
The full name of BMI is Body Mass Index and it is the most common index to measure the physical health in the world. Through the index, we can understand whether the appropriate amount of body fat, and the calculation of BMI is as follows:
BMI = Weight (kg) / [Height (m) x Height (m)]
Eg. 65kg / 1.7 x 1.7 mm = 16.3 (underweight)
The relationship between BMI classification of Asian adult and the risk of serious illness is as follows:
| Classification of BMI | BMI (kg / m 2) | Risk of suffering serious illness |
| Underweight | < 18.5 | Low (Underweight has other effects on health) |
| Normal | 18.5 - 22.9 | General |
| Edge | 23 - 24.9 | Increase |
| Moderate Obesity | 25 - 29.9 | Moderate |
| Severe obesity (overweight) | >= 30 | High |