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Gross register tonnage (abbreviated variously as GRT, grt, g.r.t. and so forth) represents the total internal volume
Volume

The volume of any solid, liquid, plasma, vacuum or theoretical object is how much three-dimensional space it occupies, often quantified numerically....
 of a vessel, with some exemptions for non-productive spaces. A gross register ton is equal to a volume of 100 cubic feet
Cubic foot

The cubic foot is an Imperial unit and United States customary units unit of volume, used in the United States, Canada and the United Kingdom. It is defined as the volume of a cube with sides of one foot in length.|-...
 (~2.83 m³
Cubic metre

The cubic metre is the SI derived unit of volume. It is the volume of a cube with edges one metre in length. An alternative name, which allowed a different usage with SI prefix, was the st?re....
). 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
Gross tonnage

Gross tonnage is a unitless index related to a ship's overall internal volume. Gross Tonnage is different from Gross Register Tonnage. Neither Gross Tonnage nor Gross Register Tonnage are measures of the ship's displacement and should not be confused with terms such as deadweight tonnage, net tonnage, or Displacement ....
, deadweight tonnage
Deadweight tonnage

Deadweight tonnage is a measure of how much mass or weight of cargo or burden a ship can safely carry. Deadweight tonnage was historically expressed in long tons but is now largely replaced internationally by tonnes....
, net tonnage
Net tonnage

Net tonnage is a calculated representation of a the internal volume of a ship's cargo holds. It is expressed in "tonnage", which are units of volume defined as 100 cubic feet ....
, or displacement
Displacement

Displacement may refer to:...
.

This 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 bale
Bale

Bale can refer to any of the following:...
s (exempting the dead space between the ship's ribs).






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Gross register tonnage (abbreviated variously as GRT, grt, g.r.t. and so forth) represents the total internal volume
Volume

The volume of any solid, liquid, plasma, vacuum or theoretical object is how much three-dimensional space it occupies, often quantified numerically....
 of a vessel, with some exemptions for non-productive spaces. A gross register ton is equal to a volume of 100 cubic feet
Cubic foot

The cubic foot is an Imperial unit and United States customary units unit of volume, used in the United States, Canada and the United Kingdom. It is defined as the volume of a cube with sides of one foot in length.|-...
 (~2.83 m³
Cubic metre

The cubic metre is the SI derived unit of volume. It is the volume of a cube with edges one metre in length. An alternative name, which allowed a different usage with SI prefix, was the st?re....
). 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
Gross tonnage

Gross tonnage is a unitless index related to a ship's overall internal volume. Gross Tonnage is different from Gross Register Tonnage. Neither Gross Tonnage nor Gross Register Tonnage are measures of the ship's displacement and should not be confused with terms such as deadweight tonnage, net tonnage, or Displacement ....
, deadweight tonnage
Deadweight tonnage

Deadweight tonnage is a measure of how much mass or weight of cargo or burden a ship can safely carry. Deadweight tonnage was historically expressed in long tons but is now largely replaced internationally by tonnes....
, net tonnage
Net tonnage

Net tonnage is a calculated representation of a the internal volume of a ship's cargo holds. It is expressed in "tonnage", which are units of volume defined as 100 cubic feet ....
, or displacement
Displacement

Displacement may refer to:...
.

This 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 bale
Bale

Bale can refer to any of the following:...
s (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 a widely used term in the industry.

Tonnage measurements are now governed by an IMO Convention (International Convention on Tonnage Measurement of Ships, 1969 (London-Rules)), which applies to all ships built after July 1982. In accordance with the Convention, gross tonnage
Gross tonnage

Gross tonnage is a unitless index related to a ship's overall internal volume. Gross Tonnage is different from Gross Register Tonnage. Neither Gross Tonnage nor Gross Register Tonnage are measures of the ship's displacement and should not be confused with terms such as deadweight tonnage, net tonnage, or Displacement ....
 should be used in day to day 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.

See also

  • Tonnage
    Tonnage

    Tonnage is a measure of the size or cargo capacity of a ship. The term derives from the taxation paid on tuns of wine, and was later used in reference to the weight of a ship's cargo; however, in modern maritime usage, "tonnage" specifically refers to a calculation of the volume or cargo volume of a ship....
  • Gross tonnage
    Gross tonnage

    Gross tonnage is a unitless index related to a ship's overall internal volume. Gross Tonnage is different from Gross Register Tonnage. Neither Gross Tonnage nor Gross Register Tonnage are measures of the ship's displacement and should not be confused with terms such as deadweight tonnage, net tonnage, or Displacement ....
  • Ton
    Ton

    Units of massThere are several similar units of mass or volume called the ton:Others*The long ton is used for petroleum products such as aviation fuel....
  • Stability conditions (watercraft)
    Stability conditions (watercraft)

    Stability conditions is the term used to describe the various standard loading configurations to which a ship, boat, or offshore platform may be subjected....


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