Stones to Kilograms Converter
One Stone equals 6.35029318 Kilograms (1 st = 6.35029318 kg). Multiply a Stone value by 6.35029318 to get the equivalent in Kilograms. The calculator is above; the formula and worked examples are below.
Formula
kg = st × 6.35029318
Multiply the Stone value by 6.35029318 to get the equivalent value in Kilograms.
Example Conversions
1 Stone (st)
6.35029318 Kilogram (kg)
5 Stone (st)
31.7514659 Kilogram (kg)
10 Stone (st)
63.5029318 Kilogram (kg)
25 Stone (st)
158.7573295 Kilogram (kg)
100 Stone (st)
635.029318 Kilogram (kg)
Conversion Table
| Stone (st) | Kilogram (kg) |
|---|---|
| 0.1 | 0.635029318 |
| 0.5 | 3.17514659 |
| 1 | 6.35029318 |
| 2 | 12.70058636 |
| 5 | 31.7514659 |
| 10 | 63.5029318 |
| 25 | 158.7573295 |
| 50 | 317.514659 |
| 100 | 635.029318 |
| 250 | 1587.573295 |
| 500 | 3175.14659 |
| 1000 | 6350.29318 |
How to Convert Manually
Use these steps to convert Stone values to Kilogram without the calculator.
- Write down the value in Stone (st) that you want to convert.
- Multiply that value by 6.35029318.
- For example, 10 Stones × 6.35029318 = 63.5029318 Kilograms.
- Label the result as Kilogram (kg).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Stone and one Kilogram.
About Stone and Kilogram
The stone equals 14 pounds, exactly 6.35029318 kilograms. It survives almost exclusively for stating body weight in the UK and Ireland. The kilogram is the SI base unit of mass, defined since 2019 by fixing the Planck constant rather than by the old platinum-iridium prototype. It is the reference for every other mass unit on this site. One Stone equals 6.35029318 Kilograms (1 st = 6.35029318 kg). Stone is used in body weight in the UK and Ireland and in boxing and horse racing weight classes. Kilogram is used in body weight outside the US.
Precision and Rounding:Metric-imperial mass factors are exact (1 lb = 0.45359237 kg by the 1959 agreement), so precision is purely a display choice. One decimal place is enough for body weight and cooking; nutrition labeling, pharmacy, and lab work need the full factor before rounding.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Stones equals95.2543977Kilograms.
15 st × 6.35029318 = 95.2543977 kg
FAQ
How do I convert Stone to Kilogram?
Multiply the Stone value by 6.35029318 to get the equivalent value in Kilograms.
What is the formula for Stone to Kilogram?
The formula is kg = st × 6.35029318.
How many Kilograms are in 1 Stone?
1 Stone equals 6.35029318 Kilograms.
Can I convert Kilogram back to Stone?
Yes. 1 Kilogram equals 0.1574730444 Stones, and the related converter can reverse the calculation.
What are common names for Stone and Kilogram?
Stone is shown as st and may also be searched as stones. Kilogram is shown as kg and may also be searched as kilograms, kilo, kilos.
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