Convert stones to kilograms instantly. Enter a value below, or use the formula and reference table further down the page.
In practice
Stones to kilograms is the conversion for UK and Irish body weights, where people still say they weigh 11 stone 4. One stone is exactly 14 pounds, or 6.35029 kg, so 10 stone is 63.5 kg and 12 stone is 76.2 kg. If a weight comes as stones and pounds, convert the stones, then convert the extra pounds (each 0.4536 kg) and add them together. The stone is not used in the US, and medical charts internationally use kilograms, which is why health apps often ask you to switch.
How to convert stones to kilograms
Multiply the value by 6.35029318.
kg = st × 6.35029318Example: 10 st = 63.5029 kg.
Stones to Kilograms conversion table
| Stones (st) | Kilograms (kg) |
|---|---|
| 1 st | 6.3503 kg |
| 2 st | 12.7006 kg |
| 3 st | 19.0509 kg |
| 4 st | 25.4012 kg |
| 5 st | 31.7515 kg |
| 10 st | 63.5029 kg |
| 15 st | 95.2544 kg |
| 20 st | 127.0059 kg |
| 25 st | 158.7573 kg |
| 50 st | 317.5147 kg |
| 100 st | 635.0293 kg |
Frequently asked questions
How many kilograms is 1 stone?
1 stone equals 6.3503 kilograms.
What is the formula to convert st to kg?
To convert st to kg, multiply the value by 6.35029318. The full formula is: kg = st × 6.35029318.
How do I convert kilograms back to stones?
Use the same calculator above and type your value into the kilograms field instead — it converts in both directions. Or use the reverse formula: st = kg ÷ 6.35029318.
Is the st to kg conversion exact?
The conversion factor used here (6.35029318) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.