Converting Stones (st) to Kilograms (kg) is a unique calculation primarily used in the United Kingdom and Ireland. While most of the world uses kilograms for body weight, and the US uses pounds, the British often use “Stone.” One stone is equal to 14 pounds or approximately 6.35 kg. This conversion is essential for medical forms, gym memberships, or international travel where scales use the metric system.
Master Weight Converter
The Formula
Multiply the Stones by 6.35:
st × 6.35 = kg
Example
A person weighs 10 st
10 × 6.35 = 63.5 kg
British Body Weight & Metric Insights
To visualize this, imagine a standard professional bowling ball. It weighs roughly 1 stone. If you had a pile of 6 large bags of sugar (1kg each), they would weigh just slightly less than that one bowling ball.
Frequently Asked Questions
One stone is equivalent to exactly 6.35029 kilograms. This conversion is vital for anyone using British fitness equipment or health apps that still use the traditional imperial stone but need to record data in the metric system.
Most people use the “6.3 rule.” Multiply the stones by 6 to get a baseline, then add about 1/3 of a kilogram for every stone. For example, if you weigh 11 stone: $11 \times 6 = 66$, plus about 4 extra kg, giving you roughly 70 kg.
While the UK officially uses the metric system (Kilograms) for medicine and science, the “Stone” is so deeply rooted in culture that many people still prefer it for tracking their own weight. This tool helps bridge that gap so you can understand your progress in both units.