![]() By turn, this makes a stone equivalent to 6.35029kg. Although sanctioned by the EU for use as a supplementary unit it is essentially obsolete outside the UK and Ireland.Ī stone is a unit of weight equal to 14 pounds averdupois (or international lbs). ![]() The stone is a unit of weight in the imperial system used informally in the UK and Ireland, almost exclusively as a measure of body weight. The stone has not been officially recognised as a unit of weight in the UK since 1985. The stone is now used almost exclusively in the UK and Ireland, as a popular – if informal – way of expressing a person’s weight.12 st 6 lbs) instead of purely in pounds as would be the case in the United States (174 lbs). A British or Irish person will commonly express their weight in stone and pounds (eg.The stone is still habitually used to express human bodyweight in some sports in the UK and Ireland, such as boxing and wrestling.The stone is also used in horse racing to describe the weight that a horse has to carry (not necessarily just the jockey, this weight can also include penalties and suchlike).Pound to Stone (US) Conversion Table Pound ġ5 lbs = 15 × 0.08 stone (US) = 1. Most other countries measure body weight in kilograms, and in some cases, in pounds. In 1350, the stone was standardized to be used for wool at a weight of 14 pounds, and in 1835, the United Kingdom adopted this definition for use in the imperial system.Ĭurrent use: The stone as a unit of mass is used mostly in the United Kingdom for measuring body weight. In England, the stone had multiple definitions throughout history, based on the commodity and on local standards. Standardized stones were historically used for trade in England as well as some countries in northern Europe. History/origin: The name "stone" is derived from the use of stones as weights since antiquity. It is defined as 14 pounds or 6.35029318 kilograms. ![]() Stoneĭefinition: A stone (symbol: st) is an English and imperial unit of mass. The UK also often uses both pounds and stones when describing body weight, where a stone is comprised of 14 pounds. Many versions of the pound existed in the past in the United Kingdom (UK), and although the UK largely uses the International System of Units, pounds are still used within certain contexts, such as labelling of packaged foods (by law the metric values must also be displayed). This convenience could be the reason that the system was more popular than other systems of the time that used 10, 12, or 15 subdivisions.Ĭurrent use: The pound as a unit of weight is widely used in the United States, often for measuring body weight. ![]() This prototype weight could be divided into 16 ounces, a number that had three even divisors (8, 4, 2). It is a system that was based on a physical standardized pound that used a prototype weight. It was updated to its current form in 1959. The avoirdupois system is a system that was commonly used in the 13 th century. History/origin: The pound descended from the Roman libra, and numerous different definitions of the pound were used throughout history prior to the international avoirdupois pound that is widely used today. The avoirdupois pound is equivalent to 16 avoirdupois ounces. The international avoirdupois pound (the common pound used today) is defined as exactly 0.45359237 kilograms. Definition: A pound (symbol: lb) is a unit of mass used in the imperial and US customary systems of measurement.
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