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What is Body Mass Index (BMI)?

What is Body Mass Index (BMI)?

The Body Mass Index or BMI is measure of body fat based on height & weight that applies to both adult men & women.


BMI does not differentiate between body fat & muscle mass.  So, body builders & people who have a lot of muscle bulk will have a high BMI but will not be classified as overweight or obese.

BMI Classifications



Ideal BMI19 – 25
Overweight 25 – 30
Obese > 30
Severely Obese > 35
Morbidly Obese > 40
Super Obese > 50

Different Types of Fat

An obese person can develop a certain body profile. There are Two different types of fat deposits. Fat predominantly distributed around the waist is also a risk factor for health complications such as cardiovascular disease & type II diabetes.  Fat predominantly deposited around the hips & buttocks does not seem to carry this same risk level.

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Victorian Government, Better Health Channel, available at
World Health Organisation, Global Database on Body Mass Index, available at

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Your BMR calculator generates the number of calories your body burns per day at rest. Your BMR with activity factor is the number of calories your body burns per day based on the activity factor you selected.

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