Stone (st) - Unit Information & Conversion
What is a Stone?
Definition
The stone (st) is a unit of mass in the British imperial system, defined as exactly 14 avoirdupois pounds. This is equivalent to approximately 6.35 kilograms.
History
The stone has historical roots in trade, where actual stones were used as weights. Its value varied significantly by commodity and region before being standardized at 14 pounds in Britain for general purposes.
Common Uses
- Body Weight: Primarily used in the UK and Ireland to express human body weight.
- Animal Weighing: Occasionally used informally for weighing large animals or agricultural produce in some Commonwealth countries.
- Historical Usage: Largely historical or colloquial use outside of body weight context.
Unit FAQs
How many pounds are in a stone?
There are 14 pounds (lb) in 1 stone (st).
Is the stone used outside the UK and Ireland?
Its use is very limited outside the UK and Ireland, mainly for historical context or by people familiar with imperial body weight measurements.
Why is it called a stone?
The name originates from the historical practice of using stones of a standardized size as weight standards in trade.
Stone Conversion Formulas
To Kilogram:
To Gram:
To Milligram:
To Pound:
To Ounce:
To Ton (metric):
To Ton (US):
To Ton (UK):
To Microgram:
To Carat:
To Slug:
To Troy Ounce:
To Pennyweight:
To Grain:
To Dram:
To Quintal:
To Atomic Mass Unit:
To Pavan (India):
To Kati (India):
To Masha (India):
To Dina (India):
To Pras (India):
To Lota (India):
Convert Stone
Need to convert Stone to other weight units? Use our conversion tool.