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The long ton, [1] also known as the imperial ton or displacement ton, [1] [2] is a measurement unit equal to 2,240 pounds (1,016.0 kg). It is the name for the unit called the " ton " in the avoirdupois system of weights or Imperial system of measurements.
Ton is any of several units of measure of mass, volume or force. It has a long history and has acquired several meanings and uses. As a unit of mass, ton can mean: the long ton, which is 2,240 pounds (1,016.0 kilograms) the tonne, also called the metric ton, which is 1,000 kilograms (about 2,204.6 pounds) or 1 megagram.
The short ton (abbreviation tn [1]) is a measurement unit equal to 2,000 pounds (907.18 kg). It is commonly used in the United States, where it is known simply as a ton; [1] however, the term is ambiguous, the single word "ton" being variously used for short, long, and metric tons.
In both systems, 20 hundredweights make a ton. In the US, the terms long ton (2240 lb, 1 016.046 9088 kg) and short ton (2000 lb; 907.184 74 kg) are used. The metric ton is the name used for the tonne (1000 kg, 2 204.622 62 lb), which is about 1.6% less than the long ton.
[6] [7] In the United States, metric ton is the name for this unit used and recommended by NIST; [2] an unqualified mention of a ton typically refers to a short ton of 2,000 lb (907.2 kg) and to a lesser extent to a long ton of 2,240 lb (1,016 kg), with the term tonne rarely used in speech or writing.
The long ton-force is equal to the weight of one long ton. one long ton-force = 2 240 lbf = 1 016.046 9088 kgf = 9.964 016 418 183 52 kN = 1.12 short tons-force [note 7]
Twenty hundredweight equals a ton (as in the US and Canadian [36] systems). The imperial hundredweight is 12% greater than the US and Canadian one. The imperial ton (or long ton) is 2240 pounds, which is much closer to a tonne (about 2 204.6 pounds), compared to the 10.7% smaller North American short ton of 2 000 pounds (907.185 kg ...
In modern maritime usage, "tonnage" specifically refers to a calculation of the volume or cargo volume of a ship. Although tonnage (volume) should not be confused with displacement (the actual mass of the vessel), the long ton (or imperial ton) of 2,240 lb is derived from the fact that a "tun" of wine typically weighed that much.