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Compute my Body Mass Index (BMI) on-line calculator

Written by: Jacob Palme, professor, Stockholm University
First version: 22 Jul 2008. Latest version: 04 Jun 2014.


This is the only Body Mass Index caculator which can use either kilos/cm or pounds/feet/inches and which gives accurate data also for children. Body Mass Index is a code which indicates if you are underweight, normal or overweight, and can predict your life expectancy based on body shape and build.


What is my Body Mass Index (BMI) and what is normal body weight for my height? Which values of BMI indicates Anorexia?


Do you weigh too much or too little? If you are over 15 years old, you can determine this by computing your Body Mass Index (BMI). BMI is computed by taking your weight in kilograms, and dividing by the square of your height in meters.

Computation using
metric values

(kilograms and centimetres)

Computation using
imperial values

(lbs, feet and inches)

Input your height in centimetres:

Input your height in feet:
and inches (no decimals):
Input your weight in kilograms (no decimals) :
Input your weight in lbs. (no decimals)
Your BMI is: Your BMI is:

You have a better chance of living a long and healthy life if your BMI is between 20 and 24.

Interpretation of Body Mass Index for Adults:

below 16
serious anorexia
underweight, anorexia
normal weight
normal weight, longest life expectancy
above 35
grave obesity
Note: Very well-trained people can have a somewhat higher BMI than other's without being overweight.

Body Mass Index (BMI) for children

Compute the BMI for the child in the same way as for adults, using the tool above, and apply the BMI to the age of the child in the diagram below.

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