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Long ton (weight ton or imperial ton) is the name for the unit called the "ton" in the avoirdupois or Imperial system of measurements, as used in the United Kingdommarker and several other Commonwealth countries. It has been mostly replaced by the tonne, and in the USAmarker by the short ton. It is equal to or of salt water with a density of 1.025 g/ml. It has some limited use in the United States, most commonly in measuring the displacement of ships, and was the unit prescribed for warships by international agreements between the world wars, for example battleships were limited to 35,000 long tons.

The tonne is equal to . The standard ton in the U.S. measurement system is the "short ton", equal to . Both long and short tons are defined as 20 hundredweights, but a hundredweight is in the Imperial system (long or gross hundredweight) and in the U.S. system (short or net hundredweight).

See also

  • Short ton, .
  • Tonnage, volume measurement used in maritime shipping. Originally based on .
  • Tonne, also known as a metric ton (t). .


  1. Glossary

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