The UK stone (14 pounds) and the international kilogram both have exact definitions, making this a precise weight conversion in both directions.
How it works
Multiplying stone by 6.35029318 gives kilograms; dividing kilograms by that same factor gives stone back.
What this does not include
This does not include pounds directly — for stone-to-pounds conversion, use this site’s dedicated stone to pounds calculator instead.
How to use this calculator
- Enter a value in either stone or kilograms — the other field fills in automatically.
Frequently asked questions
Why is a stone equal to 14 pounds?
It’s a traditional British unit of weight, standardized at exactly 14 pounds, still commonly used for body weight in the UK and Ireland.
Where is kg-to-stone conversion most useful?
Comparing a body weight reading between a metric scale and the UK’s traditional stone-based convention.
Is this the same exact constant used elsewhere on this site?
Yes — the same international pound definition (0.45359237 kg) underlies both this and the stone-to-pounds converter.
