Program for calculating the normal weight or deviations from it. The following calculations are carried out:
1) body mass index (BMI) regardless of age,
2) body mass index (BMI) depending on age,
3) Waist-hip ratio indicates the ratio of waist to hip circumference,
4) Relationship between waist size and height

The Body Mass Index (BMI) - is a measure of the assessment of a person's body weight in relation to their height.
The BMI calculator is the best known and easiest way to calculate overweight. However, when using the calculator, it must be noted that the BMI is a relative value and that influencing factors such as gender, age, stature and percentage of fat or muscle tissue are not taken into account. As a result, it can happen that the BMI calculator shows that a person who does a lot of sport is overweight simply because of their body weight, although the weight comes mainly from muscles and not from fat. Age also plays a decisive role: It has now been found that a slightly increased BMI value can be beneficial for health in old age - here the body can fall back on the small fat deposits that it needs to survive longer illnesses . For this reason, you should only use the result of the BMI calculator as a guideline and set your body mass index in relation to your gender, your fitness and your age.

The waist-hip ratio indicates the ratio of waist to hip circumference. This can be calculated as follows: circumference of the waist / circumference of the hip; measuring the waist in the middle between the iliac crest and costal arch and the hip at the thickest point. This ratio should be less than 1.0 for men and less than 0.85 for women.

The waist-hip ratio provides the answer to the question of where the fat deposits are located. Abdominal overweight (recognizable by the silhouette, also characterized as an apple type) means a much higher risk of developing cardiovascular diseases.
In sports medicine, the quotient of the abdominal circumference and hip circumference is also referred to as the hip-abdominal circumference (HBU; Waist-Hip Ratio WHR). The waist circumference is measured in the middle between the iliac crest and costal arch parallel to the floor. The hip circumference is the largest dimension above the buttocks.

Measure waist circumference correctly:
undressed
in the morning before breakfast
just above the navel, at the thickest part of the abdomen
Relax your abs
exhale but do not pull in belly
Round up to full centimeters

WHtR (from the English waist-to-height ratio, waist-to-size ratio) denotes the relationship between waist circumference and height. In contrast to the widespread body mass index (BMI), it should make a statement about the distribution of body fat and thus allow greater information regarding the health relevance of overweight. [1]

According to a study by the Ludwig-Maximilians-University in Munich over eight years with more than 11,000 test subjects, the WHtR is better suited as an index for assessing health risks, since more precise conclusions can be drawn about the health-related abdominal fat percentage.

The main advantage of the WHtR compared to the BMI is that the BMI only allows a small amount of information about the health-related causes of an overweight or underweight, since, for example, very muscular men have a high BMI.