BMI calculator

The BMI (Body Mass Index) is in existence as a measuring tool that has use in deciphering  if a personage is deemed to be obese, underweight or healthy, as in relation to their height. If the Index Mass of the Body neglects to be in the existence of a range that is considered healthy, then the person may face the risk of facing health related consequences. It is by virtue of of this that it is vital to know what the Index Mass of your Body is, so you may have the executive ability to better address any health related problems that you may rendezvous at a impending point in time. If a BMI reading is at 18.5 or lower, the personage is declared to be underweight. If the range that the person hood is in is betwixt 125 and 18.5, this is the normal amount that is considered healthy for people. If the personage is considered overweight, this means that the Index Mass of their Body is betwixt 30 and 25. Lastly, if the Index is of 30 or even higher, the person hood is considered obese.

People have always been endeavouring to ascertain what happens to exist as the most dynamic method to ameliorate their livelihood. Generally speaking, it is extensively acknowledged that to exist on a plane of the most advantageous quality of health possible, a personage needs to establish that they are hydrating on a basis that is daily, as well as masticating foodstuffs that are abounding with minerals, nutrients and vitamins. Exercise is another necessitous exigency that requires itself to be buttonholed if people are to attain an exceptional state of health. Yet even so, that doesn’t therefore commensurate of the sum of the aforementioned facets will ensure quality health. Sometimes what is required is a measurement, as people may feel more healthy than they actually are. A secure perception that is false may overcome an individual, and they may not address health related issues until they are later afflicted with an ailment. Aesthetic properties that people have when they look in the mirror may be deceiving, and just because someone is gaunt, that does not correlate that they are therefore of a physical state that is considered healthy. The same may be also true for personages who are of higher echelons of total body mass.

There are a varied array of methods to measure how over or under normally acceptable weight a personage may be, but the easiest to employ is that which has been established as the Body Mass Index measurement. Created in the 1800s, this measurement has been widely used by healthcare practitioners to assist in optimizing the quality of health of their patients, even into the present day. It has a void in the place of limits that pertain solely to the virtuosos in the healthcare industry, but the typical layperson may also find the Mass Index of their Body, and through independent means, look to acquiesce ways to upgrade their health in an accompanying manner. It is on the behalf of it’s easy appropriateness by anyone who has a hankering for it, that the Index calculator is the singular nonpareil tools that may have use  to make overall wellbeing and health reach it’s most superb level possible.

1Even when measurements were not as good as they currently are, medical professionals and scientists still attempted to conjecture approaches to get choice physical state as possible. With the formulation of the BMI however, people were more able to accurately judge what may be deemed as healthy, and what is it’s antithetic physical state. Today the Index is in use by medical practitioners to determine the state of physical health that personages are in. While not the supremely definite measurement available, it does give the personage that is undergoing the measurement a superb concept of where they are at healthwise, and what plan of offense to use if they happen to be nether or exceeding commonplace weight. Today’s article will cover what the Index is in full detail, so that you, the reader, may be more surpassingly enlightened with the apparatuses that are applicable that may better serve you in keeping your welfare and constitution at the most superb state possible.

What is BMI (Body Mass Index)?

There are 3 different levels of obesity, with class one being in the range of 30-35, class 2 consisting of the range from 35-40 and the 3rd and top-echelon of obesity existing on the plane of 40 and even more elevated. The converse side of the scale there are also 3 different levels of underweightness that people may exist on. The level of being mildly thin is at a BMI range of 18.5-17. More moderate levels of thinness are at 17-16. The highest severity of thinness exists in the realm that is a BMI rating of 16 or under. Albeit there is a bit of focus on underweight Body Mass Index numbers, most of the focus is meant for obesity. There is a separate scale that is meant for the leanness of an individual. The name of this is the Ponderal Index. But that is a different topic that will be covered at a later point in time.

