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Body Mass Index (BMI)

Body Mass Index (BMI) is measure of body fat based on height and weight that applies to both adult men and women. We calculate your BMI to get an idea of whether you’re underweight, a healthy weight, overweight, or obese (for your height).

The BMI calculation doesn’t take into account your gender, age, ethnicity or other body composition factors (ie it does not differentiate between body fat and muscle mass). For that reason we use your BMI in conjunction with a range of other measures (including blood tests and your neck, waist and arm measurements) to determine your risk of health complications caused by your weight.

Your BMI is calculated by dividing your weight (in kilograms) by your height (in metres) squared.

You can calculate your BMI using the BMI calculator below.

BMI Calculator

Height (cm):

Weight (kg):



Your BMI is:

According to the Panel on Energy, Obesity, and Body Weight Standards published by American Journal of Clinical Nutrition, your category is:

BMI Classifications

Physicians regularly use BMI to assess how much an individual’s body weight differs from what is considered healthy (for a person’s height). The World Health Organisation provides categories based on the association between BMI and the risk of chronic disease and mortality. The classification ranges are:

Classification BMI
Underweight <19
Ideal BMI 19-25
Overweight 25-30
Obese 30-35
Severely Obese 35-40
Morbidly Obese >40

Your doctor will calculate your BMI and take a number of other measurements in your bulk-billed initial consultation.

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