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23
Body mass index
The body mass index (BMI) is a figure that is commonly used to evaluate body weight. The figure is
calculated from body weight and height. The formula is: body mass index = body weight ÷ height
2
.
The measurement unit for BMI is [kg/m
2
]. According to the BMI, weight is classified for adults (20 years
and over) using the following values:
Category BMI
Underweight Severely underweight <16
Moderately underweight 16-16.9
Slightly underweight 17-18.4
Normal weight 18.5-24.9
Overweight Pre-obese 25-29.9
Obese (overweight) Class I obesity 30-34.9
Class II obesity 35-39.9
Class III obesity ≥40
Body fat percentage
Values will often be lower for fitness enthusiasts. Depending on the sporting activities performed, the
training intensity and the physical constitution, the results may still be
below
the stated standard values.
Please note, however, that there may be a risk to health in the case of extremely low values.
The subsequent body fat percentages serve as a guideline (for further information ask your doctor).
Male Female
Age Low Normal High Very high Age Low Normal High Very high
10-14 <11% 11-16% 16.1-21% >21% 10-14 <16% 16-21% 21.1-26% >26%
15-19 <12% 12-17% 17.1-22% >22% 15-19 <17% 17-22% 22.1-27% >27%
20-29 <13% 13-18% 18.1-23% >23% 20-29 <18% 18-23% 23.1-28% >28%
30-39 <14% 14-19% 19.1-24% >24% 30-39 <19% 19-24% 24.1-29% >29%
40-49 <15% 15-20% 20.1-25% >25% 40-49 <20% 20-25% 25.1-30% >30%
50-59 <16% 16-21% 21.1-26% >26% 50-59 <21% 21-26% 26.1-31% >31%
60-69 <17% 17-22% 22.1-27% >27% 60-69 <22% 22-27% 27.1-32% >32%
70-100 <18% 18-23% 23.1-28% >28% 70-100 <23% 23-28% 28.1-33% >33%
Body water content
The body water content in % is normally within the following ranges:
Male Female
Age Poor Good Very good Age Poor Good Very good
10-100 <50% 50-65% >65% 10-100 <45% 45-60% >60%
Body fat contains relatively little water, therefore body water content may be below the standard values in
persons with a high body fat percentage. On the other hand, endurance athletes may exceed the standard
values due to having low levels of fat and a high muscle percentage.
The body water calculation performed using this scale is not suitable for drawing medical conclusions,
for example in the case of age-related water retention. Consult your doctor where necessary. Body water
must not be added to the other values, as this is already included in the other analytical values (e.g. body
fat, muscle percentage).
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