VGM (Verified Gross Mass): SOLAS Container Weight Rules Explained
VGM stands for Verified Gross Mass, and it is the verified total weight of a packed shipping container that the shipper must declare before that container can be loaded onto a vessel. The requirement comes from the International Maritime Organization (IMO) under the Safety of Life at Sea (SOLAS) convention, and it has applied worldwide since July 1, 2016. If the carrier and terminal do not receive a valid VGM, the container does not get loaded. There is no informal workaround, which is why VGM sits at the center of every ocean export booking.
Key Takeaways
- VGM stands for Verified Gross Mass, the verified weight of cargo plus packaging plus the empty container itself (the container tare weight).
- It is a mandatory SOLAS requirement enforced globally since July 1, 2016, and the shipper named on the bill of lading is legally responsible for providing it.
- There are two approved weighing methods: Method 1 weighs the fully packed container, and Method 2 adds up individual item weights plus the tare weight.
- VGM must reach the carrier or terminal before the carrier's documentation cut-off, which is typically one to three days before vessel departure.
- A missing, late, or inaccurate VGM means the container is not loaded, triggering rebooking fees, storage charges, and delayed shipments.
What VGM Means in Shipping
Verified Gross Mass is the single declared figure that tells a carrier exactly how heavy a packed container is before it is stacked on a ship. It is not an estimate and not the cargo weight alone. VGM is the combined weight of three things: the cargo, all packaging, dunnage, and securing materials inside the box, and the tare weight of the empty container as stamped on the container door.
Verified Gross Mass (VGM) is the total verified weight of a packed container, calculated as the weight of the cargo plus all packing and securing material plus the empty container tare weight. Under SOLAS, this figure must be provided in writing to the ocean carrier by the shipper before the container is loaded onto a vessel.
The acronym answers most of the questions shippers actually ask. "What does VGM stand for?" Verified Gross Mass. "What is VGM in shipping?" The verified weight of a loaded container that SOLAS requires before vessel loading. The term is used identically across every major trade lane, so a VGM filed for a container leaving Shanghai means the same thing as one filed in Rotterdam or Long Beach.
Why SOLAS Made VGM Mandatory
The VGM rule exists because misdeclared container weights were causing real damage at sea and on shore. SOLAS is the International Maritime Organization treaty that governs ship safety, and the VGM requirement sits inside SOLAS Chapter VI, Regulation 2. The amendment took effect on July 1, 2016, and applies to every container moving under a SOLAS voyage, which in practice means almost all international ocean freight.
Before the rule, carriers regularly loaded vessels using weights that shippers had estimated or simply copied from a previous shipment. Underdeclared boxes threw off vessel stowage plans and stability calculations. Overstacked or misplaced heavy containers contributed to lost boxes overboard, collapsed stacks, chassis failures during trucking, and crane and lashing accidents at the terminal. By forcing a single verified number into the booking, SOLAS gave carriers an accurate basis for stowage and stability, and gave terminals a reliable figure for crane and equipment limits.
The Two Approved VGM Weighing Methods
SOLAS allows exactly two methods to determine VGM. A shipper may use either one, but the method must be approved and the result must be a verified figure, not a guess. Many shippers use Method 1 for dense single-commodity loads and Method 2 for mixed consolidations where individual item weights are already known.
| Aspect | Method 1: Weigh the Packed Container | Method 2: Calculate by Adding Weights |
|---|---|---|
| How it works | Weigh the entire container after it is fully packed and sealed, using a calibrated weighbridge or scale. | Weigh every item, pallet, package, dunnage, and securing material, then add the container tare weight. |
| What you need | Access to a certified, calibrated weighbridge that meets national accuracy standards. | Accurate weights for all contents plus the tare figure printed on the container door. |
| Best for | Full container loads of a single dense commodity, or any cargo with uncertain weights. | Palletized or consolidated cargo where each item weight is already documented. |
| Approval note | Equipment must be certified to local regulations. | The calculation method must be approved by the competent national authority. |
Both methods land on the same figure: the total verified weight of the loaded box. For full container load shipments where you control the entire container, the choice between methods is yours to make. If you want a deeper look at how container sizing affects packing and weight planning, see our guide to shipping container dimensions.
Who Is Responsible for VGM
The shipper is legally responsible for the VGM. Specifically, it is the legal entity or person named as the shipper on the carrier's bill of lading. That party must determine the verified weight using one of the two approved methods and submit it to the carrier in time for vessel loading.
In practice the work is often delegated. A freight forwarder, a Container Freight Station, a packing facility, or a third-party logistics provider may perform the weighing and file the VGM on the shipper's behalf. Delegation does not transfer the legal responsibility. The shipper named on the bill of lading remains accountable for the accuracy of the declared figure, even when another party did the weighing. This is why forwarders treat VGM as a controlled step in the export workflow rather than an afterthought, and why software that runs ocean freight management keeps the VGM status visible on every booking.
How the VGM Filing Process Works
VGM is one defined step inside the ocean export booking flow. The sequence below shows where it fits and what each stage involves.
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1Pack and seal the containerCargo is loaded into the container at the shipper warehouse or a Container Freight Station, with all packaging and securing material in place. The box is then sealed.
