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About BMI
What is BMI?
Body Mass Index (BMI) is a simple indicator used to assess a person's body composition. It's calculated by dividing weight (in kilograms) by the square of height (in meters). BMI is used as a screening tool to identify potential weight problems in adults.
How is BMI Calculated?
BMI = Weight (kg) / Height² (m²)
For example, for a person weighing 70 kg and measuring 1.75 m:
BMI = 70 / (1.75 × 1.75) = 22.9
BMI Categories (WHO)
The World Health Organization (WHO) defines the following categories:
| IMC | (WHO) |
|---|---|
| < 18.5 | Underweight |
| 18.5 - 24.9 | Normal Weight |
| 25 - 29.9 | Overweight |
| 30 - 34.9 | Obesity Class I |
| 35 - 39.9 | Obesity Class II |
| ≥ 40 | Obesity Class III |
Interpreting BMI
BMI is a useful indicator but doesn't account for several important factors:
Factors to consider:
Two people can have the same BMI but very different body compositions.
BMI Limitations
BMI has several important limitations:
Not suitable for:
Alternatives to consider:
BMI is a screening tool, not a diagnostic tool.
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