What Is a VGM Declaration, Who Must Submit It, and by When?

A container can have every document a shipment needs — a complete packing list, a clean bill of lading draft, a booking confirmed weeks in advance — and still miss its sailing over a single missing number: its verified gross mass. VGM is a comparatively young requirement in the world of shipping documentation, introduced globally after a series of incidents where inaccurate declared container weights contributed to poor stowage planning and, in some cases, vessel stability problems. Unlike many shipping documents that exist mainly to satisfy customs or a bank, the VGM exists to satisfy a physical safety concern: a vessel loaded with containers whose actual weights don't match what's declared is a vessel that's harder to stow, harder to balance, and in extreme cases, less safe to sail. That's also why the VGM cut-off is treated so strictly compared to other paperwork deadlines — it isn't a bureaucratic formality, it's tied directly to how the vessel gets loaded.

What VGM Actually Measures

VGM stands for Verified Gross Mass, and it refers to the total weight of a fully packed and sealed container — the combined weight of the cargo inside, any packing materials, dunnage, and pallets used to secure it, plus the container's own tare weight (the weight of the empty container itself, which is marked on the container's door). It's a single figure representing exactly what the crane will lift and what the vessel will need to account for in its stowage plan.

This is distinct from other weight figures that might appear on shipping paperwork — a commercial invoice's declared cargo weight, for instance, typically covers only the goods themselves, not packing materials or the container. VGM is specifically the all-in weight of the unit as it will physically be handled at the terminal, which is why it has to be determined at the point the container is actually packed and sealed, not estimated from product specifications alone.

Why VGM Is Required: The SOLAS Connection

The VGM requirement traces back to the International Convention for the Safety of Life at Sea, better known as SOLAS — the foundational international treaty governing maritime safety. SOLAS was amended to require verified container weights specifically because inaccurate or estimated weights had, in a number of documented incidents, contributed to improper stowage and vessel stability issues. Because SOLAS is an international convention with broad adoption, the VGM requirement applies across essentially all container shipping globally, not as a rule any individual carrier or terminal invented on its own.

This international basis matters practically: a shipper can't negotiate their way out of VGM requirements with a particular carrier or expect one terminal to be more lenient than another as a matter of policy, since the underlying obligation comes from a safety convention rather than a single company's internal process.

Who Is Responsible for Providing the VGM

Under SOLAS, the shipper — the party named as shipper on the bill of lading — bears legal responsibility for providing an accurate VGM. This is a meaningful point because it's easy to assume the carrier or terminal handles weight verification as part of standard cargo handling, but the obligation to determine and declare the correct figure sits with the shipper, not with the carrier weighing it as a courtesy.

In practice, most shippers don't submit the VGM directly to the carrier themselves — a freight forwarder typically handles the submission on the shipper's behalf, since the forwarder is already coordinating the booking and other documentation. But that operational convenience doesn't shift the underlying legal responsibility: if the VGM figure turns out to be materially inaccurate, the shipper — not the forwarder facilitating the submission — is the party accountable for that inaccuracy under the SOLAS framework.

Method 1 and Method 2: The Two Ways to Determine VGM

SOLAS recognizes two methods for arriving at a VGM figure. Method 1 involves weighing the entire packed and sealed container as a single unit, typically on a calibrated weighbridge or scale suited to handling a full container — this produces a directly measured total in one step. Method 2 involves weighing the cargo, packing materials, and dunnage separately (or in combination) before or during packing, then adding that figure to the container's tare weight, which is marked on the container itself.

Neither method is inherently "better" — which one makes sense depends on where and how the container is packed, and what weighing equipment is available at that point in the supply chain. A container packed and weighed at a purpose-built facility with a weighbridge might naturally use Method 1, while cargo weighed piece-by-piece as it's loaded, with the container's tare weight added afterward, fits Method 2. What matters for compliance isn't which method is used, but that the method used is one of the two SOLAS-recognized approaches and that the underlying weighing process meets the accuracy standards the relevant authority requires for that method.

The VGM Cut-Off: Why It's Earlier and Stricter Than It Looks

Every terminal and carrier sets its own VGM cut-off time for each sailing, and it's typically earlier than the general documentation or cargo cut-off, because the VGM figure has to be in the system before the vessel's stowage plan is finalized — stowage planning depends on knowing the actual weight of every container going aboard. A container arriving at the terminal without an accepted VGM on file is, from the terminal's perspective, not ready to load, regardless of whether the cargo itself has physically arrived at the yard.

This is why the VGM cut-off functions almost as a hard stop rather than a soft target. Missing it typically isn't something that can be resolved with a late correction or an exception — the practical consequence is that the container rolls to the next available sailing, which carries its own schedule delay and, depending on the trade lane and season, potential cost implications from re-booking. Because the cut-off is set independently by each terminal and carrier and can vary by port and by vessel, confirming the specific VGM cut-off for a given booking — rather than assuming it matches a previous shipment's deadline — is a basic but important step.

Common Problems With VGM Submissions

A few recurring issues account for most VGM-related delays. Submitting the VGM after the cut-off, sometimes because the shipper treated it as equivalent in urgency to other documentation with more flexible deadlines, is the most direct cause of a rolled container. Using an estimated or outdated weight figure — rather than one determined at the point of actual packing — risks a VGM that doesn't hold up if a terminal spot-checks or independently weighs the container, which can create its own compliance problems beyond just timing.

Confusion over who is submitting the VGM is another common issue: if a shipper assumes the forwarder is handling the weighing and submission while the forwarder assumes the shipper is providing a figure directly, the VGM can fall through the gap between the two until it's too late. And treating VGM as interchangeable with the cargo weight already stated on a packing list or commercial invoice — rather than the distinct, all-in figure it actually needs to be — can produce a number that technically gets submitted but doesn't reflect the container's actual gross mass.

Example

A Thai exporter books a 40-foot container of packaged consumer goods for a China–Thailand ocean shipment. The forwarder confirms the booking and, alongside the usual documentation timeline, flags the VGM cut-off separately — in this case, two days before the vessel's general cargo cut-off, since the terminal handling the booking sets its own earlier VGM deadline. The exporter's warehouse packs and seals the container, then weighs it as a complete unit on the facility's weighbridge, using Method 1 to arrive at a single verified figure that already includes the cargo, pallets, and the container's tare weight.

The forwarder submits that VGM figure to the carrier well ahead of the cut-off, receives confirmation that it's been accepted into the vessel's stowage planning, and the container proceeds to loading on schedule. Had the warehouse instead planned to weigh individual cartons and calculate the total later — closer to Method 2, but without adding the container's tare weight correctly — and submitted that figure only the day the cargo cut-off, it would have missed the earlier VGM deadline entirely, and the container would have rolled to the next sailing regardless of how ready the rest of its paperwork was.