BMI or Body Mass Index is an index that indicates human health based on the height and weight of the body. The value calculated from the body mass or weight and height of a person. The body mass divided by the square of body height is indicated Body Mass Index or BMI. The unit of BMI is Kg/m2, where kg for body mass in kilogram and height in meter (m).
BMI indicator used to determine the underweight, normal weight, overweight, or obesity of a person.
This indicator widely uses to measure body health but it also has limitations. It is an estimation that is not considered body composition. Differences in body type and distribution of bone, muscle, and fat can not define BMI as the only method to determine the health status. Other health indicators also used along with the BMI.
Adult women with more then 20 years of age considered normal if BMI falls between 18.5 - 24.9 kg/m2for all body types and ages. In general, with the same BMI as men and women, women tend to have more fat than men. So the level of body fitness may differ for the same BMI for men and women.
Similarly, older people tend to have more fat than younger and athletes have less fat than non-athletes.
The methods and measurement procedures are different for children between the age of 2-20 years of age. Children's health status defined with percentile, calculated with age, gender, height , and weight-based on CDC guides line.
BMI CDC (Centres for Disease Control and Prevention) Chart for boys and girls according to BMI-age percentile growth given below. To download the BMI CDC chart click the link below.
A simple general method or formula used to determine the BMI of a person is to divide body mass by square of height. To calculate BMI in SI units the body mass considered in Kilogram and height in miter and in the USC system body mass is considered in pounds and height in inches. Besides the Ponderal Index (PI) methods used similar to BMI.
SI or METRIC UNITS
BMI=Body mass(kg) / height(m)2
BMI=703 x Body mass(lbs) / height(in)2
WHO's categories for adults Men and women:The World Health Organisation recommended the following categories for BMI. The healthy BMI range considered 18.5-24.9 kg/m2
|BMI||Status / Category|
|<16< /td>||Severe Thinness|
|30-35||Obese Class I|
|35-40||Obese Class II|
|40||Obese Class III|
BMI category for children and teens age 2 to 20 years:According to the CDC or Centers for Disease Control, a Prevention category considered percentile calculated base on BMI and age, and sex. Table shows below the category based on percentile.The CDC charts are different for boys and girls.
|Percentile (%ile)||Status / Category|
BMI range differs significantly by ethnicity throughout the world as ethnicity differs in different countries. As per WHO is normal BMI is 18.5-25, which follows the same in different countrues. And the same formula uses to calculate BMI. But the adverse effect of obesity is the same in whether in India, the USA, or other countries.
The following person should not use BMI