What is BMI

BMI or Body Mass Index   is a measurement of body fat based on height and weight that applies to both men and women between the ages of 18 and 65 years.

BMI can be used to indicate if you are overweight, obese, underweight or normal. A healthy BMI score is between 20 and 25. A score below 20 indicates that you may be underweight; a value above 25 indicates that you may be overweight.

Move the sliders below to your body specifics to get your Body Mass Index score.

Body Mass Index calculator ( 3D )

What BMI means ?

Once you have calculated your BMI, you can determine your healthy weight range. 

If you have a BMI of:

• Under 18.5 – you are underweight and possibly malnourished.
• 18.5 to 24.9 – you have a healthy weight range for young and middle-aged adults.
• 25.0 to 29.9 – you are overweight.
• Over 30 – you are obese.

For older Australians over the age of 74 years, general health status may be more important than being mildly overweight. Some researchers have suggested that a BMI range of 22-26 is acceptable for older Australians. 

Some exceptions to the rule

BMI does not differentiate between body fat and muscle mass. This means there are some exceptions to the BMI guidelines :
   

Muscles – body builders and people who have a lot of muscle bulk will have a high BMI, but are not overweight...

Physical    disabilities – people who have a physical disability and are unable to walk may have muscle wasting. Their BMI may be slightly lower, but this does not necessarily mean they are underweight. In these instances, it is important to consult a dietitian who will provide helpful advice...