What is BMI and how is it used?
Body Mass Index (BMI) is a number calculated from a person’s weight and height. It is widely used as a reliable indicator of whether a person has a healthy body weight for their height. Specifically, BMI value categorizes a person to underweight, normal weight, overweight, or obese depending on what range the value falls in.
For example, let’s calculate BMI of a 176 cm tall, 80 kg man:
This is the World Health Organization’s (WHO) recommended body weight based on BMI values for adults (men and women, > 18 years).
|Category||BMI range – kg/m2|
|Severe Thinness||< 16|
|Moderate Thinness||16 – 17|
|Mild Thinness||17 – 18.5|
|Normal||18.5 – 25|
|Overweight||25 – 30|
|Obese Class I||30 – 35|
|Obese Class II||35 – 40|
|Obese Class III||> 40|
BMI chart for adults
This is a graph of BMI categories based on the World Health Organization data: