Understanding Your Body Mass Index
Learn the formula, the categories, and the historical context of the BMI measurement.
What is BMI?
Body Mass Index (BMI) is a screening tool that uses your height and weight to estimate if you have a healthy weight. It was invented by Adolphe Quetelet (1830s-1850s).
BMI Calculation
- Example:70 kg / (1.75 m)2 ≈ 22.86
WHO Categories
The World Health Organisation (WHO) defines the normal weight range for adults as a BMI between 18.5 and 24.99. Categories extend from Seriously Underweight to Obese.
Limitations
BMI is a screening tool, not a diagnostic one. It doesn't distinguish between muscle and fat, making it less accurate for athletes, the elderly, and certain ethnic groups.
