stones to kg formula
To convert stone to kilograms, multiply the number of stone by 6.35029318. In symbols: kg = st × 6.35029318.
One stone equals 6.35029318 kilograms, and one kilogram equals 0.157473044418 stone. A stone is exactly 14 pounds, which makes it exactly 6.35029318 kg.
Worked example
Suppose you have 12 stone and need the answer in kilograms.
- Write the formula: kg = st × 6.35029318.
- Put in the number: 12 × 6.35029318 = 76.20351816.
- Round to suit the job. 76.2 kg is accurate enough for most everyday uses.
So 12 st is 76.20351816 kg. To check, convert back: 76.20351816 kg is 12 st.
Common stone to kilograms values
| stone (st) | kilograms (kg) |
|---|---|
| 1 | 6.35029318 |
| 2 | 12.70058636 |
| 5 | 31.7514659 |
| 10 | 63.5029318 |
| 20 | 127.0058636 |
| 50 | 317.514659 |
| 100 | 635.029318 |
Reference points
Some familiar amounts in stone, converted to kilograms:
- 8 st, a light adult: 50.8023 kg
- 10 st, an average adult: 63.5029 kg
- 12 st, a heavier adult: 76.2035 kg
- 14 st, about 89 kg: 88.9041 kg
Where you will use it
In the UK and Ireland, people state body weight in stones and pounds, while doctors and apps may ask for kilograms. Health forms, diets and fitness trackers need this.
Quick mental math
For stones and pounds, convert the stones, then add pounds times 0.4536: 12 st 4 lb is 76.2 kg plus 1.8 kg. Rule of thumb: multiply by 6.35. For 12 st this gives 76.2 kg against the exact 76.2, an error of under 0.1 percent.
Going the other way
Need the reverse? Use the kg to stones converter. For comparison, 1 kg is 0.15747304 st. To compare every weight unit at once, open the weight converter.
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