1 Stone to KG
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Medically ReviewedRounded to 2 decimal places. Standard UK/IE ratio (1 st = 6.35029 kg).
Exact Conversion Formula
Calculation Formula
To convert any other weight from imperial to metric, you can use our primary stone to kg conversion tool for instant results.
1 stone is exactly 6.35 kilograms, or 14 pounds on the nose. The full factor is 6.35029 kg, and every other stone conversion on this site is built on it.
This is the page people visit to check the definition itself rather than to weigh a person. I come back to this one figure more than any other in my work: it is the anchor behind every scale reading, pet weight and small parcel I convert. As a physical lump, one stone is exactly the weight of a 14 lb bowling ball. (And if you have ever wondered why Britain still weighs itself this way, our guide to why the UK still uses stone explains the habit.)
Reviewed by Dr Muhammad Usman, MBBS
Dr Usman reviews the conversion figures and BMI information on this page for accuracy. This is general information, not medical advice.
One stone is the unit everything else is measured against, so it is worth knowing it cold: 6.35029 kg, 14 lb, no exceptions. If you are weighing a baby, a small animal or anything that fits in one hand, this is the figure your scale is quietly using underneath its display.
Is This a Healthy Weight? BMI by Height
| Height | KG | BMI | NHS Category |
|---|---|---|---|
| 5ft 0in (152cm) | 6.35 kg | 2.7 | Underweight |
| 5ft 2in (157cm) | 6.35 kg | 2.6 | Underweight |
| 5ft 4in (163cm) | 6.35 kg | 2.4 | Underweight |
| 5ft 6in (168cm) (UK avg) | 6.35 kg | 2.2 | Underweight |
| 5ft 8in (173cm) | 6.35 kg | 2.1 | Underweight |
| 5ft 10in (178cm) | 6.35 kg | 2.0 | Underweight |
| 6ft 0in (183cm) | 6.35 kg | 1.9 | Underweight |
| 6ft 2in (188cm) | 6.35 kg | 1.8 | Underweight |
Weights Close to 1 stone
| Stones & Pounds | Kilograms (kg) | Total Pounds |
|---|---|---|
| 0 st 10 lb | 4.54 kg | 10 lbs |
| 0 st 12 lb | 5.44 kg | 12 lbs |
| 1 st 0 lb (This weight) | 6.35 kg | 14 lbs |
| 1 st 2 lb | 7.26 kg | 16 lbs |
| 1 st 4 lb | 8.16 kg | 18 lbs |
For more weight comparisons, see our full stone to kg chart. Need to go the other way? Try our kg to stone converter. You can also check your BMI using our BMI calculator.
Related Conversions
Frequently Asked Questions
What is 1 stone in kg?
Exactly 6.35029 kg, usually written as 6.35 kg. It is the base rate behind every stone-to-kilo conversion on this site.
What is 1 stone in pounds?
Exactly 14 pounds. A stone is defined as 14 lb, so this figure never varies.
Why is 1 stone 6.35 kg and not a round number?
Because the stone is defined through the pound: 14 lb multiplied by 0.45359237 kg per pound. The odd-looking decimal is simply what 14 imperial pounds works out to in metric.
What does 1 stone mean as a body weight?
On its own, very little for an adult: 6.35 kg sits far below adult ranges. This figure usually belongs to a young child, a pet or an object being weighed.
A child's weight should be read on an age- and sex-specific growth chart, and any concern is one for a GP or health visitor.
How do I convert stone to kg manually?
Multiply the number of stones by 6.35029. For 1 stone that is 1 multiplied by 6.35029, giving 6.35029 kg.