latest news

30 April 12

The results of the 2012 Chilly Willy are now available - click here for the Men's reults and here for Ladies results

Photographs of the winners - here.


BMI Calculator

Check out our new BMI Calculator .



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What is BMI?

Body Mass Index (BMI) is a number calculated from a person’s weight and height. BMI is a reliable indicator of body fatness for people. BMI does not measure body fat directly, but research has shown that BMI correlates to direct measures of body fat, such as underwater weighing.
BMI can be considered an alternative for direct measures of body fat. Additionally, BMI is an inexpensive and easy-to-perform method of screening for weight categories that may lead to health problems.

How is BMI Used?

BMI is used as a screening tool to identify possible weight problems for adults. However, BMI is not a diagnostic tool. For example, a person may have a high BMI. However, to determine if excess weight is a health risk, a healthcare provider would need to perform further assessments. These assessments might include skinfold thickness measurements, evaluations of diet, physical activity, family history, and other appropriate health screenings.

Calculating BMI is one of the best methods for population assessment of overweight and obesity. Because calculation requires only height and weight, it is inexpensive and easy to use for clinicians and for the general public. The use of BMI allows people to compare their own weight status to that of the general population.

Calculating your BMI

Just enter your height and weight in the BMI Calculator, click on Imperial or Metric, and then click to calculate.

But remember this information is only a guide and it's aimed at healthy adults. It isn't suitable for children, young people or older people.

Also, if you have well-developed muscles, you may find that you will fall into the category of overweight on the Body Mass Index calculator , when in fact you may have a healthy body shape and very little fat. 

Whatever the results show, the most important thing to remember is that you need to make sure you're eating a healthy balanced diet and keeping physically active.

When you've calculated your BMI, check out the information on your category below.


If you're underweight, this may be of concern. You may need to put on weight, in which case this should be done as part of a well-balanced and nutritious diet. If your weight is very low, consult your GP.

OK Weight

If your weight is in the ok range, you don't need to lose weight. You're eating the right amount of food to keep your weight in the desirable range for health, but it's still important to make sure you're eating a healthy balanced diet. If your weight is at the lower end of the range, try to maintain it and don't be tempted to aim for the underweight category.


If you're overweight for your height, make sure you don't put on any more weight. Try to cut down on the amount you're eating, especially food and drinks high in fat or sugar, and try to do more physical activity. Aim to lose half to one kilogram (one to two pounds) a week, until you get down to the OK weight range. Check with your GP if you need to lose weight and you've had problems losing it in the past. Have a look at the How to be a healthy weight section for some practical tips.

If your weight has reached the obesity level, this could increase your risk of heart disease, Type II diabetes, high blood pressure and osteoarthritis. If you fall into this group, it's important for you to lose weight. If you've had problems trying to lose weight in the past, check with your GP first.


If an athlete or other person with a lot of muscle has a BMI over 25 is that person still considered overweight?

According to the BMI weight status categories, anyone with a BMI over 25 would be classified as overweight and anyone with a BMI over 30 would be classified as obese.
It is important to remember, however, that BMI is not a direct measure of body fatness and that BMI is calculated from an individual’s weight which includes both muscle and fat. As a result, some individuals may have a high BMI but not have a high percentage of body fat. For example, highly trained athletes may have a high BMI because of increased muscularity rather than increased body fatness. Although some people with a BMI in the overweight range (from 25.0 to 29.9) may not have excess body fatness, most people with a BMI in the obese range (equal to or greater than 30) will have increased levels of body fatness.

It is also important to remember that weight is only one factor related to risk for disease. If you have questions or concerns about the appropriateness of your weight, you should discuss them with your healthcare provider.


What are the health consequences of obesity of adult males?

The BMI ranges are based on the relationship between body weight and disease and death. Overweight and obese individuals are at increased risk for many diseases and health conditions, including the following:


Dyslipidaemia (e.g. high LDL cholesterol, low HDL cholesterol, or high levels of triglycerides)

Type 2 Diabetes

Coronary Heart Disease


Gallbladder disease


Sleep apnoea and respiratory problems

Some cancers


About two thirds of men (65 per cent) currently have a body mass index of more than 25 compared to just over half of women (55 per cent).

While almost all diets and weight loss products are targeted at women, more men are overweight, reveal new figures, yet most do not recognise the risks or feel enough concern to change their size. And this gap is set to widen in the future if current trends continue unabated. Three quarters of men (75%) will weigh too much by 2010, compared to just under two thirds of women (64%).

But men seem to be in denial about being obese. While 60 per cent of women are said to be on a diet at any one time, nearly 90 per cent of overweight men say they would not go to a slimming club. More than half say they would not consult their family doctor.

Although a large majority of men (over 80%) know that being overweight is associated with heart disease and high blood pressure, fewer understand the links with other significant health problems. Only 63% know that being overweight is linked to diabetes and joint problems and just 32% are aware of the link with erection problems. Reducing waist size alone can lead to significant improvements in health.