Long ton
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A long ton (sometimes known as a gross ton or weight ton) is the name used in the US for the unit called the "ton" in the avoirdupois or Imperial system of measurements, as used (alongside the metric system) in the United Kingdom and several other Commonwealth countries. It is equal to 2240 pounds (exactly 1016.0469088 kilograms). It has some limited use in the US, most commonly in measuring the displacement of ships.
The standard ton in the US measurement system is the "short ton", equal to 2000 pounds (exactly 907.18474 kg). Both long and short tons are defined as 20 hundredweights, but a hundredweight is 112 pounds (which is equal to 8 stone) in the Imperial system (long or gross hundredweight) and 100 pounds in the US system (short or net hundredweight).
The spelling "tonne" denotes the metric tonne of 1000 kilograms (approximately 2204.623 pounds).
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