Stone (st)
The stone (st) is 14 pounds, exactly 6.35029318 kg. It is still used for body weight in the UK and Ireland, often as stones and pounds.
Symbol: st
Quantity: mass (commonly called weight)
SI relation: 1 st = 6.35029318 kg (exact)
Derivation: 1 st = 14 lb = 6.35029318 kg (exact)
Exact: yes, by definition
Reference conditions. Avoirdupois system: 1 lb = 16 oz = 7000 grains = 0.45359237 kg exactly (1959 agreement).
Typical uses
- Body weight in the UK and Ireland (e.g. 11 st 6 lb)
- Older British agricultural trade
Convert stone to other units
| Conversion | 1 st equals | Reverse |
|---|---|---|
| stone to kilogram | 6.35029318 kg | kilogram to stone |
| stone to gram | 6350.29318 g | gram to stone |
| stone to milligram | 6350293.18 mg | milligram to stone |
| stone to pound | 14 lb | pound to stone |
| stone to ounce | 224 oz | ounce to stone |
| stone to microgram | 6350293180 µg | microgram to stone |
| stone to metric ton | 0.00635029318 t | metric ton to stone |
| stone to short ton | 0.007 ton (US) | short ton to stone |
| stone to troy ounce | 204.1666667 oz t | troy ounce to stone |
| stone to long ton | 0.00625 ton (UK) | long ton to stone |
| stone to grain | 98000 gr | grain to stone |
| stone to carat | 31751.4659 ct | carat to stone |
Open the Weight and Mass Converter to convert any value between all units.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, pound (avoirdupois).
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Stone (st). Retrieved October 17, 2026, from https://scientificconverters.com/units/stone/
IEEE
Scientific Converters, "Stone (st)," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/units/stone/