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gross register tonnage wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 history 2 see also 3 references toggle the table of contents gross register tonnage 39 languages العربية български বাংলা čeština dansk deutsch ελληνικά esperanto español eesti suomi français nordfriisk עברית hrvatski magyar bahasa indonesia italiano 日本語 한국어 latina lietuvių македонски bahasa melayu nederlands norsk nynorsk norsk bokmål polski português русский srpskohrvatski српскохрватски simple english slovenčina slovenščina svenska ไทย türkçe українська 中文 edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia volume of a ship in units of 100 cubic feet this article is about a historic measure of a ship s internal volume since superseded not to be confused with deadweight tonnage or displacement ship gross register tonnage grt grt g r t gt or gross registered tonnage is a ship s total internal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 m 3 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 mass weight or displacement and should not be confused with terms such as deadweight tonnage or displacement history edit further information gross tonnage and net tonnage gross register tonnage was defined by the moorsom commission in 1849 gross and net register tonnages were replaced by gross tonnage and net tonnage respectively when the international maritime organization imo adopted the international convention on tonnage measurement of ships on 23 june 1969 the new tonnage regulations entered into force for all new ships on 18 july 1982 but existing vessels were given a migration period of 12 years to ensure that ships were given reasonable economic safeguards since port and other dues are charged according to ship s tonnage since 18 july 1994 the gross and net tonnages 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 see also edit transport portal ton volume tonnage references edit 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 international convention on tonnage measurement of ships archived 2013 12 02 at the wayback machine international maritime organization imo retrieved 2011 10 17 v t e ship measurements length length overall length between perpendiculars length at the waterline breadth beam depth draft moulded depth freeboard load line plimsoll line under keel clearance height air draft volume worldwide tonnage gross tonnage compensated gross tonnage net tonnage underdeck tonnage specialized panama canal universal measurement system thames measurement tonnage archaic gross register tonnage net register tonnage capacity current deadweight tonnage twenty foot equivalent unit intermodal containers archaic builder s old measurement moorsom system weight displacement loaded displacement standard displacement light displacement normal displacement stability inclining test list angle of loll metacentric height gm limits aframax baltimax capesize chinamax handymax supramax handysize malaccamax panamax and neopanamax péniche q max qatar max seawaymax suezmax vlcc and ulcc yamalmax retrieved from https en wikipedia org w index php title gross_register_tonnage oldid 1357587420 categories nautical terminology ship measurements hidden categories articles with short description short description is different from wikidata webarchive template wayback links this page was last edited on 3 june 2026 at 14 21 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents gross register tonnage 39 languages add topic