Body Mass Index (BMI)

Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to both adult men and women. BMI does not differentiate between body fat and muscle mass. Therefore, body builders and people who have a lot of muscle bulk will have a high BMI but are not overweight or obese.

BMI is defined as the weight in kilograms divided by the square of the height in metres (kg/m2). For example, an adult who weighs 70kg and whose height is 1.75m will have a BMI of 22.9.

BMI Classifications

The Body Mass Index calculation is based on World Health Organization’s BMI classification.

Body Mass Index (BMI) Classification
Less than 19 Underweight
Between 19 and 25 Ideal BMI
Between 25 and 30 Overweight
Greater than 30 Obese
Greater than 35 Severely Obese
Greater than 40 Morbidly Obese
Greater than 50 Super Obese

What your BMI result indicates

Less than 19 ~ UNDERWEIGHT
You are under optimum weight for your height. You could afford to gain a little weight.

Between 19 and 25 ~ ACCEPTABLE
You have a healthy weight for your height.

Between 25 and 30 ~ OVERWEIGHT
You are over optimum weight for your height. You may be facing health problems, so losing some weight would be a good idea.

Greater than 30 ~ OBESE
You are over optimum weight for your height. You may be facing health risks, so see your doctor to help you achieve a healthier weight.

Fat predominantly distributed around the waist is also a risk factor for health complications such as cardiovascular disease and type II diabetes. Fat predominantly deposited around the hips and buttocks doesn’t have this same risk.