Long ton

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 Kingdom and several other Commonwealth countries. It has been mostly replaced by the tonne, and in the USA by the short ton. It is equal to 2,240 pounds (1,016 kg) or 35 cubic feet (0.99 m³) 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 1,000 kg or 2,205 lb. The standard ton in the U.S. measurement system is the "short ton", equal to 2,000 pounds (907.18474 kg). Both long and short tons are defined as 20 hundredweights, but a hundredweight is 112 pounds (50.8 kg) in the Imperial system (long or gross hundredweight) and 100 pounds (45.4 kg) in the U.S. system (short or net hundredweight).

See also

• Short ton, 2,000 lb (907 kg).
• Tonnage, volume measurement used in maritime shipping. Originally based on 100 cubic feet (2.83 m³) .
• Tonne, also known as a metric ton (t). 1,000 kg (2,205 lb).