Comparing weight relative to height is a quick and easy way of finding out if someone is a healthy weight for their height.
A useful way to judge if a person is overweight or obese is to calculate their body mass index (BMI). BMI should only be used for adults, i.e. after 18 years of age when growth has stopped.
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Body mass index
BMI is worked out by:
weight (kg)
height (m) x height (m)
The BMI can be compared with the following ranges: