BMI Calculator
One measure commonly used to measure overweight and obesity is the Body Mass Index (BMI). The BMI is a relationship between weight and height that is associated with body fat, nutritional status and health risk.
BMI is determined by your weight in kg divided by your (height in metres)2.
For adults over 18, a healthy BMI is between 18.5 and 25. A result below 18.5 indicates that you may be underweight. A figure of or above 25 indicates that you may be overweight. (World Health Organisation figures 2000).
BMI is the most widely accepted tool to screen for overweight and obesity in children and adolescents. BMI in children changes significantly with age and can differ between gender and ethnicity, therefore any BMI calculation for children and adolescents must be adjusted for age and sex. This is done using the ‘BMI for age’ percentile ranges developed by the Center for Disease Control in the USA.
BMI calculator (for Adults)
Further information about overweight and obesity can be found at the Department of Health and Aging website (link).
Your BMI is:
| Classification | BMI |
| Underweight | <18.50 |
| Healthy Weight Range | 18.50 - 24.99 |
| Overweight: | 25.00 - 29.99 |
| Obese | 30 or more |