The exact equivalent
A stone is exactly 14 pounds, which is 6.35029 kilograms. It survives almost exclusively for body weight.
1 st = 6.35029318 kg
1 kg = 0.15747304 st
How to convert it by hand
Just multiply by the conversion factor. To go from stone to kilograms, multiply by 6.350293; to come back, divide by that same number or multiply by 0.157473.
For example: 25 st × 6.350293 = 158.7573 kg.
A tip that saves mistakes: check the result goes the way you expect. If kilograms are a smaller unit than stone, the number has to come out bigger. If it comes out smaller, you divided when you should have multiplied.
Conversion table
| st | kg |
|---|---|
| 1 | 6.3503 |
| 2 | 12.7006 |
| 5 | 31.7515 |
| 10 | 63.5029 |
| 20 | 127.0059 |
| 50 | 317.5147 |
| 100 | 635.0293 |
Reference points to picture it
| Reference | Equals |
|---|---|
| 8 stone | 50.8 kg |
| 11 stone | 69.9 kg |
| 14 stone | 88.9 kg |
| 1 stone | 6.35 kg |
The trick for doing it in your head
Multiply by 6 and add 6%. For 11 stone: 66 plus 4 gives about 70 kg, against a true 69.85.
It is fine for getting by without a phone, but not for anything that depends on precision: in a recipe, on a building site or in a dose, use the exact conversion.