Gross register tonnage

Gross register tonnage (GRT, grt, g.r.t., gt), or gross registered tonnage, is a ship's total internal volume expressed in "register tons", each of which is equal to 100 cubic feet (2.83 m³). Replaced by Gross Tonnage (GT), gross register tonnage uses the total permanently enclosed capacity of the vessel as its basis for volume. Typically this is used for dockage fees, canal transit fees, and similar purposes where it is appropriate to charge based on the size of the entire vessel. Internationally, GRT may be abbreviated as BRT for the German "Bruttoregistertonne".

Net register tonnage subtracts the volume of spaces not available for carrying cargo, such as engine rooms, fuel tanks and crew quarters, from gross register tonnage.^[1]^[2]

Gross register tonnage is not a measure of the ship's weight or displacement and should not be confused with terms such as deadweight tonnage or displacement.

^ Stopford, Martin (2009), Maritime Economics, Taylor & Francis, p. 752, ISBN 9780415275576, retrieved 2011-10-17
^ "Units and Systems of Measurement Their Origin, Development, and Present Status" (PDF). National Institute of Standards and Technology. Archived from the original (PDF) on 19 October 2011. Retrieved 17 October 2011.

[stopford-1] Stopford, Martin (2009), Maritime Economics, Taylor & Francis, p. 752, ISBN 9780415275576, retrieved 2011-10-17

[tsnistgov-2] "Units and Systems of Measurement Their Origin, Development, and Present Status" (PDF). National Institute of Standards and Technology. Archived from the original (PDF) on 19 October 2011. Retrieved 17 October 2011.

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