What exactly is a body mass index?

Answer 1

BMI is determined by your weight, height, and age.... So there isn't just one normal BMI... it varies from person to person.

On average: under 18.5 is underweight18.5-24.9 is aceptable25-29.9 is overweightover 30 is obese

Answer 2

For an adult between 20 and 25. For a child, typically less but depends on their age.

See http://www.education.vic.gov.au/ecsmanagement/mch/childhealthrecord/growth/default.htm for children.

normaly:

under 18.5 is underweight18.5-24.9 is aceptable25-29.9 is overweightover 30 is obese

Answer 3

A Body Mass Index calculator measures body fat based on height and weight that applies to both men and women between the ages of 18 and 65 years.

Answer 4

A body mass index is a measure of your body fat level in accordance to your weight, age, and height. This is seen as unreliable because it doesn't account for muscle mass.

Answer 5

A healthy Body Mass Index is determined by a person's height and weight. A BMI of 30 is considered to be Obese I. A normal BMI is in the range of 18.5 to 25.