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During the Middle Ages, a conveniently-sized rock was often chosen as a local standard for weighing agricultural commodities, but the weight of these rocks varied with the commodity and region. By the late Middle Ages, international trade required a fixed standard. In 1389, a royal statute of Edward III fixed the stone of wool at 14 pounds, thus leading to the standard still used today.

Today, the stone (abbreviated as 'st') is a unit of measure equal to 14 pounds avoirdupois (about 6.35kg) used in Great Britain and Ireland for measuring human body weight.

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11y ago

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