BMI stands for body mass index. It is a measure of a person's body weight in relation to the person's height. In the metric system, the BMI is calculated using the formula: weight in kilograms divided by the square of the height in meters.
The body mass index is primarily used to determine whether a person is overweight, underweight or obese. The normal range of BMI is 18.5 to 24.9. Those who fall below this range are considered underweight, those with a range of 24.9 to 29.9 are considered overweight and those above 30 are obese. Although, BMI is a good indicator of obesity in individuals, body fat percentage, or BFP, is considered a more reliable indicator, as it compares actual fat mass with the total mass of the body.