Body mass index is a measure of the ratio of a person's weight to height. This parameter helps to determine deviations from normal body weight in one direction or another. Excess weight is dangerous for human health, as it often leads to heart disease. The online body mass index calculator allows you to quickly and accurately find out how your weight is normal. To calculate the body mass index, you must select your height and weight in the presented service.

Body mass index for women is considered normal if the indicator is in the range from 20 to 22. For men this indicator should be from 23 to 25. Statistics show that people who have this indicator in the range of 18-22 live longer on average than those with weight problems.

If your BMI is over 25, then this is a signal that you need to change your lifestyle. It is important to note that the formula used to calculate BMI can overestimate the obesity rate for athletic people, since the calculations do not take into account muscle mass.

Body mass index has become especially relevant in Western countries, where the problem with obesity has become quite acute. At the very beginning, the calculation of BMI was developed for sociological research, therefore, it is not entirely correct to make a medical diagnosis using these calculations.
However, the availability and simplicity of calculation made this calculator very popular among the population. If the index exceeds 30, then this most likely indicates obesity.
It should be understood that body mass index is not good for making a diagnosis, but it can help as a control when trying out a new fitness program or diet.
The BMI calculator will determine the starting point and allow you to track changes in body weight.

Body Mass Index (BMI) Formula

In order to find out your BMI, you only need to divide your weight in kilograms by the square of your height in meters.

BMI = WEIGHT / GROWTH 2

The formula does not take into account the sex and age of the person, despite the fact that the BMI of men is higher than the BMI of women, and the BMI is higher in middle-aged people, and in children and the elderly, this indicator is lower.

Pivot table of values

Interpretation of BMI indicators, in accordance with the recommendations of the World Health Organization (WHO)

The table characterizing the indicators of body mass index

Ideal body mass index (BMI)

Given the difference in muscle mass between the average man and woman (we do not take into account athletes), the best indicator is:

• 20-22 for women;
• 23-25 ​​for men.

The coefficient (number) of body mass index for men and women is the same, but the program interprets the result differently - you get a calculation depending on your gender.

For example, a man with a BMI of 18 or above has nothing to worry about, but women should not drop their weight to a BMI of 19 or below. So for a man with a BMI of 18.5, the program will inform you that everything is in order, and for a girl with the same body mass index, it will indicate insufficient body weight.

BMI - 18 or less

If you are clearly not eating enough, then you should normalize your diet as soon as possible.

Do you feel like you're eating enough? Then you need to visit a doctor as soon as possible and undergo an examination in order to exclude dangerous diseases.

Body mass index less than 16 is more dangerous for health than 30+.

BMI - 25 or more

You should not be upset and worried about a high body mass index. This indicator is very average and not suitable for everyone. Children and athletes should not be guided by it at all.

It's another matter if the imperfection of your figure is visible to the naked eye. Before starting and dieting, you should definitely consult your doctor. Tests may be needed to make sure that your excess weight is not the result of any medical condition.

And only after making sure that there are no contraindications, you can start losing weight.

For those who do not have time to visit a doctor J, we can advise you to minimize the consumption of salty, fried and fatty foods, as well as start doing banal exercises. This alone will seriously reduce the risk of developing cardiovascular diseases and significantly improve the general condition of the body.

How is body mass index calculated?

You can do it yourself. This task will be simplified by a regular calculator. Divide your weight in kilograms by your height in meters twice.

An example for a person with a height of 180 cm and a weight of 75 kg.

1. Height 180cm is equal to 1 meter and 80 centimeters, that is, 180cm = 1.8m.
2. 75/1,8 = 41,6
3. 41,6/1,8 = 23,1
4. Body mass index is 23,1

Body mass index and army

Growth less than 150 centimeters or body weight less than 45 kg provide the conscript with a reprieve for a period of one year. If, after examination and / or treatment, body weight does not increase, then such a man is exempt from conscription.

The right to a half-year deferral is granted to recruits with a body mass coefficient of less than 18.5 (aged 18-25) and below 19 (for men over 25).

Ideal weight according to the Kreff formula

Calculates ideal weight taking into account your age and body type. It is an improved version of Broca's index.

Keeping the body in shape is a key point in the prevention of heart and vascular diseases. Calculating your body mass index (BMI) is one way to check your healthy weight. This indicator will show how much the weight corresponds to the height of a person, and whether such a proportion does not pose a threat to life.

The basics of BMI concept were developed by the Belgian scientist Adolphe Quetelet, but the term itself was first coined after the publication of an article on obesity in the Journal of Chronic Diseases in 1972.

This index was created with the aim of determining the amount of mass of adipose, muscle and bone tissue in each individual, in order to further classify his weight as underweight, normal or overweight.

