Body Mass Index (BMI) | Geeky Medics

Body mass index (BMI)

BMI is used to categorise a person based on their weight relative to their height. 

BMI does not account for body composition and cannot differentiate between body fat and muscle mass. However, it provides a quick and easy way to categorise those at risk of being underweight or obese.

Calculating BMI

BMI is calculated as:

BMI is measured in units of kg/m^2.

Interpreting BMI

BMI can be categorised as:

• Underweight: ≤ 18.5 kg/m²
• Healthy weight: 18.5 – 24.9 kg/m²
• Overweight: 25 – 29.9 kg/m²
• Obesity class I: 30 – 34.9 kg/m²
• Obesity class II: 35 – 39.9 kg/m²
• Obesity class III: ≥ 40 kg/m²