Kilograms to stone
Multiply kilograms by 0.157473 to get stone.
80 kg = 12.5978 st
How to convert kilograms to stone
The stone is exactly 14 pounds — the imperial unit defined in Schedule 1 of the UK Weights and Measures Act 1985, so 1 st = 6.35029318 kg exactly. The kilogram is the SI base unit of mass, fixed since 2019 by defining the Planck constant as exactly 6.62607015×10⁻³⁴ J·s.
Worked example — 80 kg: 80 × 0.157473 = 12.5978 st. (12 st 8.4 lb)
Kilograms to stone table
| Kilograms | Stone | Stone and lb |
|---|---|---|
| 50 kg | 7.8737 st | 7 st 12.2 lb |
| 60 kg | 9.4484 st | 9 st 6.3 lb |
| 70 kg | 11.0231 st | 11 st 0.3 lb |
| 75 kg | 11.8105 st | 11 st 11.3 lb |
| 80 kg | 12.5978 st | 12 st 8.4 lb |
| 90 kg | 14.1726 st | 14 st 2.4 lb |
| 100 kg | 15.7473 st | 15 st 10.5 lb |
| 110 kg | 17.322 st | 17 st 4.5 lb |
| 120 kg | 18.8968 st | 18 st 12.6 lb |
Reverse and related
About kilograms and stone
Kilogram (kg)
1 kg = 0.157473 stDefinition. The SI base unit of mass, fixed since 2019 by defining the Planck constant as exactly 6.62607015×10⁻³⁴ J·s
History and origin
The kilogram began in 1795 as the mass of one litre of water at the melting point of ice, and from 1889 was embodied in a platinum-iridium cylinder kept near Paris, the International Prototype Kilogram. In 2019 the SI retired that physical artefact and redefined the unit through a fixed value of the Planck constant, leaving its size unchanged.
Current use
It is the base unit of mass almost everywhere on Earth. The main everyday exception is the United States, where people weigh in pounds even though US science, medicine and industry work in kilograms.
Source: BIPM, The International System of Units (SI), 9th ed. (2019)
Stone (st)
1 st = 6.3503 kgDefinition. Exactly 14 pounds — the imperial unit defined in Schedule 1 of the UK Weights and Measures Act 1985, so 1 st = 6.35029318 kg exactly
History and origin
The stone was a trading weight that varied by commodity and region across medieval Europe before Britain fixed it at 14 pounds. It is defined in Schedule 1 of the UK Weights and Measures Act 1985.
Current use
The stone is still the usual way to give body weight in the United Kingdom and Ireland, where a person might be eleven stone four, but it is little used elsewhere.
Source: Weights and Measures Act 1985 (UK), Schedule 1, Part VI
Where people use this
Kilograms: body weight outside the US, groceries and produce, checked-luggage limits. Stone: body weight in the UK and Ireland. 70 kg is about 11 st 0 lb.
Every value is carried to full double precision; the display is rounded.
Sources: Weights and Measures Act 1985 (UK), Schedule 1, Part VI; BIPM, The International System of Units (SI), 9th ed. (2019).
Questions people ask
How many stone is 70 kg?
70 kg is about 11 stone 0 lb (11.02 stone). To convert kg to stone, multiply by 0.1575.
What is 80 kg in stone?
80 kg is about 12 st 8 lb (12.6 stone), and 90 kg is about 14 st 2 lb.
How do you convert kg to stone?
Multiply the kilograms by 0.1575, or divide by 6.35. A 60 kg person is about 9 st 6 lb.