# The Merchant Shipping (Tonnage) Regulations 1997, Regulation 7: Net tonnage


The net tonnage (NT) of a ship shall be determined by the following formula—
NT=K2Vc(4d3D)2+K3(N1+N210) where—
Vc total volume of cargo spaces in cubic metres;
K2 0.2 + 0.02 log10 Vc , as specified in Schedule 2.
K3 1.25GT+10,00010,000
GT gross tonnage calculated in accordance with regulation 6;
D moulded depth amidships in metres;
d moulded draught amidships in metres;
N1 number of berths for passengers in cabins with not more than 8 berths; and
N2 number of other passengers who may be accommodated on the ship;
provided that—
(a) the factor—
(4d3D)2 shall not be taken as greater than unity;
(b) the term—
K2Vc(4d3D)2 shall not be taken as less than 0.25 GT;
(c) N1 and N2 shall be taken as zero when N1 + N2 is less than 13; and
(d) NT shall not be taken as less than 0.30 GT.

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Source: https://www.legislation.gov.uk/uksi/1997/1510/regulation/7 (the official version)
Page: https://openlegislation.uk/merchant-shipping-tonnage-regulations-1997/regulation-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.