[an error occurred while processing this directive]
BBC News
watch One-Minute World News
Last Updated: Tuesday, 25 January 2005, 12:26 GMT
Body Mass Index
Scales
Doctors use body mass index (BMI) as a simple way to assess whether a patient needs to lose weight.

The calculation is based on comparing a person's weight with their body height. It applies equally to men and women.

To calculate your body mass index divide your weight in kilograms by the square of your height in metres.

Click here to calculate your Body Mass Index

A BMI of 25 to 29.9 is considered overweight and one 30 or above is considered obese.

People with BMIs between 19 and 22 live longest. Death rates are noticeably higher for people with indexes 25 and above.

The BMI is not infallible. For instance, it is possible for a healthy, muscular athlete with very low body fat to be classified obese using the BMI formula.

If you are a trained athlete, your weight based on your measured percent body fat would be a better indicator of what you should weigh.




SEE ALSO



FEATURES, VIEWS, ANALYSIS
Has China's housing bubble burst?
How the world's oldest clove tree defied an empire
Why Royal Ballet principal Sergei Polunin quit

PRODUCTS & SERVICES

Americas Africa Europe Middle East South Asia Asia Pacific