Calculate BMI (Body Mass Index)

What Does BMI (Body Mass Index) Mean? / How to Calculate BMI

Your BMI is a means to determine with your weight is appropriate for your height.

Formula to Calculate BMI

Formula to Calculate BMI

You can calculate BMI by dividing your weight (kg) by your height (metres), squared.

Generally speaking, the higher your BMI, the greater your risk of developing serious medical problems.

What Are the BMI Categories?

  • Underweight Someone with a BMI of below 18.5 is considered to be underweight. Although some individuals are naturally slim, being underweight as a result of a poor diet, disease or eating disorder can have some very serious health risks. Illness associated with being underweight ranges from lethargy (tiredness) due to low energy intake, a weakened immune system, infections, vitamin deficiencies, weakened bones, fertility problems, anemia and heart problems. If you calculate BMI and find that it is under 18.5, you should consult your doctor immediately. Consider checking your symptoms at the NHS Direct site.
  • Normal A BMI of 18.5 to 24.9 means that you are a normal healthy weight. Your body is not at risk of developing weight related conditions. You still need to ensure that you eat a balanced diet containing fresh fruit, veg and a suitable intake of vitamins. If the amount of calories that you are consuming is matching your energy output, you will remain at a normal weight.
  • Overweight. A BMI of 25 to 29.9 means that you are classed as overweight. You may only be slightly overweight, and so may not have noticed. But it is important to note, that some of the negative effects of being overweight will have already taken effect. Damage may have been done to your joints, hormone system and blood vessels. The quicker that you act, the quicker that the effects of being overweight can be reversed. The most effective way of acheiving this is to reduce the amount of calories that you take in, and increase the amount of physical activity that you take part in.
  • Obese. With a BMI of 30 to 35, you are medically classified as obese. Obesity brings a greatly increased risk of any of the following weight related conditions:
    • Diabetes
    • Infertility
    • Asthma
    • Cancer
    • Heart Disease
    • Fatty Liver Disease
    • Arthritis

A BMI of over 35 means that you are Very Obese. As a result of this, it is highly likely that one of the above conditions will severely affect, and/or shorten, your life. However, it is never too late to do something about it.

A BMI of over 40 means that you are classified as Morbidly Obese, and as a result, you are 80 times more likely to develop Type II Diabetes than someone with a normal BMI. Being morbidly obese will greatly reduce your life expectency by over ten years.

Is BMI Applicable to Bodybuilders?

BMI can often be very inaccurate for bodybuilders, as those with very muscular physiques are often wrongly categorised as obese.If you have recently increased your body mass through building muscle, BMI is of little value to you. You can still calculate BMI to monitor your progress and/or body fat.

Calculate BMI

Enter your details into the form below to quickly calculate BMI.

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