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Calculator: Body mass index (BMI; Quetelet's index) in adults

Calculator: Body mass index (BMI; Quetelet's index) in adults


Important: Inputs must be complete to perform calculation.

BMI   kg/m2
Decimal precision  



BMI 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


Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

Information on this page may not appear correctly if printed.

Legal Notices and Disclaimer

All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

EBMcalc is Copyright © 1998-2023 Foundation Internet Services, LLC

Topic 13478 Version 11.0