The first time I watched a full 40-foot container get pulled off a sailing at a European terminal, it was not customs and it was not the cargo. The booking had no verified gross mass on file by the carrier's cut-off, so the crane operator simply skipped it. That box sat for another week. If you export full-container ocean freight, here is the rule I wish every new shipper learned on day one: a packed container with no submitted VGM does not get loaded, and the shipper named on the bill of lading owns that obligation even when someone else runs the scale.
I book containers for clients at GetTransport.com, and I see the same VGM mistakes cost real money at the quay. This guide walks through what the verified gross mass actually is, where the law comes from, who carries the liability, the two weighing methods, and how we keep bookings from getting rolled. I have kept it current for 2026.
What the verified gross mass actually is
The verified gross mass, or VGM, is the weight of a packed, sealed export container in its ready-to-ship state. It is not the weight of your cargo alone. It bundles everything the crane is about to lift off the ground.
- The cargo you loaded.
- All packaging, pallets, bracing and dunnage used to secure that cargo.
- The tare weight of the empty container itself.
Add those together and you have the number the vessel planner needs. Why does the ship's crew care so much? Because stowage software builds the loading plan around declared weights. Get a heavy box mislabelled as light and it can end up stacked in the wrong tier, which affects the vessel's stability and the stack loads below deck. Under-declaration has been linked to collapsed stacks and containers lost overboard, and that is the safety gap the rule was written to close.
The legal basis: SOLAS Chapter VI, Regulation 2
VGM is not a carrier preference or a terminal quirk. It is international law. The International Maritime Organization amended the Safety of Life at Sea (SOLAS) Convention, and the requirement lives in SOLAS Chapter VI, Regulation 2, on cargo information. It took effect on 1 July 2016 and has applied to every loaded export container worldwide since that date.
Alongside the treaty text, the IMO published operational guidance in circular MSC.1/Circ.1475. That circular is where the two permitted weighing methods are spelled out, and it is what national maritime administrations lean on when they write their local rules. SOLAS sets the floor. Each flag state and port state then implements it through domestic regulation, which is why some of the practical detail changes when you cross a border.
One point that trips people up: SOLAS applies to the vessel and the international voyage, so the VGM obligation attaches once a container is packed for ocean carriage. The domestic trucking leg before the port, including the drayage move from your warehouse or an inland depot, is not itself governed by SOLAS VGM. The weight still has to be right, though, because that same figure follows the box onto the ship.
Who is legally responsible for the VGM
This is the part I repeat on almost every call. The party legally responsible for determining and submitting the VGM is the shipper named on the ocean carrier's bill of lading. Not the trucker. Not the terminal. Not the warehouse that stuffed the box.
Delegating the physical weighing is completely fine. Many of our clients have a third-party warehouse, a packing station or a weighbridge operator do the actual measurement. That is fine. Accountability is the piece that never transfers. If the number is wrong or missing, the regulator looks at the name in the shipper box of the bill of lading. Because the bill of lading is the document that fixes this liability, it is worth understanding how the different bill of lading types work before you sign one.
A quick note for forwarders reading this. If you issue a house bill of lading as the contracting carrier, you can end up as the shipper of record on the master bill, and the VGM duty can land on you. Check whose name sits where before the vessel loads.
The two permitted methods
MSC.1/Circ.1475 allows exactly two ways to arrive at a verified figure. Eyeballing it or reusing last shipment's number is not an option.
Method 1: weigh the whole packed container
Method 1 means you pack and seal the container, then put the entire loaded box on calibrated, certified weighing equipment. A weighbridge does this well. The scale reading is your VGM, complete, with nothing left to add. This is the cleaner method for dense single-commodity loads where driving the box across a weighbridge is easy.
Method 2: weigh the contents, then add tare
Method 2 lets you weigh every item that goes inside. You count the cargo, then all the packaging and securing material that rides with it, and you add the container's tare weight on top. Where do you find the tare? It is stamped on the CSC plate, the metal safety-approval plate fixed to the container door under the 1972 Convention for Safe Containers, and it is usually stencilled on the door as well. A standard 20-foot box runs roughly 2,200 to 2,400 kg tare, a standard 40-foot around 3,750 kg, and a 40-foot high cube closer to 3,900 kg.
