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

Abstract: 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.

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

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Written by: , professor, Stockholm University
First version: 22 Jul 2008.
Latest revision: 28 Aug 2018.

What is my Body Mass Index (BMI) and what is normal body weight for my height? Which values of BMI indicate 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. Lower down on the page, interpretation of the Body Mass Index for children is described.

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:

BMI valueDescription
below 16 
serious anorexia
16 to 17.4 
underweight, anorexia
17.5 to 20.0 
normal weight
20.0 to 24.9 
normal weight, longest life expectancy
25 to 29.9 
30 to 34.9 
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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