Stone (unit)

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Stone (abbreviation: st) is a unit of mass that is used in the United Kingdom and Ireland for measuring body weight. One stone is equivalent to 14 pounds or approximately 6.35 kilograms.

History

The stone has been used as a unit of weight for centuries. Its origins can be traced back to the use of stones for weighing various commodities. The exact weight of a stone varied by region and commodity, but the standardized stone of 14 pounds was established in England by the 14th century.

Usage

The stone is primarily used in the UK and Ireland for expressing human body weight. For example, a person might weigh "11 stone 4 pounds" (11 st 4 lb), which is equivalent to 158 pounds or approximately 71.67 kilograms. The use of the stone for other purposes has largely been replaced by the kilogram and pound in most other contexts.

Conversion

To convert stones to pounds, multiply the number of stones by 14. To convert stones to kilograms, multiply the number of stones by 6.35. Conversely, to convert pounds to stones, divide the number of pounds by 14, and to convert kilograms to stones, divide the number of kilograms by 6.35.

Examples

• 1 stone = 14 pounds
• 1 stone = 6.35 kilograms
• 10 stones = 140 pounds
• 10 stones = 63.5 kilograms

Related Units

• Pound (mass)
• Kilogram
• Gram
• Ounce
• Ton

See Also

• Imperial units
• Metric system
• Weight
• Body mass index