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Why is BMI important?

The body mass index (BMI) is a simple way to check if your weight is healthy in relation to your height, or if it poses a risk to your health. A healthy BMI is 18.5 – 24.9. At BMI 25 – 29.9 you’re classed as overweight, and a BMI of 30 or over means you’re classed as obese. In general, the higher your BMI, the greater your risk of a range of medical problems.


How is BMI calculated?

BMI is calculated by dividing your weight in kilos by your height in metres squared. The BMI calculator below is intended for adult use only. BMI only provides a general indication of the appropriateness of your weight in relation to your height. Please also note that BMI may not provide an appropriate means to gauge your weight if you are very muscular or an athlete, because muscle weighs more than fat but BMI doesn’t account for this. In these instances you may appear to have a higher BMI but actually still have a healthy proportion of body fat.

How LighterLife works

Losing weight with LighterLife is a great choice to make. Why? Because our programme has been developed by experts with many years of experience of working with people with weight concerns. LighterLife is much more than just a diet or weight-loss programme. LighterLife helps people change their lives, because we know the real secret to life-changing weight loss is all in the mind. Thinking about what you put into your mouth isn’t enough. What matters is what goes on in your head.

BMI Calculator

content provided by NHS Choices