Click on this link and complete the questions
http://www.weightwatchers.co.uk/heal.../calc_bmi.aspx
IMPORTANT: Please note that BMI is not as accurate if you are an athlete or very muscled (muscle weighs more than fat), as it can push you into a higher BMI category despite having a healthy level of body fat. It is also not accurate for women who are pregnant or breastfeeding, or people who are frail.
The BMI Calculator is only one guide about your overall health. Waist measurement, body fat level, blood pressure, cholesterol, physical activity, not smoking and the healthiness of your diet are also important. You need to get the whole picture.