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2Determine the verified weightApply Method 1 by weighing the packed container on a calibrated weighbridge, or apply Method 2 by adding all item weights to the container tare weight.
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3Prepare the VGM declarationRecord the verified figure on the VGM document with the booking number, container number, weighing method, and the signature of an authorized person representing the shipper.
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4Submit before the cut-offSend the VGM to the carrier or terminal through the agreed channel, which may be an electronic data interchange message, a carrier portal, or a forwarder system, ahead of the VGM cut-off time.
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5Carrier confirms and loadsThe carrier uses the VGM in the vessel stowage plan. Only containers with a valid, on-time VGM are cleared for loading onto the ship.
Across a busy export desk, the failure point is rarely the weighing itself. It is tracking which of dozens of live bookings still need a VGM filed before each vessel cut-off. Running this on a single platform with workflow automation turns VGM from a manual checklist into a status that updates against each booking automatically.
VGM Deadlines and Cut-Off Times
VGM must reach the carrier before the carrier's VGM cut-off, which is a separate and usually earlier deadline than the cargo gate-in cut-off. There is no single global deadline. Each carrier and terminal sets its own VGM cut-off for each vessel and voyage, and it is typically published on the booking confirmation.
As a working rule, the VGM cut-off falls one to three days before the vessel's scheduled departure. The exact timing depends on the port, the terminal, and the carrier. The practical point for shippers is to read the cut-off on each booking confirmation and treat it as a hard deadline, because it determines whether the container makes the intended sailing.
What Happens if You Miss or Misdeclare VGM
VGM is enforced as a load-or-no-load condition. The consequences of getting it wrong are operational and financial rather than a fixed fine, and they fall on the shipper.
A container with no valid VGM by the cut-off is rolled to a later vessel. The shipper then absorbs rebooking and amendment fees, port storage and demurrage charges while the box waits, and the cost of a delayed shipment to the end customer. A VGM that is later found to be materially inaccurate can lead the carrier to demand reweighing at the shipper's expense, and repeated misdeclaration can put a shipper account under carrier scrutiny.
On top of those direct costs, some carriers and terminals apply a VGM-related handling or amendment charge when a declaration is missing, late, or corrected after submission. The amount varies by carrier and port. The reliable way to avoid all of it is the same: file an accurate VGM, through the right channel, before the cut-off.
VGM in the Wider Export Workflow
VGM does not stand alone. It connects to the booking, the container number, the packing operation, and the shipping documents that follow. The verified weight feeds the carrier stowage plan, and the same shipment record carries through to the bill of lading. When the VGM, the booking, and the documentation all sit in one shipment record, an export team can see at a glance which containers are cleared to load and which are still waiting.
That visibility is the difference between a calm export desk and a scramble at every cut-off. Forwarders that manage VGM, container status, and milestones together with shipment tracking and operations software remove the spreadsheet step and the late-night carrier emails that come with it.
VGM is one cut-off among many on every ocean export booking. See how GoFreight keeps weight, documents, and milestones on one cloud platform so nothing misses the vessel.
Request a GoFreight Demo →Frequently Asked Questions
What does VGM stand for?
VGM stands for Verified Gross Mass. It is the verified total weight of a packed shipping container, made up of the cargo, all packaging and securing material, and the tare weight of the empty container.
What is VGM in shipping?
In shipping, VGM is the verified weight of a loaded container that the shipper must declare to the ocean carrier before that container can be loaded onto a vessel. It is required under the SOLAS convention and has applied worldwide since July 1, 2016.
What is the full form of VGM?
The full form of VGM is Verified Gross Mass. The same three words are used across every ocean trade lane, so the term means the same thing whether a container ships from Asia, Europe, or North America.
How do you calculate VGM?
There are two approved methods. Method 1 is weighing the fully packed container on a calibrated weighbridge. Method 2 is adding up the weights of all cargo, packaging, and securing material, then adding the container tare weight printed on the door. Both methods produce the same figure: the total verified weight of the loaded box.
Who is responsible for providing the VGM?
The shipper named on the carrier's bill of lading is legally responsible for the VGM. A forwarder, packing facility, or Container Freight Station can perform the weighing and file the declaration, but delegating the task does not transfer the legal responsibility away from the shipper.
What is the VGM weight made up of?
VGM weight is the sum of three parts: the cargo itself, all packaging, pallets, dunnage, and securing material inside the container, and the tare weight of the empty container. It is not the cargo weight alone.
When is the VGM deadline?
There is no single global deadline. Each carrier and terminal sets its own VGM cut-off for each vessel and voyage, published on the booking confirmation. As a working rule the VGM cut-off falls one to three days before the vessel departs, and it is usually earlier than the cargo gate-in cut-off.
What happens if VGM is missing or late?
A container without a valid VGM by the cut-off is not loaded and is rolled to a later vessel. The shipper then absorbs rebooking fees, port storage and demurrage charges, and the cost of a delayed shipment. Some carriers and terminals also apply a handling or amendment charge for a missing, late, or corrected VGM.
Is a VGM charge or fee applied to shipments?
Some carriers and terminals apply a VGM-related handling or amendment fee, most often when a declaration is missing, submitted late, or corrected after the cut-off. The amount varies by carrier and port. Filing an accurate VGM on time through the correct channel is the reliable way to avoid these charges.
