Stone to Kilograms Converter
Convert stone to kilograms instantly. 1 stone = 6.35029 kg. Formula, table and how boxing weight classes bridge both systems.
Written by Rahman · Last reviewed
Quick answer
One stone equals 6.35029 kilograms. Multiply stone by 6.35029 to get kilograms, so 11 stone is about 69.9 kg.
| Kilogram (kg) | 6.35029318 |
| Gram (g) | 6350.29318 |
| Milligram (mg) | 6350293.18 |
| Microgram (µg) | 6350293180 |
| Tonne (metric) (t) | 0.00635029318 |
| Pound (lb) | 14 |
| Ounce (oz) | 224 |
| Stone (st) | 1 |
| Carat (ct) | 31751.4659 |
| US ton (short) (ton) | 0.007 |
| Long ton (UK) (long ton) | 0.00625 |
st to kg conversion table
| st | kg |
|---|---|
| 1 st | 6.35029318 kg |
| 2 st | 12.70058636 kg |
| 3 st | 19.05087954 kg |
| 4 st | 25.40117272 kg |
| 5 st | 31.7514659 kg |
| 6 st | 38.10175908 kg |
| 7 st | 44.45205226 kg |
| 8 st | 50.80234544 kg |
| 9 st | 57.15263862 kg |
| 10 st | 63.5029318 kg |
| 20 st | 127.0058636 kg |
| 30 st | 190.5087954 kg |
| 40 st | 254.0117272 kg |
| 50 st | 317.514659 kg |
| 60 st | 381.0175908 kg |
| 70 st | 444.5205226 kg |
| 80 st | 508.0234544 kg |
| 90 st | 571.5263862 kg |
| 100 st | 635.029318 kg |
| 250 st | 1587.573295 kg |
| 500 st | 3175.14659 kg |
| 1000 st | 6350.29318 kg |
How to convert st to kg
Historically, British and Irish boxing and wrestling weight classes were set in stone (and pounds within a stone): "welterweight" and similar categories predate the metric system entirely, while modern international federations now publish the same limits in kilograms, so older UK sports records and current international ones sit side by side in two different units for the same class.
A stone is 14 pounds by definition, which is why converting stone to kilograms is really a two-step conversion in disguise: stone to pounds (× 14), then pounds to kilograms (× 0.453592), and the single figure 6.35029 is just those two steps pre-multiplied. Jockeys in British and Irish horse racing are still weighed in stone and pounds, one of the last professional contexts where the unit carries real regulatory weight rather than just casual use.