5 Amazing Facts on BMI Calculator (Body Mass Index)

BMI Calculator

BMI Calculator : Body mass index (BMI) is a number based from the mass (weight) and height of an individual. The BMI is described as the body mass separated by the square of the body height, and is generally expressed in units of kg/m2, producing from mass in kilograms and height in meters.

The BMI may also be identified using a table or chart which shows BMI as a function of mass and height making use of contour lines or colors for different BMI different categories, and which may use some other units of measurement (converted to metric units for the calculation).

The BMI is a easy rule of thumb used to commonly categorize a person as underweight, normal weight, overweight, or obese based on tissues mass (muscle, fat, and bone) and height. That categorization is the topic of some debate about exactly where on the BMI scale the separating lines between categories should be positioned. Commonly approved BMI ranges are underweight: under 18.5 kg/m2, normal weight: 18.5 to 25, overweight: 25 to 30, obese: over 30.

BMIs under 20.0 and over 25.0 have been connected with greater all-cause mortality, growing risk with distance from the 20.0–25.0 range. The occurrence of overweight and obesity is the maximum in the Americas and lowest in Southeast Asia. The occurrence of overweight and obesity in high income and upper middle income nations around the world is more than twice that of low and lower middle cash flow countries.

The prevalence of overweight and obesity is the highest in the Americas and lowest in Southeast Asia.

Background of BMI Calculator

Adolphe Quetelet, The Belgian astronomer, mathematician, statistician, and sociologist, developed the base of the BMI in between 1830 and 1850 as he created what he known as “social physics”.

The modern-day term “body mass index” (BMI) for the actual ratio of human body weight to squared height was gave in a paper released in the July 1972 edition of the Journal of Chronic Diseases by Ancel Keys and others.

In this paper, Keys contended that what he known as the BMI was “…if not fully satisfactory, at the very least as good as any other relatives weight index as an indicator of relative obesity”.

The curiosity in an index that measures body fat arrived with observed growing obesity in prosperous Western societies. Keys clearly judged BMI as proper for population research and unacceptable for individual evaluation.

However, due to its straightforwardness, it has come to be widely used for primary diagnoses. Extra metrics, such as waist circumference, can be more helpful.

The BMI is globally expressed in kg/m2, resulting from mass in kilograms and height in meters. If pounds and inches are used, a transformation factor of 703 (kg/m2)/(lb/in2) must be applied. Whenever the term BMI is used casually, the units are usually omitted.

BMI Calculator Formula

BMI provides a simple number measure of a person’s thickness or thinness, permitting health professionals to discuss weight issues more objectively with their own patients. BMI was created to be used as a easy means of classifying regular sedentary (physically inactive) populations, with an typical body composition.

For these kinds of individuals, the value recommendations as of 2014 are as follows: a BMI from 18.5 up to 25 kg/m2 may reveal optimal weight, a BMI lesser than 18.5 indicates the individual is underweight, a number from 25 up to 30 may indicate the person is overweight, and a quantity from 30 upwards indicates the person is obese.

Lean male athletes often have a high muscle-to-fat ratio and therefore a BMI that is deceivingly high relative to their body-fat percentage.


BMI is relative to the mass and inversely proportional to the square of the height. So, if all entire body dimensions double, and mass scales normally with the cube of the height, then BMI increases instead of remaining the same.

This outcomes in taller people having a reported BMI that is uncharacteristically high, in comparison to their actual body fat levels. In assessment, the Ponderal index is based on the natural scaling of mass with the third power of the height.

Then again, many taller individuals are not just “scaled up” short individuals but tend to have smaller frames in proportion to their height.

Carl Lavie has composed that, “The B.M.I. tables are superb for identifying obesity and body fat in large masses, but they are far less trustworthy for identifying fatness in individuals.”

BMI Calculator Categories

BMI Calculator Categories

A regular use of the BMI is to evaluate how much an individual’s body weight leaves from what is normal or desired for a person’s height.

The weight excess or insufficiency may, in part, be paid for for by body fat (adipose tissue) although other aspects such as muscularity also affect BMI significantly (see conversation below and overweight).

