VGM (Verified Gross Mass): The Container Weighing Rule Every Sea Freight Shipper Must Follow

Every container that goes onto an ocean vessel today needs a Verified Gross Mass, or VGM, on file before it can be loaded — and this is not a paperwork formality that gets waved through. A container missing a valid VGM by the shipping line’s cutoff is simply left off the vessel, no exceptions, which means your cargo misses that sailing and waits for the next available space. Many first-time exporters and importers using sea freight have never heard of VGM until the week their shipment gets rolled, so it is worth understanding exactly what the rule requires before you are the one troubleshooting it at the port.

Where the Rule Actually Comes From

VGM is not a shipping line policy that carriers could choose to waive — it is a binding requirement under SOLAS, the International Convention for the Safety of Life at Sea, administered by the International Maritime Organization. The amendment took effect on 1 July 2016 following a series of container ship stability incidents and vessel accidents that investigators traced partly to inaccurate declared cargo weights throwing off the vessel’s stowage plan. Because it is a SOLAS requirement rather than a single carrier’s rule, it applies uniformly across shipping lines and ports worldwide, including at Chattogram, meaning there is no carrier you can use to avoid the requirement.

Why an Inaccurate Weight Is a Safety Problem, Not Just a Compliance One

A container ship’s stowage plan is built around the declared weight of every box on board — heavier containers generally need to sit lower in the stack, and the vessel’s overall weight distribution affects its stability at sea. If enough containers carry inaccurate declared weights, the actual loaded vessel can end up meaningfully different from what the stowage software calculated, in the worst cases contributing to a container stack collapsing or affecting the ship’s balance in rough weather. That is the underlying safety logic behind why terminals enforce the VGM cutoff strictly rather than treating it as a formality — it directly feeds into how the vessel is loaded.

Method 1: Weighing the Whole Container

SOLAS allows two ways to arrive at a VGM, and Method 1 is the more straightforward: weigh the entire packed and sealed container, including all cargo, packing materials, and dunnage, on a calibrated and certified weighing scale. This is typically done at the container yard, the factory (if it has certified weighbridge equipment), or a dedicated weighing station along the trucking route to port. The scale used has to be certified and regularly calibrated under the relevant national metrology framework — an uncertified weighbridge reading is not accepted as a valid VGM. Method 1 is generally considered more reliable because it captures the actual total weight directly rather than relying on a calculation.

Method 2: Adding Up the Components

Method 2 works differently: instead of weighing the packed container as a whole, the shipper weighs or calculates the weight of each item of cargo and all packing and securing materials individually, then adds the container’s own tare weight (printed on the container door) to get the total. This method is only permitted for shippers operating under a certified quality management system in many jurisdictions, because it depends entirely on the accuracy of the individual component weights being fed into the calculation — a single wrong SKU weight or miscounted carton quantity throws off the final figure. For most Bangladeshi importers relying on a Chinese factory’s packing list to build a Method 2 calculation, this is where the honesty and precision of the supplier’s own documentation becomes directly load-bearing.

The Cutoff You Might Not Know Exists

This is where shipments most often go wrong: the VGM submission deadline (often called the SI cutoff or VGM cutoff) is frequently earlier than, and separate from, the documentation cutoff many shippers are used to tracking for the bill of lading and other paperwork. Missing the VGM cutoff specifically — even if every other document is submitted on time — is enough on its own for the terminal to refuse loading and roll the container to the next available vessel. Because this cutoff sits with the terminal or shipping line rather than being something your freight forwarder can negotiate after the fact, the only real protection is building VGM submission into your shipment checklist from day one rather than treating it as something to sort out closer to loading.

What a Rolled Container Actually Costs You

It is worth being concrete about what happens when a container misses its VGM cutoff, because the consequences go beyond a simple delay. The container typically sits at the terminal waiting for the next available vessel with capacity on the same route, which for some China-Bangladesh lane combinations can mean a wait measured in days rather than hours depending on sailing frequency. During that wait, the container is usually accruing storage charges at the terminal, on top of whatever detention charges may apply to the equipment itself — costs that fall on the shipper regardless of whether the missed cutoff was the shipper’s error or a documentation delay further up the chain. None of this is a theoretical risk to plan around casually; it is a direct, quantifiable cost that a missed VGM cutoff creates every time it happens.

VGM at Chattogram and Mongla

Because VGM is an IMO SOLAS requirement rather than a rule any individual port sets independently, Chattogram and Mongla enforce it the same way ports elsewhere do — through the terminal operating system that manages vessel stowage planning. For export shipments originating in Bangladesh, this means exporters face exactly the same VGM cutoff discipline that importers need to manage on the China side, and the same choice between weighing methods applies. Freight forwarders operating out of Chattogram are generally well practised at building VGM into their standard shipment checklist, but it remains worth confirming directly on every booking rather than assuming it is automatically handled, particularly for exporters working with a forwarder for the first time.

Practical Steps to Avoid a Rolled Container

The safest approach for most shippers is Method 1 through a certified weighbridge at the container yard, simply because it removes the dependency on a supplier’s packing list accuracy. If your factory or forwarder proposes Method 2, ask specifically what quality management certification permits them to use it, since an uncertified Method 2 declaration can be rejected by the terminal just as readily as a missing VGM. Always confirm the VGM cutoff time separately from the general documentation cutoff when your forwarder sends the sailing schedule — do not assume they are the same deadline.

• VGM is a SOLAS/IMO requirement effective since July 2016 — it applies at every port worldwide, not just certain carriers.
• Method 1: weigh the full packed container on a certified, calibrated scale — generally the more reliable option.
• Method 2: sum individual cargo and packing weights plus container tare weight — only valid under a certified quality management system in many jurisdictions.
• The VGM cutoff is often earlier than the general documentation cutoff — confirm it separately for every booking.
• Missing the VGM cutoff means the container is left off the vessel entirely, with no exception process at most terminals.

How We Handle VGM for Our Shipments

Getting VGM right is one of dozens of small compliance details that determine whether a sea freight shipment sails on schedule or sits waiting for the next vessel. At DE International, VGM submission is built into our standard sea freight process for every container we book, so our clients do not have to track this cutoff separately from everything else involved in a shipment. If you have a sea freight shipment coming up and want to confirm your VGM and documentation timeline, talk to our team, or browse our full shop and sourcing and buying agent service for end-to-end support.