Here is the catch that catches people. Method 2 generally requires approval or registration from the national authority in the country of packing. Adding up a few weights on your own and calling the result verified will not fly. The competent authority in that state has to sanction the method and the process behind it. In several countries Method 2 is only accepted from operators who have registered their weighing procedure.
| Aspect | Method 1 | Method 2 |
| What you weigh | The entire packed, sealed container in one go | All contents individually, then add container tare from the CSC plate |
| Equipment | Calibrated, certified weighbridge or scale | Calibrated scales for each item, plus verified tare figure |
| National authority approval | Not usually required beyond equipment certification | Generally requires authority approval or registration of the method |
| Best fit | Dense single-commodity loads, easy weighbridge access | Mixed consolidations where each item weight is already known |
| Main risk | Weighbridge access and queue time before cut-off | Missing an item or using an outdated tare figure |
Whichever method you use, the equipment has to be calibrated and certified to the standard set by the country where the weighing happens. A bathroom-grade scale in the corner of a warehouse does not qualify.
How and when the VGM gets submitted
Determining the weight is only half the job. That verified figure then has to reach the ocean carrier and the terminal before the carrier's VGM cut-off. Miss the cut-off and the box does not make the plan, full stop. The industry shorthand is blunt: no VGM, no load. Some operators say no VGM, no stow.
The submission channel is your choice, and carriers accept several.
- As a data field inside your shipping instruction to the carrier.
- Through the carrier's own web portal or shipping platform.
- By EDI, using the VERMAS message that the SMDG standards group released specifically to carry VGM data between shipper and carrier.
The VGM cut-off is separate from, and usually earlier than, other documentation deadlines. In our experience it lands somewhere between 24 and 72 hours before the vessel's arrival, and it is often a few hours ahead of the standard shipping-instruction cut. I have watched shippers hit the doc cut comfortably and still miss the VGM window because they treated them as the same clock. They are not.
Every submission needs the same core data set. The VGM figure with its unit, the container number, the shipper's name as it appears on the bill of lading, the booking reference, and the method used to weigh, sometimes with the responsible party and authorised signatory. Carriers reject VGMs with a missing or mismatched container number every day, so proofread that field.
Tolerances, wrong weights, and the penalties
SOLAS itself does not publish a numerical tolerance. It expects an accurate verified figure. National administrations vary in how they treat small discrepancies. Some publish a permitted margin. The United Kingdom's Maritime and Coastguard Agency, for example, applies an enforcement tolerance of 5 percent or 500 kg, whichever is greater, in defined circumstances, while other administrations expect the declared weight to match the actual weight with no allowance at all. Do not assume a margin exists at your load port. Confirm it, and note that several administrations have tightened rather than relaxed, a number of them around Method 2 approvals in particular.
When the VGM is late, missing or wrong, the costs stack up quickly, and they are almost always the shipper's to bear.
- Roll-over. The container misses its booked sailing and waits for the next available vessel, which on some trades means a week or more.
- Storage and demurrage. A box stranded at the terminal accrues charges while it sits.
- Re-weighing fees. If the terminal has to weigh the container to produce a figure, that service is billed back, and it is rarely cheap.
- Financial penalties. Where a national authority treats a materially false declaration as a regulatory breach, fines can follow, and repeat offenders draw scrutiny.
Carriers have also sharpened their own VGM economics in 2026, separate from any government penalty. Maersk moved its weight discrepancy fee to the cut-off stage from 7 May 2026, applying it when the VGM and the weight declared in the shipping instruction diverge by more than 3,000 kg for standard dry and reefer equipment, and it added a pre-notification alert that flags a mismatch before the deadline so you can fix it. Weight-based surcharges have appeared too. Maersk applied a heavy-load surcharge on its Far East to Europe trades for 20-foot units with a VGM above 25 tonnes from late May 2026, while CMA CGM runs an overweight surcharge on heavy 20-foot dry boxes, for instance at or above 20 tonnes on the Asia to North Europe lane. Check the live tariff for your carrier and trade lane before you quote a client, because these thresholds and fees move.