BMI (from the English "body mass index") has a direct relationship with the normal functioning of the whole organism. Because being overweight increases your risk of developing diseases such as:

• ischemic disease;
• type 2 diabetes;
• hypotension;

How to calculate your BMI?

The Quetelet index, better known as the body mass index, is a value that is determined by the formula: a person's weight divided by height in square meters.

For example, for a girl weighing 65 kg, whose height is 172 cm, the calculation will be made as follows: 65 / (1.72) 2 = 21.97. According to table number 1, it can be determined that this indicator is within the norm.

To simplify the calculation, you can use special online calculators that independently calculate body weight according to the specified parameters.

If you use pounds and inches to calculate your BMI, the formula looks like this: weight (lbs) / height (inches squared) * 703.

More details on how to calculate the mass index and decipher the results obtained can be seen in this video:

Decoding data: BMI table

According to the generally accepted classification, the Quetelet index has the following ranges:

According to studies by American scientists, 1% of men and 2.5% of women suffer from underweight. At the same time, the maximum life expectancy is observed in guys, whose BMI is 25-27 kg / m 2.

BMI: what to look for?

It should be remembered that the calculation of the mass index is not the basis for the diagnosis. For some people, particularly athletes, BMI can be deceptively high compared to actual body fat levels.

For example, the ideal weight for a 175 cm tall girl is 75 kg. But, if she has a thin physique, her norm should be calculated according to the scheme: 75 kg-10% = 68 kg. Conversely, overweight people should add 10% to their current weight.

When calculating BMI, the World Health Organization does not take into account the age and gender of a person. For children over 2 years old, the index is calculated according to the same scheme as for adults.

Studies conducted by British scientists have proven that the BMI of girls 12-16 years old is, on average, 1 kg / m2 less than the BMI of boys of the same age category.

Also, when calculating the mass index, the principle of the distribution of body fat in the body is not taken into account. That is, the indicators can be overestimated due to the accumulation of fat in the lower body, which, in principle, is not life-threatening. And at the same time, a person with a normal index should be more worried about health if excess fat is based in the abdomen.

In matters related to obesity, in addition to BMI, it is necessary to consider:

Application of BMI in the world

In 2005, Singapore found that Asians have a relatively higher percentage of fat than Europeans, with the result that the former are more likely to suffer from diabetes and diseases of the cardiovascular system.

Recently, the authorities of France, Italy, Israel and some other countries have changed the legislation, according to which models with an index below 18 are not allowed to participate in fashion shows. In this way, a healthy lifestyle is popularized and anorexia prevention among young people.

According to the laws of the Russian Federation, if a conscript's Quetelet index deviates from the prescribed standards (both upward and downward), he has the right to receive a deferral from military service up to six months. During this period, the conscript is obliged to undergo an examination and bring the indicators back to normal. For comparison, in Taiwan, recruits with a low or high BMI are immediately commissioned.

Calculating excess weight using BMI

With the help of BMI, it is easy to calculate excess weight, for this it is enough to correct the already known formula as follows:

Weight (kg) - BMI is normal (see table) * height (m 2)

For example, for a man under the age of 25 and weighing 115 kg, the normal BMI indicator will be the number 22. That is, his overweight is: 115-22 * (1.75 2) = 47.6 kg

This formula shows that the normal weight in this case should not exceed 67 kg.

So, body mass index is an important indicator developed to control the weight and health of every person. Despite some inaccuracy, BMI has been used in world practice for the primary diagnosis of obesity in patients of all age groups for many decades.

Presumably:

Body mass index (BMI)

Body mass index is a unique tool, invented two centuries ago, and is successfully used by people who are worried about their health. It was then, in the 19th century, that physicians - theorists and practitioners noticed that the so-called "healthy" mass of a person is directly related to his height and real weight. With the help of a special table, you can easily determine if there are a couple of extra pounds in your body and if you are at risk of obesity. To do this, it is enough to know only the basic parameters of your body.

Your body mass index value

For example, the input data are: weight = 85 kg, height = 165 cm.Therefore, BMI = 85: (1.65 x 1.65) = 31.2.

After calculating BMI, you need to compare your result with the table

After you have figured out your BMI, you need to refer to the chart, which will help determine if you have excess fat in your body. The exception is made by professional athletes-telesales with increased muscle mass.
For them, the indicators, of course, should be slightly higher.

Calculate BMI

If your body mass index is:

• 20-25 - do not worry: you have a normal weight, which is in harmony with the world;
• 25-30 - you should start taking care of your body; you are slightly overweight. Further accumulation of fat increases the risk of developing various diseases and deteriorating overall health;
• 30-35 - you have a clear tendency to obesity, so every effort must be made to reduce this indicator;
• 35 or more - you are obese; it's time to sound the alarm and start actively working to restore its former shape.

