BMI Standards & Authority Guide
BMI Result
Explore the science, history, and mathematical framework of Body Mass Index.
Body Mass Index (BMI) & The Quetelet Index
The Body Mass Index (BMI), originally called the Quetelet Index, was developed by Adolphe Quetelet, a Belgian statistician, in 1832. It is a mathematical ratio designed to estimate body fat based on height and weight.
The Mathematical Formula
WHO Classification Standards
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Healthy Weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and Above | Obese |
Technical Limitations & Accuracy
It is critical to note that BMI is a screening tool, not a diagnostic one. It does not measure body fat percentage directly and may be inaccurate for athletes (high muscle mass) or the elderly (muscle loss).
The Mathematical Shift: New BMI Formula
Some mathematicians argue that the standard BMI formula is skewed for very tall or short people. The "New BMI" formula, proposed by Oxford University, uses a power of 2.5:
Clinical Application
While widely used, clinical assessments should ideally combine BMI with waist circumference and body fat percentage for a holistic health view.
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