A container missing its verified gross mass does not sail — it sits at the terminal while the vessel leaves without it. That single missing number, easy to overlook amid the rest of a booking, is one of the most common reasons an otherwise ready shipment gets rolled to the next sailing. VGM is not paperwork you can catch up on later; it is a hard gate the terminal enforces before loading.
What Is VGM (Verified Gross Mass)?
VGM is the total weight of a loaded container — the cargo, all packing and dunnage, and the container's own tare weight, combined into one verified figure submitted to the carrier before the vessel loads. It exists because a container's printed maximum payload tells you what it is rated to carry, not what any given box actually weighs once packed, and carriers need the real number to plan the vessel safely.
The requirement comes from SOLAS (the Safety of Life at Sea convention) Regulation VI/2, in force since July 2016. Terminal operators use VGM figures to plan the stow — where each container sits on the vessel — because an inaccurate weight in the wrong stack position can affect vessel stability, container stack strength, and even chassis and crane load limits on the way to the berth.
Why Carriers Require It
Before SOLAS mandated VGM, container weights were frequently estimated or copied forward from prior shipments, and misdeclared weights were a recognized contributor to vessel stability incidents and container stack collapses. VGM closes that gap by making the shipper, not the carrier, legally responsible for producing a verified figure before the container is allowed on board.
Carriers and terminals treat VGM as a binding cut-off, not a soft deadline. A container that arrives at the terminal without a submitted VGM — or with one submitted after the terminal's cut-off time — is typically held back from loading regardless of how ready the rest of the shipment is. That makes VGM one of the few compliance items that can independently cause a missed sailing even when the booking, customs paperwork, and cargo itself are all in order.
The Two SOLAS-Approved Methods
SOLAS allows two ways to arrive at a verified gross mass, and the shipper chooses which one to use.
| Method 1 | Weigh the entire packed container on a calibrated scale after loading — one weighing captures cargo, dunnage, and tare together |
|---|---|
| Method 2 | Weigh the cargo and packing materials individually, then add the container's tare weight (printed on the container door) to get the total |
| Who can weigh | A certified, calibrated weighing facility or approved shipper process, depending on local regulation |
| Submitted by | The shipper named on the bill of lading, or their appointed agent |
Method 1 is generally simpler for shippers with access to a certified weighbridge at or near the packing site — one weighing, one number. Method 2 suits shippers who already track individual carton or pallet weights and want to calculate the total rather than re-weigh the finished container, but it requires an accurate, documented tare weight and disciplined record-keeping on every component that goes into the box.
Who Submits VGM, and When
Responsibility for VGM sits with the shipper of record — the party named on the bill of lading — even when a forwarder or carrier handles the actual submission on their behalf. That responsibility does not transfer to the carrier simply because the container is booked; if the figure is wrong, liability traces back to the shipper.
VGM has to reach the carrier or terminal before a port- and carrier-specific cut-off, which typically falls one to two days ahead of the vessel's stack cut-off and is usually earlier than the cut-off for the underlying booking or customs documents. Because that cut-off is set independently at each port, the same shipper can face different VGM deadlines on two lanes running through different terminals in the same week — one more reason to confirm it per shipment rather than assume it matches the last one.
What Happens If VGM Is Missing or Wrong
A missing VGM keeps a container off the vessel — full stop. There is no standard grace period once the terminal's cut-off passes, and re-booking onto the next available sailing means absorbing whatever transit delay and storage exposure comes with the wait.
A VGM that is submitted but materially inaccurate carries its own risk. Terminals and carriers can flag containers for spot-check re-weighing, and a significant discrepancy between the declared and actual weight can trigger a hold, a re-weigh fee, or in some jurisdictions a fine tied to cargo-weight misdeclaration rules. Because VGM underpins vessel stow planning, carriers treat a wrong number as a safety issue, not a clerical one — so it gets enforced more strictly than most other quote-adjacent line items.
VGM on FCL vs LCL
VGM works differently depending on how your cargo moves. On FCL shipments, you control the full container, so you (or your packing facility) are the party generating the VGM directly — one weighing or calculation, one submission, tied to your booking.
On LCL shipments, your freight shares a container with other shippers' cargo, so the consolidator or CFS (container freight station) operator is the one who produces the VGM for the combined box after all the individual shipments are loaded in — you are not typically weighing or submitting anything yourself. That is one of the operational trade-offs of LCL: less compliance burden per shipper, but less direct visibility into exactly how the final consolidated weight was arrived at.
How to Keep VGM From Becoming a Delay
Three habits keep VGM off the list of things that go wrong on a booking:
- Confirm the method before packing. Decide upfront whether you'll weigh the full container (Method 1) or sum component weights plus tare (Method 2), so the right process — a weighbridge slot or a documented weight log — is in place before cargo ships, not scrambled together at the last minute.
- Treat the VGM cut-off as earlier than your booking cut-off. Because it typically falls ahead of the vessel's stack cut-off, submitting VGM at the same time as the rest of your shipping documents is often too late.
- Keep tare weights current. If you reuse container data from a prior booking under Method 2, confirm the tare weight matches the actual container assigned to this shipment — tare weight varies by container and a stale figure produces a wrong total.
The how shipping works guide walks through where VGM sits in the wider booking timeline alongside customs and carrier cut-offs, and the free cargo calculator is a fast way to compute total gross weight from carton or pallet dimensions before you commit to a packing plan.
Where VGM Fits Into a Quote
VGM shows up as its own line in a standard ocean freight quote alongside OFR, BAF, and THC — a small, flat administrative or weighing fee rather than a rate that moves with market conditions. It is easy to treat as boilerplate because the dollar figure is minor, but the compliance obligation behind it is not: it is the one line on the quote that can independently stop a container from loading if it is missing when the terminal checks.
At Holo Cargo, every FCL booking carries its VGM cut-off as a tracked milestone, not a line buried in a document pack — so you see it coming with enough runway to submit on time instead of finding out at the terminal that a sailing was missed over a number that should have been routine.
