VGM: distinguish the packed container from cargo weight

Overview

IMO describes VGM as the verified gross mass of the packed container. Verification is by weighing the packed container or an approved component-summing method including cargo, packing/securing material and container tare. The shipper has the applicable information responsibilities.

Cargo gross weight is not automatically VGM

Packing-list gross weight may omit container tare and securing material. GENLOG recommends separate cargo-weight and VGM fields. Applicable weighing and approval requirements still matter; an internal calculation is not automatically a certified method.

Cargo weight and VGM are different

VGM is the verified gross mass of the packed container under applicable requirements. A planning calculation is not automatically a valid verification. Establish the responsible shipper, accepted method at the place of packing and submission route to the carrier or terminal.

Verification and submission workflow

1. Identify container, equipment and its tare; confirm the responsible shipper and authorised signatory.
2. Select weighing of the packed container or an approved component-summing method under the competent authority’s applicable requirements.
3. Check weighing equipment, method records and kg/tonne units. Estimates cannot replace verification.
4. Compare mass with equipment, payload and applicable transport limits. Filing VGM does not prove the shipment meets every loading limit.
5. Submit against the correct booking and container before the deadline. Keep the source, supplier, time and acceptance record.
6. Reassess verification after cargo or container changes. Update all recipients so conflicting values do not remain active.

A reconciliation example, not a certificate

Assume goods and packaging weigh 10,000 kg, additional securing materials 150 kg and container tare 2,200 kg. The arithmetic total is 12,350 kg. Do not add pallets again if already included in the first figure. In tonnes the result is 12.35; verify the portal’s units and decimal convention.

This example helps detect errors. It becomes usable VGM only when the method, data and authorisation meet applicable requirements. Investigate significant differences from actual weighing by checking tare, units, materials and actual cargo. Do not change a scale result merely to match the packing list.

Common questions

• Does VGM guarantee loading? No; cargo acceptance, terminal deadlines and operating plans still matter.
• Is packing-list gross weight VGM? Usually it describes packed cargo, not the entire packed container.
• Is every summing procedure acceptable? Method two must meet approval and local requirements at the place of packing.
• What if the units were wrong? Use the official correction channel promptly, obtain replacement acceptance and reconcile affected records.

Evidence checklist

Link the container number to weighing evidence. Check units, authorized details, submission channel and the booking’s current VGM deadline. Retain acknowledgement. Reassess the data if cargo, materials or container change after weighing.

References

GENLOG practical guide, reviewed on 24 October 2026 using public primary sources. Examples are illustrations, not official tariffs or contract templates.

Next guide

SI, VGM and CY cut-offs: manage three separate deadlines