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The net tonnage calculation is based on a number of factors, one of which is the moulded draft d.The choice of the value to use for d can be complicated. For ships subject to the International Convention on Load Lines, the Summer Load Line draft is used, with the exception of cases where that is a timber load line.
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 m 3).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.
Net register tonnage (NRT) is the volume of cargo the vessel can carry—that is, the gross register tonnage less the volume of spaces that do not hold cargo (e.g., engine compartment, helm station, and crew spaces, again with differences depending on which port or country does the calculations).
GT replaced Gross register tonnage (GRT), which is now an obsolete unit. Net tonnage – NT – Not expressible in units of mass or weight but is based on the cargo volume of the vessel in cubic meter with a formula applied. NT replaced Net register tonnage (NRT) which is now an obsolete unit.
Gross tonnage, along with net tonnage, was defined by the International Convention on Tonnage Measurement of Ships, 1969, adopted by the International Maritime Organization (IMO) in 1969, and came into force on 18 July 1982. These two measurements replaced gross register tonnage (GRT) and net register tonnage (NRT). Gross tonnage is calculated ...
Net tonnage is a dimensionless index calculated with a mathematical formula. While this template allows, for the sake of backwards compatibility, the use of "tons" as the unit for net tonnage, this is not correct and should not be used in future articles.
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A tonnage tax is a taxation mechanism that can be applied to shipping companies instead of ordinary corporate taxation. The tax is determined by the net tonnage of the entire fleet of vessels under operation or use by a company. It is on the basis of this variable that taxation is applied.