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BMI or Body Mass Index is a widely used method used to determine whether a person is of a healthy weight.  It is a calculation designed to assess how overweight (or underweight) a person might be relative to their height.


Height (m) x Height (m)


Adults should aim for a BMI between the 18.5- 24.9 range. The world health organisation WHO has recommended that the following categorise be used






Normal weight


Overweight (Grade 1 obesity)


Obese (Grade 2 obesity)


Morbidly obese


There are groups of people who may not fall into these categories. These may include athletes as their body may be composed of more muscle than a person of the same weight that works in an office.  But BMI is a good point of reference.


Click on the diagram to display the BMI table