Congestion multiplies all of this. At the world's busiest container ports, a rolled box does not simply wait its turn in a quiet yard. It competes for space and equipment with thousands of others, and the storage clock does not pause. One case still stings. A client sent his VGM about 40 minutes after the carrier's cut-off, sure that 40 minutes could not matter. The planner had already closed the stowage plan. The box rolled to the next sailing four days out. By the time we cleared it, the accessorial bill had climbed into four figures. Storage did most of the damage. A terminal re-weighing charge and a chassis re-position finished it, and every cent sat with the shipper.
How we keep clients from missing the VGM cut-off
Most rolled bookings I see were preventable with a calendar and a checklist. Here is the routine we run on the marketplace side so a booking does not fall over at the terminal.
We pin the VGM cut-off first, before we even confirm the trucking. The carrier's VGM deadline becomes the anchor date, and the packing and weighing slot gets scheduled to land ahead of it with margin to spare. We treat the doc cut and the VGM cut as two different deadlines, because they are.
We confirm the weighing method with the load-port facility in advance. If a client wants Method 2, we check that the packing site actually holds the national authority registration for it, rather than discovering at the last hour that only Method 1 is accepted there. We verify the tare figure against the CSC plate, not against a spreadsheet that might be years out of date.
We submit early and get the carrier's acknowledgement. A VGM sitting in your outbox is not a submitted VGM. We watch for the carrier to accept it, and we re-check the container number in the confirmation. This matters even more when the export is time-sensitive downstream, for instance when a delayed sailing pushes back the whole clearance timeline and you are counting on how long customs clearance takes at destination.
None of this is glamorous. If you carry one habit from this page into your next booking, make it this. The error that rolls more boxes than any weighbridge fault is a VGM that leaves the outbox after the cut-off, or one that arrives with a wrong digit in the container number. So we work backwards from the carrier's deadline and submit the day before, never the morning of. Then we wait for the acceptance message and read the container number back against the booking. Put the VGM cut-off in your calendar ahead of the doc cut, and treat it as the hour the ship actually leaves. The paperwork can chase the box. The weight cannot.
Frequently asked questions
Does VGM apply to every ocean shipment?
It applies to packed containers loaded onto a ship for international carriage under SOLAS. That covers full-container-load export boxes going by sea. Break-bulk and roll-on cargo that is not in a container falls outside the container VGM requirement, though other cargo-information rules can still apply.
Can my freight forwarder submit the VGM for me?
Yes, a forwarder or a third party can weigh and transmit the figure on your behalf. The legal responsibility itself does not transfer. The shipper named on the bill of lading remains accountable for the accuracy of the declared weight, so pick a partner who does it properly.
What happens if I submit the VGM after the cut-off?
The container is very likely to miss its booked vessel. Late VGMs mean the box was not in the stowage plan when the planner built it, so it waits for a later sailing. Any storage, roll-over and re-handling charges that follow are then yours to absorb.
Where do I find the container tare weight for Method 2?
On the CSC plate fixed to the container door, and usually stencilled on the door alongside the maximum gross mass, which for a standard 20-foot or 40-foot box is 30,480 kg. Use the plate figure for that specific container, since tare varies between builds even within the same size class.
Is there an allowed margin of error on the declared weight?
SOLAS does not set one. A few national administrations permit a small tolerance, sometimes around 5 percent, while others expect an exact match. Because the allowance depends entirely on the load-port country, confirm the local rule before you rely on any margin.
What is the difference between VGM and the tare weight?
Tare is the weight of the empty container on its own. VGM is the full packed weight, so it is the tare plus everything inside, including cargo and all securing material. The tare figure is what completes a Method 2 calculation, but on its own the tare is never the VGM.