2It should be noted withal, that the Index Mass of the Body is an inexact measurement. Just like humans and their creations, there are imperfections with this measurement tool. There are limitations on what it has the endowment to undertake the specifics of what it is adroit to measure. There are certain factors that it does not take into consideration, such as body fat. Because of this, personages that may otherwise be healthy may be measured to be obese, as has happened when some pro athletes, who were recognized to be American football players, have underwent Body Mass Index measurement. This may not only apply to pro athletes, but other athletic personages as well. The discrepancies do not end with athletic people. While  the Index values are practically duplicates for both woman and additionally the man, when it materializes to age, that is an independent matter. Because age is a matter that stands separate, there is a disparate scale of which teens and children are on, than the sigularity that is certified to measure the BMI in adults. For children, the BMI is the best measurement to use to find out what a child’s body fat is. It is with children and teens that the Index allocates body fat, and not with adults. This differentiation is imperative to make, because if it has a void where there should be understanding, the resulting differences from teens and children to adults would be utterly confounding.

Another issue that may arise with measurements done on a BMI basis, is that there exists a difference between peoples of different ethnicities, and how the body fat is appropriated across their bodies. As such, the readings that people may get may differ greatly and may not be the most supremely accurate. It is because of this that some scientists have suggested that separate the Index charts should be created that are more adjusted to the different ethnicities. This is because for example, people of Asian descent are more feasible to contract cardiovascular diseases and diabetes of the second type at BMI readings that are below 25, which runs conversely to what has been stated about high BMI measurements entailing these kinds of ailments. This is but one example of a certain population that does not fit the general outline of which the Index Mass of the Body was originally created for.

How does BMI work?

The Index Mass of the Body calculator works by calculating the index value of an individual while taking factors such as age and weight into deliberation. While it was originally conceived employing the metric system, it may also be converted to the American measurement system as well. As noted in the preceding section of text, there are shortcomings to using this measurement system, and as such, it should not be used as a substructure for an ultimate diagnosis. When the Index calculator is correlated in the most optimal way possible, it makes much easier for doctors to acquiesce methods to alleviate ailments that personages may be undergoing, or may experience if they do not make changes to the habits that their lifestyle is constituted of. Failure to make changes in lifestyle will only deteriorate health.

How to use the BMI calculator

To ascertain what a person hood’s Index is, one needs to divide the person hood’s weight by their height. This is the simple way of putting it, there are specifics that may be delved into to find the proper equation. First, the person hood’s height is multiplied by itself. This digit is then used as the denominator of a fraction. The higher echelon of the fraction is the person hood’s weight. This numerical quantity is then multiplied by 703, which is how the measurement would be working if the individual in question was being measured in terms of inches and pounds. If this measurement is done applying the metric system, it is a bit more simplistic, as there is a void in the place where multiplication of 703 after the weight has been divided by the height.

3This is if you have a longing to ascertain the desired value the manual way. There are a plethora of options available online where people may put in their height as well as weight and have this calculation done automatically for them. If not done here, Body Mass Index calculations may also be done with scales or in a specialist’s office. There are multiple sources of which this calculation may be made, so it should never be felt that this calculation is hard to attain, and therefore not worth the effort in trying to calculate. This may have been true back when the formula was being invented, but now that over a 100 years have met their end, it has become aggrandized and streamlined.

Who invented the BMI?

4Adolphe Quetelet is the personage who may be given credit for creating the Index. Born on February 22, 1796, he was the 5th of 9 children from a Flemish woman and a French man. Unfortunately for the Quetelet family, many of the children perished while still in childhood. Quetelet was only 7 years old when his father expired. By the age of 19, Quetelet began to teach mathematics, and it would only be a short 4 years later until he would graduate with a mathematics doctorate from the established University of Ghent.

Soon after his graduation, Quetelet made it his mission to convince a group of private donors and government officials that they should build an observatory in Brussels, and it was in 1828 that he accomplished this goal. Quetelet was something of a polyglot, but the languages that he spoke in were not of the linguistic manner, but of the scientific one. Although known for creating the Index, this was not a singular accomplishment that Quetelet was known for. Additionally, he was known to partake in a wide array of other scientific topics, such as sociology, meteorology, statistics, criminology, astronomy and the history of science. Later in his life, Quetelet would go on to the first ever international
conference on statistics, which took place in the year 1853. It is because of this and his other achievements in the related fields, that a historian of science, George Sarton would later dub Quetelet something akin to the monarch of statistics.
Quetelet was a believer in the conception of the average man. This idea states that there are measurements of which people in general populations generally adhere to on some level, with deviations from this showing that a personage may have too much or too little mass, for example. From this Quetelet asserted that there was this average man may be later formulated to be something of an ideal type of physical characteristics. There were critics of this theory, and there were many scientists that did not agree with the viewpoints that Quetelet was trying to establish. Some oven said that it was not possible that humans should exist in the ideal type that Quetelet was talking about.5

Why is it so important?

