BMI Norms

BMI stands for Body Mass Index. It is a measure of body composition, using a ratio of height and weight (see procedures and calculators).

Once you have worked out you BMI score, use the table below to determine your BMI rating. The rating is the same for males and females. The table shows the World Health Organization BMI classification system.

classification BMI (kg/m2) sub-classification BMI (kg/m2)
underweight < 18.50 severe thinness < 16.00
moderate thinness 16.00 - 16.99
mild thinness 17.00 - 18.49
normal range 18.5 - 24.99 normal 18.5 - 24.99
overweight ≥ 25.00 pre-obese 25.00 - 29.99
Obese
(≥ 30.00)
obese class I 30.00 - 34.99
obese class II 35.00 - 39.99
obese class II ≥ 40.00

source: World Health Organization

Other BMI Calculations and Ratings



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