BMI is used to generally define different weight groups in adults 20 years old or older. The exact same groups apply to both men and women.

The WHO respect a BMI of less than 18.5 as underweight and may reveal malnutrition, an eating disorder, or other wellness problems, while a BMI equal to or greater than 25 is considered over weight and above 30 is considered chronically overweight.These varies of BMI values are valid only as statistical categories.

  • Underweight: BMI is less than 18.5
  • Normal weight: BMI is 18.5 to 24.9
  • Overweight: BMI is 25 to 29.9
  • Obese: BMI is 30 or more

What is my BMI?

What exactly is my BMI?

There are many ways to find your BMI.

  1. Charts and tables, such as the one above, are one particular easy way to determine out your BMI.
    To apply the table above, locate your height on the left side of the chart, then go around to the weight that is nearest to yours.
  2. There are also many online BMI calculators, such as this one on our website.


At the top notch of the chart you can see your BMI, and at the bottom part of the chart you can see which group you fit into – healthy weight, overweight, or obese chart that assists you figure out your BMI based on your height and weight.

Some examples

Think about a woman who is 5 ft. 4 in. tall is regarded as overweight (BMI is 25 to 29) if she weighs in at between 145 and 169 pounds. She is regarded as obese (BMI is 30 or more) if she weighs 174 pounds or more.

A man who is 5 ft. 10 in. tall is considered overweight (BMI is 25 to 29) if he weighs between 174 and 202 pounds, and is obese (BMI is 30 or more) if he weighs 209 pounds or more.

BMI Calculator Chart

My BMI Calculator

You can also analyze your own BMI. The real formula to determine BMI uses metric system dimensions: weight in kilograms (kg) divided by height in meters, squared (m2).

When using pounds and inches, the method needs to be modified slightly. Multiply your weight in pounds by 703. Separate that by your height in inches, squared:

BMI = (your weight in pounds x 703) ÷ (your height in inches x your height in inches)

For instance, if you weigh 120 pounds and are 5 ft. 3 in. (63 in.) tall:

BMI = (120 x 703) ÷ (63 x 63) or 84,360 ÷ 3969 = 21.3

This is nicely within the healthy weight range.

Are there any issues using the BMI Calculator?

Doctors and nurses frequently use BMI to help discover out if a person might have a bodyweight problem. BMI provides a good estimation of total body fat for most people, but it does not work well for everyone.

For example, body builders or other very muscular people can have a large BMI because of their own muscle mass, even though they’re not always overweight. The BMI can also undervalue body fat in people who have lost muscle mass , such as some older men and women.

For most grown ups, the BMI is a good way to get an idea of healthful weight ranges. But it’s not constantly the final term in determining if a person is overweight or obese.

There are other stuff to think about when judgment how much somebody should weigh. A individual with a high BMI should be examined by a health care provider, who may use other factors such as skinfold width (a measure of body fat), waist size, evaluations of diet and family health problems, and other elements to find out if a humans weight might pose a health risk.

Does BMI Calculator Works for Body Builders?

BMI Calculator for Children and Teens

BMI can be determined the same way for kids and teens as it is for adults, but the figures don’t have the same meaning.

This is simply because the normal amount of body fat alterations with age in children and teens, and is various between boys and girls. So for children, BMI levels that determine being normal weight or overweight are based on the child’s age and gender.

To account for this, the US Centers for Disease Control and Prevention (CDC) has created age- and gender-specific progress charts.

These charts are used to convert a BMI number into a percentile based on a young ones sex and age. The percentiles are then utilized to determine the different weight groups:

  • Underweight: less than the 5th percentile
  • Normal weight: 5th percentile to less than the 85th percentile
  • Overweight: 85th percentile to less than the 95th percentile
  • Obese: 95th percentile or higher

An easy way to determine your child’s BMI percentile is to use the CDC’s online BMI percentile calculator at this web site.

Even in a younger person, being overweight or obese can cause health problems. And it may immediately increase the risk for specific health problems later in life, which includes some kinds of cancer.

It also raises the chances of being obese or obese as an adult, as well as the risk of health issues that can come with this.


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