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
BMI = (Weight/2.205) / (Height/39.37)2
  • The default unit of measure for weight is pounds. Please verify that the correct unit of measure has been selected.
  1. National Institutes of Health (NIH), National Heart, Lung, and Blood Institute (NHLBI). The practical guide: identification, evaluation, and treatment of overweight and obesity in adults. Bethesda: National Institutes of Health. 2000, NIH publication 00-4084.
  2. Khosla T, Lowe CR. Indices of obesity derived from body weight and height. Br J Prev Soc Med. 1967; 21: 122-128.
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