Stone to Kg Converter
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Convert stone to kilograms (and back) instantly. UK stone = 14 lb = 6.35029318 kg — everyday UK body-weight unit. Ireland uses the same stone for people; the US rarely does.
Stone
st
Kilograms
kg
1 st = 6.3503 kg
Convert Stone
Quick presets
Kilograms
69.8532 kg
11 st = 69.8532 kg
- 8 st
- 50.8023 kg
- 9 st
- 57.1526 kg
- 10 st
- 63.5029 kg
- 11 st
- 69.8532 kg
- 12 st
- 76.2035 kg
- 13 st
- 82.5538 kg
- 15 st
- 95.2544 kg
- 20 st
- 127.01 kg
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Stone vs kilograms
A stone is the everyday UK (and Irish) unit for talking about body weight: one stone equals 14 pounds. Kilograms are what medical charts, gym trackers, and most international forms expect. The conversion is exact: 1 stone = 6.35029318 kg (because 14 lb × the pound-to-kilogram factor).
Worked example: 12 stone is 12 × 14 = 168 lb, which is about 76.2 kg. A scale reading of “11 st 4 lb” means (11 × 14) + 4 = 158 lb — convert the full weight to kg rather than treating the “11” as kilograms.
Caveat: the US almost never uses stone for people, and older trade “stones” for commodities can differ. This calculator uses the UK stone of 14 avoirdupois pounds only. For telehealth or travel forms, know both units so you do not enter stone as if it were kg.
Round-trip sanity check: 10 st = 140 lb = 63.5029 kg; divide kg by 6.35029318 to get stone back. UK scales showing “10 st 0 lb” are not 10 kg — never enter stone digits into a kg-only health app.
Common questions
How do I read UK bathroom scales that show stone and pounds?
UK scales often display like “11 st 4 lb” — 11 stone plus 4 extra pounds. One stone equals 14 lb. Convert the full weight: (11 × 14) + 4 = 158 lb, then to kg if needed. Round-trip: 11 st → 69.85 kg via 154 lb.
Why do UK doctors sometimes ask for weight in stone?
Public conversation in the UK and Ireland still uses stone for body weight, while medical notes may record kilograms. Know both if you are filling international health forms or telehealth intake. Round-trip: 11 st → 69.85 kg.
Is a stone the same in the US?
The US rarely uses stone for people. A “stone” in US trade can refer to other customary weights (e.g. 14 lb for some commodities). This calculator uses the UK stone of 14 avoirdupois pounds.
How many kg is 12 stone?
12 stone is 168 lb, which is about 76.2 kg. For gym or nutrition tracking in kg, convert the total rather than treating “12” as a kg value. Round-trip: 76.2 kg ÷ 6.35029318 ≈ 12 st exactly.