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Gross Register Tonnage

Gross register tonnage (GRT, grt, g.r.t.) represents the total internal volume of a vessel, with some exemptions for non-productive spaces.[1] A gross register ton is equal to a volume of 100 cubic feet (~2.83 m³). Gross register tonnage is not a measure of the ship's weight or displacement and should not be confused with terms such as gross tonnage, deadweight tonnage, net tonnage, or displacement.

Calculation of gross register tonnage is complex; a hold can, for instance, be assessed for grain (accounting for all the air space in the hold) or for bales (exempting the dead space between the ship's ribs). Also, certain non-productive spaces, such as crew's quarters, are exempted from the calculation.

Gross register tonnage was replaced by gross tonnage in 1994 under the Tonnage Measurement convention of 1969, but is still widely used in the industry.

Tonnage measurements are governed by an IMO Convention (International Convention on Tonnage Measurement of Ships, 1969 (London-Rules)), which applies to ships built after July 1982. In accordance with the Convention, gross tonnage should be used in business instead of gross register tonnage. Gross register tonnage is a function of the all the moulded volume of all enclosed spaces of the ship.

容积总吨　　

又称注册总吨，是指船舱内及甲板上所有关闭的场所的内部空间（或体积）的总和，是以100立方英尺或2.83立方米为一吨折合所得的商数。 容积总吨的用途很广，它可以用于国家对商船队的统计；表明船舶的大小；用于船舶登记；用于政府确定对航运业的补贴或造舰津贴：用于计算保险费用、造船费用以及船舶的赔偿等。