BMI (Quetelet index)

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Warning! This site it targeted at medical professionals and medical students only. No claims are made of the accuracy of this calculator. Always confirm the results of this calculator before use. Never use the results of this calculator alone as a guide to patient care, always trust your clinical judgement. The authors of this calculator shall not be liable for damages resulting from use of this calculator.

This calculator calculates the body mass index (BMI, Quetelet index) using this equation:

BMI (Quetelet) = weight / length^2

If using other units, they are automatically converted to kilograms and meters by the calculator.

Interpretation of body mass index in adults according to the World Health Organization:

Classification BMI
Principal cut-off points Additional cut-off points
Underweight <18.50 <18.50
  Severe thinness <16.00 <16.00
  Moderate thinness 16.00-16.99 16.00-16.99
  Mild thinness 17.00-18.49 17.00-18.49
Normal range 18.50-24.99 18.50-22.99, 23.00-24.99
Overweight ≥25.00 ≥25.00
  Pre-obese 25.00-29.99 25.00-27.49, 27.50-29.99
Obese ≥30.00 ≥30.00
  Obese class I 30.00-34.99 30.00-32.49, 32.50-34.99
  Obese class II 35.00-39.99 35.00-37.49, 37.50-39.99
  Obese class III ≥40.00 ≥40.00