Calculate your BMI
Body mass index, from your height and weight.
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What BMI tells you
Body mass index is your weight in kilograms divided by the square of your height in metres. The World Health Organization treats 18.5 to 24.9 as the normal range, 25 to 29.9 as overweight and 30 or above as obese.
It is a screening figure, not a diagnosis. It was designed to describe populations, and it does a reasonable job of flagging risk across a large group of people.
Where BMI falls down
BMI cannot tell muscle from fat. A heavily trained athlete can land in the overweight band while carrying very little body fat, and someone with low muscle mass can sit in the normal band while carrying more fat than is healthy. It also says nothing about where fat is distributed, and abdominal fat carries more risk than the same weight elsewhere.
Use it as one reading among several. Waist measurement, body composition, blood markers and how you actually feel all tell you things BMI cannot.
