The VGM is not a number the forwarder can guess. Under SOLAS, the shipper named on the bill of lading is responsible for the verified gross mass, even when a trucker, warehouse, or forwarder does the weighing. The container cannot be loaded without a VGM that reaches the carrier and terminal before the cut-off. A wrong number can trigger a reweigh, a hold, a rollover, and a bill. The practical fix is a handoff: the factory or CFS records the weight, the trucker keeps the weighbridge ticket, the forwarder reconciles the figures, and an authorized person signs the declaration. This article shows the sequence, the two weighing methods, and the fields to check before submission.
What the VGM Actually Includes
VGM means the total weight of the packed container. It includes the cargo, the cartons and pallets, the dunnage and securing material, and the container’s own tare weight. It does not mean the cargo net weight on the commercial invoice. It does not mean the weight the factory estimated from a carton count. It does not mean the trucker’s guess at the gate.
The distinction matters because the number is used for stowage planning. A container declared at 18 tonnes that actually weighs 26 tonnes changes how the vessel is loaded and how it behaves at sea. The terminal may use the VGM to plan crane lifts and stack positions. The master may use it to decide whether the container can be loaded at all. A number that is too low is not a harmless paperwork error.
Ask for the tare weight from the container number, not from an old file. Container tare can vary between boxes of the same size. If the container is swapped at the last minute, the tare and the VGM change with it. The same applies to pallets: a supplier that switches from light plastic pallets to heavy wood pallets can add hundreds of kilograms without changing the cargo count.
Two Approved Weighing Methods
SOLAS recognizes two methods. Method 1 weighs the packed container on a calibrated scale. The container is weighed as a whole, and the result is the VGM. This is the simplest method when a weighbridge or a calibrated container scale is available at the factory, CFS, or terminal.
Method 2 weighs the cargo and packing materials separately, then adds the container tare. The cargo may be weighed on a calibrated platform scale, the packing and securing material may be weighed separately, and the tare is taken from the container’s door plate or a verified source. Method 2 requires a documented calculation, and the weighing procedure must be approved or certified by the competent authority in the jurisdiction where the weighing takes place. If you are unsure how the local authority applies it, ask the forwarder or terminal to confirm the accepted procedure before the container is weighed. It is useful when the container cannot be moved to a weighbridge, but it is only as good as the individual weights and the addition.
Either method needs calibrated equipment and a record. Keep the weighbridge ticket, the scale calibration date, the container number, the tare, and the person who took the reading. A VGM without a ticket is a number without a source. If the terminal later reweighs the box, the ticket is your evidence that the original declaration was based on a real measurement, not an estimate.
Who Does What in the Handoff
The legal responsibility sits with the shipper named on the bill of lading. That party may be the buyer, the seller, or a trading company, depending on how the bill is issued. The shipper can delegate the weighing to a factory, a CFS, a trucker, or a forwarder. Delegation does not transfer the legal responsibility. If the number is wrong, the shipper is the party the carrier and the regulator will look to first.
In practice, the handoff usually looks like this. The factory or CFS weighs the packed container or provides the cargo and packing weights. The trucker carries the container to the port and keeps the weighbridge ticket. The forwarder checks the figures against the booking, the container number, and the tare. The shipper’s authorized signatory signs the VGM declaration. The forwarder submits it to the carrier or terminal in the required format before the cut-off.
の ocean forwarder usually owns the submission step, but the shipper still owns the accuracy. That split is the source of most disputes: the forwarder can send the file, but it cannot verify a weight it never measured. Each handoff needs a name and a timestamp. A VGM that arrives by WhatsApp without a container number is not a VGM. A ticket that shows the truck’s gross weight but not the container number cannot be matched to the booking. A declaration signed by someone who has not seen the ticket is a weak link. Build the chain so every number can be traced to a person and a document.
The Cut-Off Is Not the Same as the Booking Cut-Off
The VGM cut-off is often earlier than the cargo cut-off. The carrier needs the weight before it can finalize the stowage plan. If the VGM arrives late, the container may miss the vessel even though the cargo was at the terminal on time. Ask the forwarder for the exact VGM cut-off, the submission format, and the terminal’s cut-off in writing. Do not assume that a booking confirmation with a gate-in deadline also covers the VGM deadline.
