Stone to KG Converter
Convert stone to kilograms instantly — type a value below and get the result right away, no page reload.
Formula
To convert stone to kilograms, multiply by 6.35029. To go from kilograms to stone, divide by 6.35029. One stone equals exactly 14 pounds, a unit still commonly used in the UK and Ireland for body weight.
Common stone to kg conversions
| Stone | Kilograms |
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Why this conversion gets searched so often
The UK and Ireland are among the few places that still use stone (st) for reporting body weight, while most of the rest of the world — and most fitness apps and medical charts — use kilograms. This makes stone-to-kg one of the most searched weight conversions among UK visitors.
How to convert stone to kg by hand
A rough estimate is to multiply the stone value by 6.35, or more simply, multiply by 6 and add a bit more for accuracy. For 10 stone: multiplying by 6 gives 60, and the true answer of 63.5 kg is only a little higher — close enough for a quick mental check. For anything precise, like entering your weight into a medical form that uses kg, the exact calculator above is worth using instead.
Where this conversion matters in real life
Body weight is the main place this comes up: UK gyms, bathroom scales, and casual conversation commonly use stone and pounds (a person might say "I weigh 11 stone 4"), while medical records, most of continental Europe, and international fitness apps use kilograms exclusively. This means anyone moving between a UK GP's office and an app like MyFitnessPal, or comparing their weight with someone outside the UK or Ireland, needs to convert. Airlines and gyms outside the UK also typically expect weight in kg rather than stone, which matters for luggage allowances and equipment weight limits.
Frequently asked questions
How many kg is 1 stone exactly?
1 stone equals exactly 6.35029 kilograms. For everyday use, rounding to 6.35 kg is accurate enough for almost any practical purpose.
Why is a stone equal to 14 pounds?
The stone has been used as a unit of weight in Britain since medieval times, originally varying by region and by what was being weighed (wool, meat, and other goods each had different "stone" values). It was formally standardized at 14 pounds in the 19th century and has remained the common unit for reporting a person's body weight in the UK and Ireland ever since.
What's a fast way to convert stone to kg in my head?
Multiply the stone value by 6, then add a little more — roughly half a kilogram for every two stone — to get close to the exact figure. For a more precise estimate, use 6.35 as the multiplier.
How do I convert kg back to stone?
Divide the kilogram value by 6.35029. You can also use the swap button on the calculator above to flip the conversion direction instantly.
Need other units too? Try the full converter with length, weight, temperature, text, color and crypto, or the dedicated KG to LBS converter.