BMI stands for 'Body Mass Index' and is a calculation made based on your height and weight.
Using the metric system, the formula is your weight in kilograms divided by your height in metres squared. That is weight kg/(height in metres)2 .
The BMI of an adult weighing 70kg and a height of 1.7m would be 70/(1.7)2 = 24.2 We can calculate your BMI for you if you put your height and weight ,in either metric or imperial figures, into our calculator on the Xenical / Orlistat medical questionnaire.
It is the marker for judging how much body fat you have and indicates whether you are overweight. People with a higher percentage of body fat tend to have a higher BMI, except for bodybuilders.
Carrying excess body fat, means that you are at increased risk of suffering health problems such as heart disease, stroke, diabetes and cancer. The normal BMI range for a healthy adult is 18.5 to 24.9 and anything more than this indicates that you are overweight.
BMI indicator for adults
OVERWEIGHT BMI: 25-29.9
OBESE BMI: 30 and above
By losing weight and therefore reducing your BMI you can greatly improve your general health and increase your life expectancy.