Welcome to the
 BMI-Club
 BMI (Body Mass Index)
   BMI-Script
   BMI Origin
   BMI Formula
   BMI Meaning
   BMI Statistic
   BMI Children
   BMI Criticism
   BMI Encyclopedia
   BMI Factsheet
 Waist-Hip-Ratio
 Waist circumference
 Broca-Formula
 Basal metabolic rate
 
 
 
 
 
 
  

BMI Formula


The Body Mass Index is calculated by the following formula:
body weight in Kilogramm divided by body size in Meter to the second
           orr
BMI = x KG / (y M * y M)

  x=Körpergewicht in KG
  y=Größe in M

Example for 175 cm size and 70 kg weight:
  BMI = 70 / (1,75 * 1,75) = 22,86

The resulting value is Kilogramm per Meter by the second or short KG/M2. In most cases this can be left. There is no really sense in this, because humans are no mathematical square. More about this also in BMI Criticism.

Tip for calculator:

If you try to use the formula in a hand calculator you get some problems. But with a little change it is be simple. So you can use:
  weight / size / size
Example for 70 kg weight and 1,75 m size:
  70 / 1,75 / 1,75 = 22,86

Step by step:
  1. weight in kg
  2. / (divided by)
  3. size in m
  4. / (divided by
  5. size in m
  6. =
(Thanks to Andreas Schoof)

Online BMI Calculator

The simplest way to calculate the BMI is using an online calculator. Our version is much more simple, because the values will be taken with sliders. So you can also change BMI and get a target weight. Check it out: BMI Calculator

BMI Disc

A other way are calculator discs. This are paper discs with numbers printed on it. You can turn the disc to slide weight and size together and then you can read direct the correct BMI.

More info about BMI:

BMI Script, BMI Origin, BMI Formula, BMI Meaning, BMI Statistic, BMI Kids, BMI Crisitism, BMI-Pedia BMI-Factsheet