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  Body Mass Index  

Height (m)


Use feet and inches
(feet inches)
Weight (kg)
Body Mass Index (kg/m2)

Calculation(s) used

Body Mass Index interpretation

BMI (kg/m2) description
<18.5 Underweight
18.5-25 Ideal weight
25-30 Overweight
30-40 Obese
>40 Very Obese

NB: does not factor for muscular mass, pregnacy/breastfeeding, extremes of body shape or conditions which affect weight/height

1. BNF-59 (2010) British National Formulary. 59th edn. London: British Medical Association and Royal Pharmaceutical Society of Great Britain.

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