The submission format matters too. Some carriers accept a portal upload, some require a specific EDI message, and some require the forwarder to submit on the shipper’s behalf. The declaration usually needs the container number, the VGM, the unit of measure, the weighing method, the date, and the authorized signatory. If the carrier’s system rejects the file because a field is missing, the clock keeps running.
For an FCL shipment, the VGM deadline is usually tied to the carrier’s stowage plan, so a late file can affect the whole allocation, not just one container. Ask for a submission receipt. A sent email is not proof that the carrier received and accepted the VGM. A portal confirmation or an EDI acknowledgment is better. If the container is rolled, the receipt helps show whether the VGM was late or the carrier’s planning was the cause.
What Happens When the Number Is Wrong
Terminals and carriers apply their own difference thresholds, and the threshold can vary by port. Ask the forwarder for the applicable threshold and reweigh policy in the same written reply. If the terminal reweighs the container and finds a material difference, the terminal’s verified weight generally takes precedence. The carrier may hold the container, require a corrected VGM, reweigh it again, or refuse loading. The costs can include a reweigh fee, storage, demurrage, detention, a booking amendment, and a rebooking fee if the container misses the vessel.
A container that exceeds its permitted maximum gross mass may not be loaded at all. That is a safety limit, not a commercial negotiation. The master also retains discretion to reject a container even after a VGM is supplied. If the cargo is poorly stowed or the weight distribution looks wrong, the carrier can ask for more information or refuse the box.
Correct the number as soon as the error is known. Send a written correction to the carrier and terminal, keep the original ticket and the corrected ticket, and ask for confirmation that the new VGM has been accepted. Do not wait for the vessel to arrive to fix a weight that was wrong at loading.
A Five-Step VGM SOP
First, confirm the container number and tare before loading. If the container is swapped, restart the VGM record. Second, weigh the packed container on a calibrated scale, or complete the Method 2 calculation with separate weights for cargo, packing, and tare. Third, match the weight to the booking and the container number, and convert the unit correctly. Fourth, have the authorized signatory sign the declaration and submit it to the carrier or terminal before the cut-off. Fifth, keep the ticket, the calculation, the submission receipt, and the carrier’s acceptance in one file.
The SOP should name who does each step and what happens when a step fails. If the factory cannot weigh the container, who takes it to a weighbridge? If the trucker’s ticket is illegible, who reweighs? If the forwarder’s portal is down, who sends the backup file? A VGM process that depends on one person’s memory is not a process. If the cargo is consolidated at a China warehouse, the CFS should issue the packed weight and the container number together.
Common Errors That Trigger a Reweigh
The most common error is using the cargo net weight and forgetting the packaging, pallets, and container tare. The second is using an estimated carton weight instead of a measured weight. The third is a unit conversion error between kilograms and pounds. The fourth is a rounding error that becomes material on a heavy load. The fifth is a last-minute container swap that leaves the old tare in the file. The sixth is a missing signature or a signature from someone without authority. The seventh is a VGM submitted after the cut-off but assumed to be on time.
None of these errors requires bad faith. They happen because the VGM is treated as a paperwork step at the end of loading rather than a measurement step at the start. Move the VGM earlier in the process and the errors become visible while there is still time to fix them.
What to Ask Before the Container Is Loaded
Ask the forwarder five questions before the container is sealed. What is the exact VGM cut-off, and is it earlier than the gate-in deadline? Which weighing method will be used, and who owns the scale calibration? Will the terminal reweigh the container, and who pays if it does? How will the VGM be submitted, and what receipt will the shipper receive? Who is the authorized signatory if the usual person is unavailable? The answers should be in writing, not in a phone call.
Ask the factory or CFS three more. What is the measured weight of the packed cargo, including pallets and securing material? What is the container tare from the actual box, not from a template? Can the weighbridge ticket be sent with the container number visible? If the answer to any of these is an estimate, the VGM is not ready. Keep the answers in the same file as the weighbridge ticket so the next shipment starts from the same checklist.
Send One Email Before the VGM Goes Out
Put the container number in the subject line and ask for four things in one email: the VGM cut-off, the gate-in date, the accepted submission format, and a receipt once the carrier has linked the VGM to the container and the stowage plan. Send the same email to the factory and the trucker so they see the real deadline, not just the booking date. Then attach the weighbridge ticket and the signed declaration to the same thread. If you want the handoff checked before booking, send the container number and draft VGM to our team。
