Long ton (weight ton or Imperial ton) is the name for the unit called the "ton" in the avoirdupois or Imperial system of measurements that was used in the United Kingdom and several other Commonwealth countries before metrication. One long ton is equal to 2,240 pounds (1,016 kg), 1.12 times as much as a short ton and slightly (1.59%) larger than the 1,000 kilograms (2,205 lb) metric tonne, or 35 cubic feet (0.9911 m3) of salt water with a density of 64 lb/cu ft (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 the Washington Naval Treaty 1922—for example battleships were limited to a mass of 35,000 long tons (36,000 t; 39,000 short tons).
The long ton arises from the traditional British measurement system: A long ton is 20 hundredweight, each of which is 8 stone, which is defined as 14 pounds. Thus a long ton is 20 × 8 × 14 lb = 2,240 lb.
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