Body Mass Index (BMI)—also known as the Quetelet Index—is a statistical measure used to relate a person’s weight to their height.
In practice, BMI does not directly measure body fat. Instead, it is a useful screening tool for estimating whether a person’s weight is healthy in relation to their height.
If you would like to calculate your BMI, please fill out the form below with accurate information.
Note: The calculated results should be used as a general guideline only and should never replace professional medical diagnosis. We recommend consulting a qualified physician before making any changes to your lifestyle.BMI below 18.5
A BMI below 18.5 indicates that you are underweight, and you may need to gain some weight. We recommend consulting your doctor or a nutrition specialist.BMI between 18.5 and 25
A BMI between 18.5 and 25 indicates that you have a healthy weight relative to your height. Maintaining a healthy weight can help reduce the risk of various diseases.BMI between 25 and 30
A BMI between 25 and 30 indicates that you are slightly overweight. We recommend consulting your doctor or a nutrition specialist and aiming to lose some weight for better health.BMI above 30
A BMI above 30 indicates that you are severely overweight. If you do not lose weight, your health may be at risk. We strongly recommend consulting your doctor or a nutrition specialist.Body Mass Index (BMI) is a measure used to identify underweight, overweight, or obesity based on a person’s height and weight. Since BMI does not take body composition into account, it has certain limitations and should therefore be used only as a general indicator of healthy body weight.
In fact, BMI does not directly measure body fat. Instead, it serves as a practical tool to estimate whether a person’s weight is healthy relative to their height. This index was developed between 1830 and 1850 by the Belgian scientist Adolphe Quetelet.
BMI Table for Adults
According to recommendations from the World Health Organization (WHO), Body Mass Index for adults is classified into the following categories. This table applies equally to both men and women aged 18 and over.
| Category | BMI Range |
| Severely underweight | Below 16.5 |
| Underweight | 16.5 to 18.5 |
| Normal | 18.5 to 25 |
| Overweight | 25 to 30 |
| Class I obesity | 30 to 35 |
| Class II obesity | 35 to 40 |
| Class III obesity | Above 40 |
Recommended BMI by age group
- Ages 19–24 = 22
- Ages 25–34 = 23
- Ages 35–44 = 24
- Ages 45–54 = 25
- Ages 55–64 = 26
- Ages 65 and over = 27
BMI Table for Children and Adolescents
According to World Health Organization (WHO) guidelines, Body Mass Index for children and adolescents aged 2 to 20 is classified into the following percentile-based categories.
| Category | Percentile Range |
| Underweight | Below 5% |
| Normal | 5% to 85% |
| At risk of overweight | 85% to 95% |
| Overweight | Above 95% |