be used with estimates. If any component weight is estimated rather than weighed, the result is not a valid VGM.

The tare weight trap

Container tare weight is stencilled on the door and printed on the CSC plate. Use that number, not a generic figure for the container size. Tare weights vary by several hundred kilograms between containers of the same nominal size depending on age, construction and repairs.

A second trap: if the container has been repaired with steel patches or has an accumulation of old flooring and residue, actual tare can exceed the stencilled figure. Method 1 catches this automatically. Method 2 does not.

Deadlines and submission

VGM has to be submitted to the carrier and terminal before the vessel’s stowage plan is finalised. Carriers set their own cutoffs, typically 24 to 72 hours before vessel arrival, and terminal cutoffs may be earlier still. There is no single universal deadline — check the booking confirmation for the specific cutoff on your sailing.

Submission is normally made through the carrier’s portal, by EDI, or through your forwarder’s system. The declaration must include the booking number, container number, the VGM figure with its unit of measure, the weighing method used, and the responsible party’s name and signature.

What happens when VGM is missing or wrong

No VGM, no load. Terminals will refuse to place the container on the vessel. The realistic consequences:

• The container rolls to the next sailing — often a week’s delay on a weekly service
• Storage charges accrue at the terminal
• Detention charges accrue on the container and possibly the chassis
• Re-weighing fees if the terminal weighs it for you, which some will do at a premium
• Downstream commitments — a letter of credit expiry, a retail delivery window — get missed

Where a declared VGM differs materially from a terminal weighing, carriers may charge a correction fee and, for repeated discrepancies, escalate. Tolerances are set by national administrations and carriers rather than by SOLAS itself, so do not assume a generous margin exists.

Practical guidance for exporters

Weigh after loading, not before. Dunnage, shrink wrap, corner boards and airbags add up. A container braced for a long ocean voyage can carry a surprising amount of non-cargo weight.

Weigh even when you are well under the limit. The requirement is not about exceeding the payload maximum. It applies to every packed container regardless of how light it is.

Build the weighing step into loading. If your cargo is stuffed at a warehouse near the port, the container can be weighed on the way out rather than making a separate trip to a scale. Coordinating stuffing, weighing and gate-in as one movement is a normal part of transloading and container stuffing and saves a drayage leg.

Keep the certificate. Retain the weight ticket and the signed declaration with the shipment file. If a discrepancy is alleged later, the scale ticket is your evidence.

Sequence VGM with your other filings. VGM, the AES/EEI filing and the bill of lading instructions all have separate cutoffs on the same booking. Treating them as one checklist rather than three independent tasks is what prevents the last-minute scramble.

Overweight and road limits are a separate issue

VGM compliance does not mean your container is legal on the road. U.S. federal and state axle-weight limits apply to the truck movement, and a container that is fine for the vessel can still be overweight for a highway without a permit. In Florida, drayage operators plan around this constantly — a heavy import container may need to be transloaded into two domestic trailers before it can move inland legally.

Frequently asked questions

Does VGM apply to LCL shipments?

The VGM obligation attaches to the packed container, so for LCL the consolidator who stuffs the container provides the VGM, not each individual shipper. Individual LCL shippers do need to give the consolidator accurate weights for their portion, since the consolidator is building the total from those figures.

Can I use my supplier’s stated weight as the VGM?

No. A supplier’s stated cargo weight is not a verified gross mass — it excludes the container tare and usually the dunnage, and it has not been produced by an approved weighing method. Using it is a misdeclaration even if the number happens to be close.

Who pays if a container is rolled because VGM was late?

Generally the shipper, since the obligation is the shipper’s. Storage, detention and any rebooking costs typically fall on whoever failed to submit on time. If a forwarder was contracted to handle submission and did not, that becomes a commercial dispute between shipper and forwarder rather than a carrier issue.