*'''Ton metrik''' (M/T), dalam bahasa Indonesia sering disebut dengan '''Tonton''' saja, adalah satuan [[massa]] yang sama dengan 1000 [[kilogram]]. Satu ton sama dengan sepuluh '''kuintal'''.
*'''Ton pendek''' (S/T), atau sering disebut dengan '''Tonton Amerika Serikat''', adalah satuan [[massa]] yang sama dengan {{convert|2000|lb|kg|abbr=off|order=flip}}.<ref name=BTS.GOV>{{cite web |url=http://ntl.bts.gov/DOCS/narmain/narmain.html |title=Naval Architecture for All |publisher=United States Bureau of Transportation Statistics |accessdate=October 13, 2008 |url-status=live |archiveurl=https://web.archive.org/web/20081010071508/http://ntl.bts.gov/DOCS/narmain/narmain.html |archivedate=October 10, 2008 }}. "Historically, a very important and standard cargo for European sailing vessels was wine, stored and shipped in casks called tuns. These tuns of wine, because of their uniform size and their universal demand, became a standard by which a ship's capacity could be measured. A tun of wine weighed approximately 2,240 pounds, and occupied nearly 60 cubic feet." ([[Thomas C. Gillmer|Gillmer, Thomas]] (1975). ''Modern Ship Design''. United States Naval Institute.) "Today the ship designers standard of weight is the long ton which is equal to 2,240 pounds." This is the weight of 35 cubic feet of Sea Water at a specific gravity of 1.025, compared to Fresh Water, specific gravity of 1.000 usually measured at 60 degrees F. Handy numbers: 35, 36, 37, number of Cubic Feet per Salt Water, Fresh Water and Lube Oil.</ref>
*'''Ton panjang''' (L/T), atau sering disebut dengan '''Tonton Britania''' atau '''Tonton Imperial''', adalah satuan [[massa]] yang sama dengan {{convert|2240|lb|kg|abbr=off|order=flip}}.{{efn|The "pound" used in this article is the [[avoirdupois pound]]. Its mass [[International yard and pound|is defined]] as exactly 0.45359237 kg }}<ref>{{cite web| url = http://www.opsi.gov.uk/acts/acts1985/pdf/ukpga_19850072_en.pdf| title = Weights and Measures Act 1985| accessdate = 2010-02-03| date = 1985-10-30| publisher = Her Majesty's Stationery Office| url-status = live| archiveurl = https://web.archive.org/web/20091208083258/http://www.opsi.gov.uk/acts/acts1985/pdf/ukpga_19850072_en.pdf| archivedate = 2009-12-08}}</ref>
