Body Mass Index Calculator

Body Mass Index (BMI) is used to estimate your total amount of fat. It is only an approximate measure of the best weight for your health.

This calculator is designed for men and women over the age of 18.

A healthy BMI for an adult is between 20 and 25. For older Australians over the age of 74 years, your general health may be more important than being mildly overweight. Some researchers have suggested that a BMI range of 22-26 is acceptable for older Australians.

What your BMI means:

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

  • Under 18.5 - you are very 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.
Some exceptions to the rule:

BMI cannot easily differentiate between body fat and muscle mass. This means there are some exceptions to the BMI.

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