Tonnage

Tonnage refers to the size or cargo-carrying capacity of a ship. The term originates from the "tun," a large cask that was used to measure the capacity of a ship in terms of how many tuns of wine it could carry.

Gross Tonnage is the volume of all enclosed spaces on a ship . This includes the Engine Room and other non- cargo spaces as well. The tonnage is calculated by a complex formula that is not within this article’s scope. Most Maritime Regulations (SOLAS, MARPOL etc.) apply to ships based on their Gross Tonnage.

Net Tonnage, on the other hand, is the volume of only the cargo carrying spaces on the ship. This is the tonnage that determines the earning capability of the vessel. Most port/anchorage dues apply to ships based on their Net Tonnage.

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