While there are discrepancies that may result from a BMI reading, that does not therefore mean that the measurement itself is pointless to use. When a Body Mass Index reading is on the high side, it may signal to a doctor that the personage in question may be at a magnified risk of contracting certain kinds of cancers, as well as diabetes and heart problems. On the other side of the coin, if the reading is too low, that may signal to the healthcare professional that the personage is malnourished, and for some reason may not be absorbing the nutrients and vitamins that they need to maintain an optimal level of health. On the micro level, this assists physicians in understanding any health related complications that a person hood may have later because of their Body Mass Index, and how they should address the issue before the problem begins to spin away from the realm of control.

There are other reasons that understanding why a person hood’s Body Mass Index is acknowledged to be important. It’s more than just a number, but a tool that will aid people in obtaining a higher quality of life. For one, on a practical level, it’s inexpensive for physicians to implement. There are other methods that healthcare professionals may use to survey how obese an individual may be, but these auxiliary methods are all recognized to be incredibly expensive and require the expertise of medical professionals of a highly trained nature. Being of such a high exceptional level, these are not always the most sought after methods of which to measure obesity. It’s just not practical to have to have to resort to these other methods, when the BMI measurements may simply be done with a pen and paper if that is all that one had with them! In spite of the marvelous advances in technology, going back to a simpler method of measurement may sometimes be the better option, as to expand on other areas may just get the issues at hand to get much more complex and confusing.

As stated previously, the BMI may also assist in predicting certain kinds of diseases that people may find themselves afflicted with at a future point in time. Having such foreknowledge goes a long way in the healthcare industry. This is important to know, as steps may be taken before the ailment surfaces upon an individual. It is also used to asses how much at risk the personage who is being measured may be at on contracting certain kinds of illnesses. For example, if the personage has a Body Mass Index reading that is above 25, that means that they are at a higher risk for diseases such as diabetes or heart related ailments, since the heart has to operate at a higher capacity to keep the body functioning. If this is known ahead of time, an exercise regimen and a diet plan may be established that would prevent the ailment from surfacing later. Conversely, if the individual is of an underweight BMI reading, this may mean that they are malnourished, and as such, a healthcare professional may be able to prescribe the right kinds of supplements, as well as the foods that should be consumed to ensure that overall health is raised, as is the BMI reading as well.6

BMI Table for Adults

On this table in the graphic below, the X-axis pertain appertains to the Body Mass Index of which people are being measured at. The vertical Y-axis is the height of the person, which is in inches, while the middle of the table consists of the weight the person is in, in American pounds. This chart does not include metric measurements. What differs about this table is that, there is more of a specificity into the weights that fall into the obese range. Generally, it is left at, that 30 or higher is considered obese. In this table however, it is expanded upon to include readings that go from 40-54, which is then of a classification all it’s own; extreme obesity. Not included in this table are the underweight BMI readings, as this starts at normal BMI and goes up from there. Both the obese and normal measurements are colored in white, while the extremely obese and overweight ranges are colored in pink.

BMI Chart for Adults

The following chart has measurements not only in the metric system, but in the American system that consists of pounds and inches as well. On the Y-axis of the chart is the height, with the Y-axis on the left pertaining to meters, and the Y-axis on right being in measurements of inches and feet. At the top of the chart, the X-axis goes by measurements of pounds, while the X-axis on the bottom of the chart go in metric kilogram increments. The chart itself is also color coded,showing that people in the underweight range, with a BMI of 18.5 or less are in white. Next are people in the normal healthy range, who have a BMI reading of 18.5-25, which is in yellow. After this is the group of people who are in the overweight category, which ranges from 25-30. This section is colored orange. Lastly the obese category is for personages that are of a BMI of 30 or higher, with this part of the chart being colored in red. Generally speaking, the taller the person is, the more weight they are allowed to have before being classified in another level on the BMI scale. It should be noted that most of this chart is taken up in the obese section, while the underweight section takes up the second most amount of space. After that are the normal range, than the overweight range.7

