Stone to Kilograms
Type stone (st), see kilograms (kg).
By Akash Yadav Updated 23 September 2026
Type a number above to see the answer.
Or tap a number:
The formula
How to convert stone to kilograms
To change stone into kilograms, multiply by 6.35029318.
kilograms = stone × 6.35029318
Going the other way: stone = kilograms × 0.157473044418
1 stone = 6.35029318 kilograms. This factor is the exact definition of the unit, not a rounded estimate.
Worked example
You have 12 stone. Multiply by 6.35029318. 12 × 6.35029318 = 76.2035 kg.
Common values
Stone to kilograms conversion table
| Stone (st) | Kilograms (kg) |
|---|---|
| 1 st | 6.3503 kg |
| 6 st | 38.1018 kg |
| 7 st | 44.4521 kg |
| 8 st | 50.8023 kg |
| 9 st | 57.1526 kg |
| 10 st | 63.5029 kg |
| 11 st | 69.8532 kg |
| 12 st | 76.2035 kg |
| 13 st | 82.5538 kg |
| 14 st | 88.9041 kg |
| 15 st | 95.2544 kg |
| 16 st | 101.6047 kg |
| 18 st | 114.3053 kg |
| 20 st | 127.0059 kg |
Before you rely on it
Stone and pounds need converting as one number
Weights in stone usually come with pounds — 12 st 3 lb — and those pounds are fourteenths of a stone, not tenths. Typing 12.3 gives the wrong answer. Either turn the pounds into a fraction first (3 ÷ 14 ≈ 0.214, so 12.214 st) or convert the whole weight to pounds and use pounds to kilograms.
1 stone is exactly 6.35029318 kg. It follows from two definitions — 14 pounds to the stone and 0.45359237 kg to the pound — so the factor is exact and only the displayed answer is rounded.
For a quick estimate, multiply by 6.35. Multiplying by 6 is easier and runs about 5 percent low: 10 st is 63.5 kg, not 60.
UK health services record weight in kilograms, so this is the conversion to use when a form, a prescription or a BMI calculation asks for kg and your scales show stone.
Common questions
Frequently asked questions
How many kg is 1 stone?
1 stone is exactly 6.35029318 kg.
How many kg is 10 stone?
10 stone is about 63.5 kg.
How many kg is 12 stone?
12 stone is about 76.2 kg.
How many kg is 15 stone?
15 stone is about 95.25 kg.
What is 11 stone 7 pounds in kg?
11 st 7 lb is 161 lb in total, which is about 73.03 kg.
How do I convert stone and pounds to kg?
Turn the whole weight into pounds first — stone × 14, plus the loose pounds — then convert the pounds to kilograms. Converting the two parts separately and adding them works too, but is easier to slip on.
Keep going
Related converters
- Kilograms to Stone kg → st
- Stone to Pounds st → lb
- Pounds to Kilograms lb → kg
- All weight converters
Every factor on this page is listed in our conversion methodology.