Stone to kilograms
One stone is 6.35029318 kilograms.
1 stone = 6.35029318 kilograms · 1 kilogram = 0.1574730444 stone
This factor is exact, not rounded. It comes from the definition of the units rather than from a measurement, so the only limit on precision is how many digits are worth showing.
Stone to kilograms table
| Stone (st) | Kilograms (kg) |
|---|---|
| 1 | 6.35029318 |
| 2 | 12.70058636 |
| 3 | 19.05087954 |
| 5 | 31.7514659 |
| 10 | 63.5029318 |
| 20 | 127.0058636 |
| 25 | 158.7573295 |
| 50 | 317.514659 |
| 100 | 635.029318 |
| 500 | 3,175.14659 |
| 1,000 | 6,350.29318 |
How the conversion works
Multiply by 6.35029318 to go from stone to kilograms, or by 0.1574730444 to go back the other way. Both figures are exact rather than rounded: they follow from the definitions of the units, not from anybody measuring something.
The exactness is more interesting than it sounds. Since the International Yard and Pound Agreement of 1959, the inch has been defined as exactly 25.4 millimetres and the pound as exactly 0.45359237 kilograms. Every other imperial length and weight follows from those two by whole-number ratios, which means the imperial system is now defined in terms of the metric one rather than alongside it.
The stone is 14 pounds and survives almost exclusively for body weight in Britain and Ireland, where someone will give their weight as eleven stone four without hesitating and would struggle to say it in pounds.