Body Mass Index (BMI) Calculator

To calculate your BMI simply enter your weight and height below and click the calculate button. You can enter your weight and height in either metric OR imperial measures.

Remember that BMI calculation is aimed only at healthy adults. It is not suitable for use by chidren, the elderly, pregnant or breastfeeding women or people with a high muscle content such as atheletes.

The calculator will translate your BMI into a meaningful message with suggested actions to either maintain or improve your weight.

  metres centimetres
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  stone pounds
Result: Your Body Mass Index (BMI) is:

What does this mean?

A BMI index under 18.4 suggests that you are underweight. Being underweight can lead to health problems such as malnutrition, loss of bone density and disrupted periods in women.

The diet of underweight people is often lacking in calories. Underweight people may also be burning off more calories than they are taking in due to excessive exercise. You should contact your GP or health professional to discuss how you can safely change your diet and lifestyle so that you become a healthy weight. This will probably involve increasing the amount of calories that you take in via your food and drink per day as part of a healthy balanced diet.

A BMI index of between 18.5 and 24.9 indicates that you are an ideal weight for your height. This means that you are less at risk from developing serious health problems such as heart disease and diabetes.

You should aim to eat a well balanced diet and exercise for at least 30 minutes a day to help maintain this healthy weight. As well as this you could help improve your health further by reducing the amount of salt in your diet and if you smoke, stop smoking.

A BMI of between 25 and 29.9 indicates that you are over your ideal weight range. This can lead to major diseases such as diabetes and heart disease.

You should aim to lower the number of calories you intake as part of a well balanced diet. More gentle exercise will help reduce your weight by burning more calories and will also increase your general energy levels. Exercise for at least 30 minutes a day and reduce 'snacking' between meals. Aim to lose around 1 - 2 pounds (1KG) per week until you reach your ideal weight.

A BMI of between 30 and 39.9 means that you are obese (significantly overweight). This can reduce your life expectancy and cause general tiredness as well as more serious health conditions such as high blood pressure, heart disease, osteoarthritis and type II diabetes.

You should aim for steady weight loss by eating a well balanced diet that contains lots of fresh fruit and vegetables and that contains fewer calories than your current diet. You should try to exercise more, once you start exercising regularly you will feel more energetic and find it easier. You should consult your health professional to discuss the changes you intend to make.

A BMI of over 40 indicates that you are very obese. This can reduce life expectancy and cause serious health issues such as heart disease, high blood pressure and type II diabetes.

You can help to reduce your weight by reducing the amount of calories you consume in your diet. This means reducing fizzy drinks, high fat snacks such as crisps, biscuits, sweets etc. Try and cut out any snacking between meals. If you want to start a an exercise program but lack the confidence speak to your GP or health professional who will be able to advise you on types of suitable exercise, support groups and suitable clubs / facilities. If you find motivating yourself hard then clubs or support groups can help with this.