About BMI


BMI - or Body Mass Index is a measure of the relationship between your weight and your height that is associated with body fat and health risk.

It is very easy to calculate your BMI.
First, measure your body weight and your height, and then match those measures on the chart to calculate your BMI. Knowing your ideal BMI means you can determine a healthy weight for someone of your height and build.

The equation for BMI is as follows:
BMI= weight in kilograms / height in m2
Your ideal BMI should be between 18.5 and 25.

BMI less than 18.5
If your BMI is less than 18.5 your result is in the underweight range and you should see a doctor about how to manage that.

BMI of 18.5 to 24.9
If your BMI is between 18.5 and 24.9 your result falls into a healthy BMI range

BMI of 25 to 29.9
Your result falls into the overweight range and you should take steps to reduce excessive weight

BMI of 30 to 40
A result this high means you fall into the obese BMI range and you should take steps to reduce excessive weight. Obesity is known to be a dangerous risk factor for cardiovascular and other diseases.

BMI of 40 or over
This result falls into the morbidly obese range of results and means you are dangerously overweight. If your score is this high, you urgently need to see a doctor for specialist intervention to reduce your excessive weight.

How accurate is BMI to tell me whether I need to lose weight?

BMI is used as an indication, it is always important to remember that individuals are unique. For someone who is very muscular for example, BMI may not take that into account. For those people a combination of the amount of fat (BMI) and where it is stored in the body (which can be seen from body shape) can be a better measure showing whether or not weight needs to be reduced.

What is central obesity?

Weight gain is a result of eating more calories than your body is burning.
Central obesity is the term to describe what happens when fat is stored excessively around the abdominal or stomach area. Central obesity is more strongly linked with cardiovascular disease than high BMI. What that means is, excessive weight, or a high BMI is an indication of risk to your health, and so is where the fat deposits in your body are situated, especially those around your stomach. If you have high BMI and central obesity your excessive weight is putting your health at higher risk.

How do I know if I have central obesity?

Central obesity can be measured simply by measuring waist circumference (measure your waist just above your navel) or by measuring the waist-to-hip ratio. A recommended waist circumference is less than 90 cm for men and less than 80 cm for women. If your waist circumference is very high - more than 102 cm in men and more than 90 cm in women you are 5 times more likely to develop diabetes than someone with a smaller waist size.