What does BMI mean?
BMI stands for Body Mass index. It is used to give you an idea of whether you’re underweight, overweight or an ideal weight for your height. It’s useful to know because if your weight increases or decreases outside of the ideal range, your health risks may increase.

How do I calculate my BMI?
Choose your gender and preferred unit of measurement using the calculator below. Then use the sliders to enter your height and weight. Click on 'calculate' to work out your BMI and see what your result could mean.

How accurate is BMI?
The BMI is a useful measurement for most people over 18. However there are some limitations to be aware of as it may be influenced by age, gender and ethnicity.

For instance, adults with an athletic build could show as overweight. This is because muscle weighs more than fat and the BMI doesn’t take this into account.

If you're pregnant, the BMI does not apply. You should seek advice from your healthcare professional on what a healthy weight is.