Body Mass Index Percentiles for Girls (2 - 20 years)

Z Score  
Decimal Precision:
BMI Percentile Interpretation
Percentile < 5:Underweight
Percentile >= 5 and < 85:Healthy weight
Percentile >= 85 and < 95:Overweight
Percentile >= 95:Obesity
BMI = Weight / (Height/100)2
ZScore = ((BMI/M)L - 1) / (L * S)
At the extremes (> 97th percentile or < 3rd percentile), small differences in percentiles represent clinically important differences in BMI. At these extremes, the z-score is a more precise reflection of how far the measurement deviates from the mean, and is a useful tool for tracking changes.
Z-scorePercentile equivalent
+ 1.084
+ 2.097.5
+ 2.599.4
+ 3.099.7

  1. Percentile conversion from Z-Score is done by table look-up in the standard Normal Table. Percentiles are provided for Z Scores between -3.09 and 3.09. Values beyond these extremes return percentiles of 0.1 and 99.9 respectively.
  2. LMS Parameters for Girls: BMI for Age. National health and nutrition survey (NHANES), CDC/National Center for Health Statistics.
Legal Notices and Disclaimer
All information contained in and produced by the MedCalc 3000 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.
MedCalc 3000 is Copyright © 1998-2011 Foundation Internet Services, LLC    [Build 244179 v11.2.2]