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Net register tonnage

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Net register tonnage

Net register tonnage (NRT, nrt, n.r.t.) is a ship's cargo volume capacity expressed in "register tons", one of which equals to a volume of 100 cubic feet (2.83 m3). It is calculated by subtracting non-revenue-earning spaces i.e. spaces not available for carrying cargo, for example engine rooms, fuel tanks and crew quarters, from the ship's gross register tonnage.[1][2] Net register tonnage is not a measure of the weight of the ship or its cargo, and should not be confused with terms such as deadweight tonnage or displacement.

Gross and net register tonnages were replaced by dimensionless indices calculated from the total moulded volume of the ship and its cargo spaces by mathematical formulae, have been the only official measures of the ship's tonnage.[3] However, the gross and net register tonnages are still widely used in describing older ships.

References

  1. ^
  2. ^ Units and Systems of Measurement Their Origin, Development, and Present Status. National Institute of Standards and Technology. Retrieved 2011-10-17.
  3. ^ International Convention on Tonnage Measurement of Ships. International Maritime Organization (IMO). Retrieved 2011-10-17.
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