BMI (Body Mass Index) is a simple measure based on the ratio between your height and weight. It shows the general range your weight falls into for your height and is a widely used indicator, also adopted by the World Health Organization.

It is calculated by dividing your weight by the square of your height. The result is assessed in four ranges: under 18.5 underweight, 18.5–25 normal, 25–30 overweight, over 30 obese.

BMI is a practical indicator but cannot distinguish muscle from fat. A muscular person may have a high BMI yet still be healthy. To see your body composition more clearly, it is better to evaluate it together with measures such as body fat percentage or FFMI.

BMI is based on the ratio between your height and weight and is a practical indicator also used by the World Health Organization.