# The formula for calculating the ideal weight - how to determine your normal weight?

## Ideal weight formula

It is traditionally believed that the formula for calculating the ideal weight is growth in centimeters minus one hundred. For example, a normal weight with a height of 180 cm is 80 kg. Despite the fact that this formula really allows you to assess the presence of a pronounced excess or lack of body weight, the resulting figure is erroneously considered ideal weight. Ultimately, gender and age must be considered.

In most cases, the ideal weight of a person is the weight that he had at the age of 18-20 years. However, often a sedentary lifestyle and regular excess of the daily calorie intake disrupt the metabolism and lead to a set of excess fat mass. On the other hand, playing sports and gaining muscle also increases weight - but with a positive effect on health.

Note that modern nutritionists do not start from the formula for calculating the ideal weight (or even from the body mass index), but from the percentage of body fat . This indicator allows you to not only calculate the conditional deviation from the “normal” weight, but gives an understanding of exactly how much excess fat is available. A high level of fat is dangerous, even if the number on the scale is perfect.

*// Formulas for calculating the ideal weight:*

- Brock's formula (growth minus one hundred)
- Lorentz formula
- Ketle body mass index

### Overweight or excess fat?

When determining the ideal weight according to the formula, you should always remember that adipose tissue is twice as light as muscles. A man with a height of 180 cm and a weight of 80 kg can be both a fairly complete man and a muscular athlete - however, the body mass index will be the same. The difference can only be seen with a complete analysis of body composition - including determining the amount of visceral fat .

Experts believe that it is the presence of visceral (internal) fat that poses a serious threat to health. In addition to the mechanical effect - such fat squeezes the stomach forward and creates a large belly - visceral fat is actively included in the metabolism. An excess of such fat is associated with elevated levels of “bad” cholesterol, high blood pressure and impaired insulin.

## Ideal weight calculation

The definition of ideal weight by the formula "growth minus one hundred" was proposed in 1850 by French researcher Paul Broca, based on an analysis of large volumes of statistical data. Interestingly, even the scientist himself in later works noted that the formula he derived was not at all universal - it is suitable exclusively for people with a height of less than 165 cm.

In 1929, Brock's formula was adjusted by the British scientist Lorenz. Now, the gender of the person was taken into account (the ideal weight formulas for men and for women are different), as well as age. Lorenz noted that the calculations will be correct only for those people under the age of 40.

*// Lorentz formula for men:*

- Ideal weight = (height minus 100) - (height minus 150) / 4

*// Lorentz formula for women:*

- Ideal weight = (height minus 100) - (height minus 150) / 2

### Body Mass Index (Ketele formula)

In parallel with the search for the formula for calculating the ideal weight, in 1869, the Belgian scientist Adolf Kötele proposed the theory of body mass index (BMI) . According to this indicator, it is possible to indirectly assess whether the weight of a particular person is insufficient, normal or overweight. The scientist claimed that a BMI of less than 18 means a lack of body weight, 18-25 is the norm, 25-30 is overweight, and a number above 30 is obesity.

*// Ketele formula:*

- BMI = (weight in kg) / (height in meters)
^{2}

It is important to note that modern science does not consider BMI an accurate characteristic for determining the presence of excess weight. Experiments show that body mass index revealed obesity in only a third of truly obese men and in half of women. The role, as we mentioned above, is played by the presence of internal fat - and its amount cannot be calculated by the formula.

## How to calculate excess weight?

Despite the fact that calculating the ideal weight can be useful in the presence of obesity (the formula can show that the real weight exceeds the normal one by 15-20 kg), for people with a normal physique, any mathematical methods for determining excess weight will give only an approximate figure. In the end, to determine the normal weight, it is important to understand what type of physique a particular person has.

For example, endomorphs are characterized by a slow metabolism and massive bone structure - in contrast to nature-thin ectomorphs with thin bones. Sports mesomorphs , in turn, are characterized by a fast metabolic rate and increased muscle mass. Each of these body types will have its own boundaries of normal and ideal body weight.

### Determining the percentage of body fat

In the material on determining the percentage of body fat, photographs of various types of male and female figures are presented - focusing on them, you can determine your approximate percentage of fat. The exact figure can be obtained by measuring body fat with a caliper or special “smart” scales with the function of determining body composition.

Athletic men have approximately 6–13% body fat, the average normal figure is 18–24%, and obesity starts at 25%. In girls, the percentage of fat is much higher - a sports physique is characterized by 14-20%, and the average level is 25-30%. Moreover, only this figure, and not the ideal weight formula at all, can show the presence of excess weight.

### ***

Using formulas to calculate your ideal weight or to determine your body mass index (BMI) is only suitable for people with marked obesity or dystrophy. The percentage of body fat is a much more accurate indicator. However, it is important not only to know the amount of fat in the body, but also to constantly monitor the change in this indicator.