The Body Mass Index (BMI) is a value derived from the mass (weight) and height of an individual. Although it does not actually measure the percentage of body fat, it can be used as a rough guide. According to the World Health Organization (WHO), the normal range for BMI varies between 18.5 kg/sqm and 24.9 kg/sqm. People with BMIs below 18.5 are considered underweight, while those with BMIs above 25 are considered overweight or obese .
The formula for calculating BMI is:
weight in kilograms divided by height in meters squared (kg/m2). For example, if you weigh 70 kilograms (154 pounds) and your height is 1.75 m (5 feet 9 inches), your BMI is: 70 / (1.752) = 24.9