18 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
Equivalent to 252 pounds
To convert any other weight from imperial to metric, you can use our primary stone to kg conversion tool for instant results.
18 stone is 114.31 kilograms, which is 252 pounds exactly. The calculation is 18 × 6.35029 = 114.3052 kg, rounded to 114.31 kg.
People usually convert 18 stone when something concrete is riding on the number. A gym programme with targets written in kilograms, a form that asks for metric weight, or a set of bathroom scales that only shows kg: those are the moments this page gets used. In my weighing work I have lost count of the times someone has stood on a calibrated scale, read a number in one unit, and needed it in the other before they trusted it. The formula is always the same, stone times 6.35029, but what matters is that the figure you write down is right. The worked example above and the nearby-weights table below give you the single answer plus the context around it.
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.
At 5ft 6in, 18 stone gives a BMI of 40.5; stretch to 6ft 2in and it is 32.3. Same weight, very different reading, which is why the table is organised by height. BMI screens, it does not diagnose, and height is the single biggest lever on the result.
Is This a Healthy Weight?
| Height | KG | BMI | BMI Category |
|---|---|---|---|
| 5ft 0in (152cm) | 114.31 kg | 49.5 | Obese |
| 5ft 2in (157cm) | 114.31 kg | 46.4 | Obese |
| 5ft 4in (163cm) | 114.31 kg | 43.0 | Obese |
| 5ft 6in (168cm) (UK avg) | 114.31 kg | 40.5 | Obese |
| 5ft 8in (173cm) | 114.31 kg | 38.2 | Obese |
| 5ft 10in (178cm) | 114.31 kg | 36.1 | Obese |
| 6ft 0in (183cm) | 114.31 kg | 34.1 | Obese |
| 6ft 2in (188cm) | 114.31 kg | 32.3 | Obese |
Weights Close to 18 stone
| Stones & Pounds | Kilograms (kg) | Total Pounds |
|---|---|---|
| 17 st 8 lb | 111.58 kg | 246 lbs |
| 17 st 10 lb | 112.49 kg | 248 lbs |
| 17 st 12 lb | 113.40 kg | 250 lbs |
| 18 st 0 lb (This weight) | 114.31 kg | 252 lbs |
| 18 st 2 lb | 115.21 kg | 254 lbs |
| 18 st 4 lb | 116.12 kg | 256 lbs |
| 18 st 6 lb | 117.03 kg | 258 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 18 stone in kg?
18 stone is 114.31 kg. Multiply 18 by 6.35029 to get 114.3052 kg, which rounds to 114.31 kg.
Is 18 stone morbidly obese?
That depends on height, age and other factors. In the table on this page, 18 stone gives a BMI of 40.5 at 5ft 6in and 34.1 at 6ft 0in.
BMI screens rather than diagnoses, and loaded labels are best left to a qualified professional.
What is 18 stone in pounds?
18 stone is exactly 252 pounds. One stone is 14 pounds, so 18 times 14 is 252.
Could someone at 18 stone be referred for weight-management support?
Possibly, but that depends on BMI, health history, previous support and what local NHS services offer. A GP or a qualified weight-management team can talk through suitable options; a unit conversion alone cannot settle eligibility.
What is 18 stone in kg and pounds?
18 stone is 114.31 kg and 252 pounds. Same weight, three different units.