Before a container is loaded onto a vessel, one specific piece of information must be transmitted to the ocean carrier: its verified gross mass, commonly known as VGM. This requirement, established under the SOLAS convention, applies to every ocean container, whether it travels as a full container load (FCL) or as part of a consolidation shipment.
For anyone shipping goods, a vehicle, or bales of used clothing to Africa, understanding VGM helps avoid unnecessary delays at booking time. It is an administrative step, but an unavoidable one: a container without a declared VGM simply cannot be loaded onto the vessel.
This article explains the VGM principle, who is responsible for it, the recognized methods for obtaining it, and what happens when this information is missing or inconsistent. No specific regulatory figures are included here: for the exact requirements applicable to your shipment, contact VELOX Logistics.
What exactly is VGM
VGM refers to the total weight of the container once loaded — the sum of the cargo weight, dunnage and securing materials, pallets where applicable, and the container's own empty weight (the tare weight, printed on the container door). It is therefore not simply the weight of the cargo being shipped, but the full gross weight of the unit as it is ready to be loaded.
This requirement grew out of a straightforward concern: containers with inaccurate declared weights can compromise vessel stability, distort stowage plans, and create risks for port personnel handling cranes and lifting equipment. The SOLAS convention (Safety of Life at Sea), under the International Maritime Organization, made weight verification mandatory before loading for all containers moved by sea, worldwide.
Who is responsible for declaring the VGM
Under international regulation, responsibility for providing the VGM lies with the shipper named on the bill of lading — the party that booked the shipment with the ocean carrier or its forwarder. In practice, several parties may be involved in obtaining this information:
- The shipper or its representative, who may weigh the container or calculate its weight.
- The terminal or weighing facility operator, when a physical weighing is carried out at that location.
- The freight forwarder, such as VELOX Logistics, who supports the transmission of the VGM to the carrier within the required booking timeline.
Even when the forwarder facilitates transmission of the information, legal responsibility for the accuracy of the VGM remains with the shipper listed on the shipping documents. Providing a reliable figure from the start is therefore essential.
The two recognized methods for obtaining VGM
International regulation recognizes two main methods for establishing a container's VGM. The choice between them depends on available equipment and cargo type.
Method 1: Weighing the packed and sealed container
This method involves weighing the container once it is fully loaded, secured, and sealed, using calibrated and certified weighing equipment (for example, a terminal or container yard scale). The result obtained is used directly as the VGM, with no further calculation required.
Method 2: Adding up individual weights
This method involves weighing each package, pallet, or vehicle loaded into the container separately, then adding those weights to the weight of the securing materials and the container's tare weight (shown on the container door). This approach requires care, since each item must be weighed individually with appropriate equipment, and nothing should be missed in the final total, including dunnage, straps, or pallets.
In either case, the weighing equipment used must meet the requirements applicable in the country where the weighing takes place. For details on the exact requirements at your loading point, contact VELOX Logistics.
How VGM fits into the booking process
The VGM must be submitted to the ocean carrier before a deadline it sets, typically tied to the booking cut-off for the vessel in question. This process is part of the same documentation chain described in our article on how ocean freight booking works.
In practice, once a container is loaded at the shipper's site or at the forwarder's warehouse, the weight information follows its own transmission path, separate from commercial documentation such as the invoice or packing list. The VGM is submitted in writing — often through an electronic system — to the ocean carrier or its agent, who incorporates it into the vessel's stowage plan.
If this step is skipped or the information arrives after the set deadline, the container may be delayed, with a possible rollover to the next available sailing. It is therefore recommended to prepare the VGM in advance, particularly when loading takes place directly at the shipper's premises.
What happens if the VGM is missing or inconsistent
When a container arrives at the port terminal without a valid VGM, the general rule applied by ocean carriers and port authorities is simple: the container cannot be loaded onto the vessel until this information is provided. This can result in the shipment being delayed, with practical consequences down the supply chain — such as coordination with inland trucking or planning on the receiving end.
A VGM that is clearly inconsistent — for example, significantly different from the weight declared in commercial documents — may also trigger additional checks by the terminal or carrier, which can likewise cause delays. This underscores the importance of consistency across a shipment's documents, a topic covered more broadly in our guide to essential ocean shipping documents.
VGM and stowage: related but distinct concerns
VGM addresses the total declared weight of the container, but it does not replace the need for proper internal stowage of the cargo. A correctly weighed container can still be internally unbalanced if the load is not distributed evenly. These two aspects — overall declared weight and physical distribution of contents — are complementary and both essential to safe transport.
