How to calculate body mass
Body mass index (Body mass index) is one of the well-known and universally recognized measurements in determining overweight, obesity, leanness, and ideal weight.
It is a relationship or equation between a person’s weight and height, and this indicator is considered one of the indicators recognized It is adopted by the US National Institutes of Health and the World Health Organization as one of the best criteria for determining obesity.
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How is body mass calculated
You can easily, without the need for any programs, determine your body mass or index or any other body through some simple mathematical operations: and based on the indicator or the apparent result, people were divided into four categories represented in: – 1- Thinness
or underweight This is when the body mass index is less than 18.5.
2- Normal weight , when the body mass index ranges between 18.5 and 24.9.
3- Overweight when the body mass index ranges between 25 and 29.9.
4- Obesity or obesity when the body mass index ranges between 30 and 35.
5- Significant weight gain when the body mass index ranges between 35 and 40.
6- Excessive obesity when the body mass index is higher than 40.
The equation for calculating the body mass index is considered one of the most popular methods because of its ease and simplicity. The equation was developed by the Belgian scientist Adolphe Quetlet nearly 150 years ago, and the equation depends on body weight and length.
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Body mass index calculator
Body mass index = weight in kilograms / height * height in meters (height in meters squared).
From that, we note that the units of measurement used are kilograms and meters, so for example, with length, if it is in centimeters, then it must be converted to meters so that the calculation of the body mass index can be completed, as well as weight, it must be converted to kilograms if it is in grams.
Example: – A person whose height is 190 cm. When this height is entered into the equation for calculating the body mass index, this length is converted into meters, and this is done by dividing the height in cm by 100, as the meter equals 100 cm 190/100 = 1.9 meters
.
Now let’s calculate the BMI.
1- Give the person’s height, and after converting it from cm to meters, square this height, i.e. multiply it by itself.
1.9 * 1.9 = 3.61
2- After obtaining the square of the height, the weight is divided by the square of the height resulting from the previous step.
A person whose weight is 120 kg and is 1.9 meters tall, find his body mass.
Body mass = weight in kilograms divided by height in meters squared = 120
/3.61 = 33.24
35 .
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Despite the spread of this method to determine the ideal weight for the body, it is not possible to apply the BMI with some groups, including children, as this equation or that method ignores some factors that must be present with regard to children, and there are athletes and bodybuilders, as they have mass Large muscles represent weight in the scale, the elderly, as their muscle mass is low, the weak in structure, those with some diseases, pregnant women, lactating women, and adolescents who are still in the process of growth, meaning that the previous table and equation pertain to adults over 20 years.
There is more than one formula used in calculating the body mass index, as we mentioned, the most common one is the previous formula, but the latest formulas or equations for calculating the body mass index are considered the Valvic formula and Qom that were developed in 2005, and it is also a simple formula that helps in calculating the ideal body weight and the equation It is represented in: –
BMI = 22 * H2.
22 represents the ideal or recommended body mass, and H represents height in metres.
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In addition to calculating the body mass index, it can also be used to infer the body’s need to lose weight, the waist circumference, as the larger the waist size, the higher the percentage of fat, and vice versa. Those with a waist size higher than 80 are at risk and in excess obesity, and in the end they are all inferential indicators, and in the event of feeling the danger of weight gain, it is always preferable to consult a specialist.