Body Mass Index (Quetelet's index)


BMI   kg/m2
Decimal Precision  


Body Mass Index Interpretation

BMI < 18.5: Below normal weight
BMI >= 18.5 and < 25: Normal weight
BMI >= 25 and < 30: Overweight
BMI >= 30 and < 35: Class I Obesity
BMI >= 35 and < 40: Class II Obesity
BMI >= 40: Class III Obesity


  • The default unit of measure for weight is pounds. Please verify that the correct unit of measure has been selected.

Equations used
BMI = (Weight/2.205) / (Height/39.37)2


  1. Pi-Sunyer FX, Aronne LJ, et al. The Practical guide:Identification, Evaluation and treatment of Overweight and Obesity in Adults. National Institute of Health, National Heart, Lung, And Blood Institute, North American Association For The Study Of Obesity. NIH publication 00-4084, 2002.
  2. Khosla T, Lowe CR. Indices of obesity derived from body weight and height. Br J Prev Soc Med. 1967; 21: 122-128. PubMed ID: 6033482 PubMed Logo



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