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1.3 The body mass index (BMI)
The foundation of this calculation is the body mass index - an index number that can be used to interpret body
weight in terms of the risk it poses to your health.
The index number is calculated based on the body weight in kilogram, divided by the body height squared
(example: BMI =
75 kg
1,75 m x 1,75 m
= 24,5)
Classification of the body weight based on BMI
(Source: World health organization, 2000)
BMI (kg/m²) Classification
< 18.5 Underweight
18.5 - 24.9 Normal weight
25.0 - 29.9 Overweight
≥ 30.0 Adiposity
30.0 - 34.9 Adiposity level I
35.0 - 39.9 Adiposity level II
≥ 40.0 Adiposity level III
1.4 Rules for weighing
The weight of an adult can change by approx. 2-3 kg during one day.
For a reliable weight control it is therefore important to maintain constant weighing conditions.
That’s why it’s best to weigh oneself
• sober
• always at the same time: the time between 6 p.m. and 8 p.m. is best for body analysis.
• undressed
Ensure the sturdy and secure placement of the platform. Textile or soft floor surfaces can influence the
measurement results rather strongly.
In order to prevent falsification of the weighing result, the scale should not be moved for 3 minutes prior to the
weighing process.