BMI Table for Children and Teens

The table directly below is associated with the Body Mass Index measurements for children that range from ages 2-20. The X-axis is on the top of the table, and it has a range that goes from 100 pounds to 250 pounds. On the Y-axis of the table on the left hand side, is the height that the person hood may be at. This starts at 5’0 feet at the top and goes down to 6’4 at the bottom of the vertical line. The measurements that are available are in the American system, not the metric system. The table has been color coded so as to differentiate the different weight levels that the children may be at. Normal healthy BMI readings from 18-24 are colored white, while overweight BMI readings are colored blue. At the far right of the spectrum is the overweight section, where the BMI readings are of 30 or higher, which is colored yellow. Lastly is the underweight section, that the table shows to be at a BMI rating of 17 or below, which is colored green. It is important to make notice, that the numbers that are used are not the most accurate in this table, as the cutoff between underweight and normal is 18.5, not 17. It just happens that the fractions of the numbers cannot be clearly exemplified in the graph below, so instead, they are rounded to the nearest whole number. While the direction that this table in has a downward trend, that is only the aesthetic qualities of the table, as they still correlate to have very similar meanings as the graphics that will be shown in the next section. It may seem that the two examples oppose each other when in fact they are actually showing the same kind of information.8

BMI Chart for Children and Teens

The following chart is one that may be appropriated to boys, ages 2-20. The X-axis of the chart is the range that the boys age may be in, while the Y-axis pertains to the BMI reading at which they may be placed. The likelihood of obesity increases as the age of the boy advances. Measurements of the 5th percentile or lower correlate the boy to being underweight, with the Body Mass Index reading being 13, as illustrated in the chart. If the boy is within the range of the 85th percentile, that therefore means that he is of an average, healthy weight. A BMI reading in this range would be 18.  If however he is above this and has reached into the 95th percentile, that then means that he is overweight, and as the example in the chart shows, a BMI reading in this section would be that of 21. Anything that has been registered above the 95th percentile means that the individual in question is obese, with a BMI reading of 23 or over.9

Because there is a difference between the amount of bodyfat that boys have compared to girls, that therefore means that a separate chart is needed for females, as is shown below. In the same fashion as the chart for the boys, the Y-axis is associated with the BMI, while the X-axis is that of the girl’s age, which as the the same as the previous chart, also goes from ages 2-20. The percentiles at which measurements are made is also the same as the boy’s chart, with the 5th to the 85th percentile being healthy, 85th to the 95th percentile being overweight, 5th to the 85th being underweight and anything over the 95th percentile being obese. Because girls have more body fat than boys, it is possible for both a girl and boy to have identical Body Mass Index readings, yet the girl could be of a healthy reading while the boy may be overweight.10


Since it’s creation, the Body Mass Index scale has aided not only medical professionals, but individual people as well in optimizing and understanding their wellness and health. In spite of it being imperfect, there is still great value in the information that it is able to give unto the people who implement it. It has the ability to show warning signs of potential diseases that may be contracted due to a higher or lower reading on the BMI scale. Depending on the individual, the Body Mass Index measurement may be different. This especially applies to teens and children, as there are different readings that pertain to both girls and boys. While both may be of the same BMI reading, it is possible that they boy may be overweight while the girl may have a healthy reading. As people age however, it is not necessary to have two different charts, as the same one may be used for adults in general. However there are still complications that may result; different groups of populations have varying degrees of body fat distribution, which may alter the readings to not be as accurate as it may like to be. There is also the issue of people who are elderly, and with the loss of muscle that they have, their BMI readings may not be that accurate either.

When Adolphe Quetelet created the Body Mass Index measurement system, he had no idea how widespread it would become. He had aspirations as to how widely it would be used, but he could have never imagined that it would become a global standard to define levels of obesity in people, and the wide impact that this would have in the fields of science and medicine. Without his mathematical prowess and interest in the sciences, human society would not be in the advanced state that it exists in today. It is because of he was able to find the body mass index of individuals, that countless people have had benefits with their health that they did not previously think was possible. Doctors have been able to treat ailments before they have even had a chance to come to fruition. Moreover, children and teens that may have been obese were able to have this condition alleviated before adulthood would have exacerbated any health issues that may have been experienced. But it is not only the obese that have benefitted from these measurements, as people who were underweight were able to find out how exactly to improve their quality of life. It is for these reasons that the Body Mass Index calculator is and will remain one of the most essential tools that people in the healthcare world may incorporate into their everyday practices.