BMI table

Through propaganda healthy way life, many of us think about the ideal ratio of weight and height. A special formula helps to solve this issue. The body mass index calculated from it, although it does not give a complete picture, nevertheless allows us to determine: is there obesity?

What is BMI (Body Mass Index)?

This concept was coined by the Belgian sociologist and statistician Adolphe Quetelet (Adolphe Ketele). BMI or BMI (in the English version, the wording sounds like "body mass index") is a value that allows you to correlate a person's weight with his height and understand how they correspond to each other: the weight is normal, or it is below (above) the optimal level ... BMI helps doctors decide whether a patient needs weight adjustment.

BMI calculator

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// Function for calculating the mass index
// Start function Calculation

function calculation ($ height, $ weight)
{
$ height = trim ($ height);
$ weight = trim ($ weight);

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{
$ height = substr ($ height, 0, 1). ".". substr ($ height, 1);
$ index_mass = $ weight / pow ($ height, 2);
$ index_mass = substr ($ index_mass, 0, 5);
?>

Your mass index is

15 && $ index_mass18.5 && $ index_mass25 && $ index_mass30 && $ index_mass35 && $ index_mass40) $ rez = "obesity in the third degree.";
?>

You

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}
// End function Calculation

if (! empty ($ _ POST [‘calculation’]))
{
if (! $ height)
$ info = ’

Enter your height.

if (! $ weight)
$ info = ‘

Lead your weight.

if (count ($ info) == 0)
{
calculation ($ height, $ weight);
}
}

echo implode ($ info);

BMI calculation formula

BMI is calculated very simply: body weight, expressed in kilograms, must be divided by height, expressed in meters and raised to the second power (BMI is measured in kg / m2?).

As an example, let's calculate the BMI for a person weighing 90 kg and height 165 cm:

90 kg / 1.65x1.65 = 31.22

The calculated indicator indicates the presence of the first stage of obesity (this can be understood by examining the table below).

Interpreting BMI indicators

BMI Decoding
Up to 16 kg / m2? Severe underweight
From 16 to 18.5 kg / m2 Underweight
From 18.5 to 25 kg / m2 Normal body weight
From 25 to 30 kg / m2 Pre-obesity (overweight)
From 30 to 35 kg / m2 The first stage of obesity
From 35 to 40 kg / m2 Second stage of obesity
From 40 kg / m2? and higher Third stage of obesity

Don't be discouraged if the table categorizes you as fat people, to put it mildly. So, according to a study by Israeli scientists, men with a BMI equal to 25-27 kg / m2 (the concept correlates with the presence of excess weight) live longer than thinner or more fat representatives of the strong half of humanity.

How relevant is BMI?

It is worth remembering that

BMI

does not always correctly reflect the state of affairs. Men with significant muscle mass can be classified as obese. Meanwhile, the content of adipose tissue in them is often below the usual norms.

Race also matters. So, in 2000, WHO made a decision to reduce the obesity threshold for representatives of Mongoloid races by 5 units (up to 25 kg / m2). At the same time, researchers propose raising the obesity threshold for the Negroid race and for the Polynesians (up to 32 kg / m2). In order not to be mistaken, experts recommend along the way to determine the index of central obesity. Body Volume Index can also be used.

A number of other indices are also used to determine the optimal body weight:
1. For people whose height is in the range from 155 cm to 170 cm, the Broca index is ideal (this formula, by the way, is most often used in clinical practice). The formula looks like this: height in centimeters, subtract 100 and subtract 10-15%.
2. For athletes, the Borngardt index is suitable (it is calculated taking into account the volume of the chest). The formula takes this form: multiply the height in centimeters by the circumference of the chest and divide by 240.
3. The Davenport index is of interest. Weight, expressed in grams, must be divided by the height squared, expressed in centimeters (if the resulting index is more than 3, then this indicates the presence of obesity).

What is central obesity?

Central obesity is the excessive deposition of adipose tissue in the abdomen. It is determined by the ratio of the waist and hips. For women, the indicator should not exceed 0.9, and for men - one. A sagging tummy increases the risk of cardiovascular disease and contributes to changes in blood sugar levels (high risk of developing diabetes mellitus). That is why it is so important to use the central obesity formula when determining body mass index.

Currently, the body mass index is under increasing criticism. It is estimated that an older person with a pronounced tummy but no muscle mass may have a minimal BMI, and a bodybuilder will be recognized as a person suffering from the third stage of obesity. You should not completely and completely trust the formulas and calculations - everything is too individual.