For best practices on weight distribution and securing cargo inside the container, see our article on how to load a shipping container.
VGM by type of shipment
| Type of shipment | VGM consideration |
|---|---|
| Full container (FCL) loaded at the shipper's site | The shipper or its forwarder calculates or arranges weighing of the container before delivery to the terminal |
| Consolidation (multiple shippers in one container) | The overall VGM is established once the container is consolidated, coordinated by the forwarder |
| Vehicle export in a container | The weight of the vehicle(s) must be included in the calculation, along with any personal effects |
| Container of wholesale used clothing | Bale weights are generally consistent, which simplifies the individual-weight addition method |
Why VGM matters beyond compliance
Beyond meeting SOLAS requirements, an accurate VGM contributes directly to safer vessel operations. Ships are stowed according to a carefully calculated plan that accounts for the declared weight of every container on board. When that data is accurate, terminal operators can plan crane movements and yard positioning more reliably, and vessel planners can distribute weight across the ship in a way that supports stability throughout the voyage.
For shippers, this translates into fewer unexpected delays. A shipment with a properly documented VGM moves through the booking and terminal process without the friction that can arise from last-minute weight verifications or corrections. This is particularly relevant for time-sensitive cargo, such as personal effects or goods tied to a specific arrival window at destination.
Practical tips for a smooth VGM process
- Confirm early with your forwarder which of the two recognized methods will be used for your shipment, and gather the required weight information accordingly.
- Keep a written record of every weight used in the calculation, especially when relying on the addition method, in case verification is requested.
- Communicate any changes to the cargo composition after the initial VGM calculation, since added or removed items affect the total.
- Coordinate the VGM submission timeline with your overall booking schedule, particularly when working with tight cut-off windows.
- Ask your forwarder to confirm once the VGM has been successfully transmitted and accepted by the carrier, rather than assuming it was processed.
Common mistakes to avoid
- Waiting until the last minute to submit the VGM, risking a missed booking cut-off.
- Forgetting to include dunnage or securing materials in the addition method.
- Using an inaccurate or estimated tare weight instead of the one printed on the container door.
- Treating VGM as a purely administrative formality unrelated to transport safety.
- Failing to check consistency between the VGM and the weight declared in other shipping documents.
How VELOX supports you
At VELOX Logistics, we integrate VGM management into the ocean freight booking process for every container, whether it's a full FCL shipment, a consolidation load, or a vehicle export. Our team guides you on the method best suited to your situation and ensures the information submitted to the ocean carrier meets applicable requirements.
Whether you are shipping from Montreal to Abidjan, Dakar, or any other destination we serve, we coordinate this step alongside the rest of your documentation to avoid avoidable delays.
FAQ
Is VGM mandatory for all containers?
Yes, the verified gross mass requirement applies to all containers moved by sea under the SOLAS convention, regardless of the type of cargo being shipped.
Who must provide the VGM to the ocean carrier?
Responsibility lies with the shipper named on the bill of lading, although the freight forwarder can help collect and transmit this information.
Are the VGM and the weight shown on the commercial invoice the same thing?
No. The VGM includes the container's tare weight and securing materials in addition to the cargo weight, while the commercial invoice typically covers only the weight or value of the goods.
What happens if the VGM is not submitted on time?
The container may not be loaded onto the intended vessel and could be rolled over to a later sailing, depending on availability.
Can a weighing done at the forwarder's warehouse be used?
This depends on the equipment used and whether it meets applicable requirements. Contact VELOX Logistics to confirm the appropriate method for your situation.
Does VGM apply to consolidation containers too?
Yes. When multiple shippers share a container as part of a consolidation shipment, the VGM is established for the entire consolidated container, generally coordinated by the forwarder.
Do I need to weigh my vehicle before export?
The vehicle's weight is part of the VGM calculation when it is loaded into a container. Our team can guide you on the appropriate method based on the loading arrangement used.
Does VGM replace the need for proper stowage?
No. VGM concerns the total declared weight, while stowage concerns the physical distribution of the load inside the container. Both are complementary to safe transport.
In summary
VGM is a mandatory, unavoidable step before any ocean container can be loaded. Understood and planned properly, it fits smoothly into the booking process and avoids last-minute delays. Contact VELOX Logistics or message us on WhatsApp to coordinate this step alongside the rest of your shipping file.
