Stones to Kilograms Converter
There are exactly 6.35029318 kilograms in one stone. To convert stones to kilograms, multiply by 6.35029318.
How to Convert Stones to Kilograms
To convert stones to kilograms, multiply by 6.35029318.
For example: 5 stones × 6.35029318 = 31.7514659 kilograms.
How Many Kilograms in a Stone?
There are exactly 6.35029318 kilograms in one stone. For everyday use, about 6.35 kilograms.
Where This Comes Up
Stones are British and kilograms are everywhere else, so this conversion comes up whenever a UK weight has to go into a medical record, a dosing calculation or a fitness app set to metric.
10 stone is 63.5029 kilograms, the weight a metric scale would show for a British 10-stone reading.
What People Get Wrong
Converting "9 stone 12" by treating it as 9.12 stone gives 57.9 kg instead of the correct 62.6 kg — a 5-kilogram error. Convert the loose pounds separately.
Stones to Kilograms Conversion Table
| Stones (st) | Kilograms (kg) |
|---|---|
| 1 | 6.35029318 |
| 2 | 12.7006 |
| 3 | 19.0509 |
| 4 | 25.4012 |
| 5 | 31.7514659 |
| 6 | 38.1018 |
| 7 | 44.4521 |
| 8 | 50.8023 |
| 9 | 57.1526 |
| 10 | 63.5029318 |
| 11 | 69.8532 |
| 12 | 76.2035 |
| 13 | 82.5538 |
| 14 | 88.9041 |
| 15 | 95.2543977 |
| 16 | 101.605 |
| 17 | 107.955 |
| 18 | 114.305 |
| 19 | 120.656 |
| 20 | 127.006 |
| 25 | 158.757 |
| 30 | 190.509 |
| 40 | 254.012 |
| 50 | 317.514659 |
| 75 | 476.272 |
| 100 | 635.029318 |
| 250 | 1,587.57 |
| 500 | 3,175.14659 |
| 1,000 | 6,350.29318 |
About These Units
The stone
A stone is 14 pounds, or about 6.35 kilograms. It is still the normal way to state body weight in the United Kingdom and Ireland, but it is not used in the United States.
The kilogram
The kilogram is the SI base unit of mass, redefined in 2019 in terms of the Planck constant. The pound is now legally defined as exactly 0.45359237 kilograms.
Definitions follow NIST Special Publication 811, Appendix B. See how we calculate for the exact values and rounding rules.
Frequently Asked Questions
How many kg is 1 stone?
One stone is 6.35029318 kilograms, since a stone is 14 pounds and a pound is exactly 0.45359237 kg.
How many kilograms is 11 stone?
11 stone is 69.8532 kilograms.
What is the quick estimate?
Multiply by 6 and add 6 percent, or just multiply by 6.35. For 12 stone that gives about 76.2 kg.
How do I convert stones and pounds together?
Turn everything into pounds first, then multiply by 0.45359237. For 11 stone 4 that is 158 pounds, or 71.6676 kg.