Growth Percentile Calculator for Girls (2-20 Years)
Check how your daughter's height and weight compare to the national averages using CDC growth charts. Visualizes percentiles (3rd, 50th, 97th) for girls aged 2 to 20.
About
Pediatricians use growth charts to track a child's development over time. A single measurement is less important than the trajectory of growth. This tool plots a girl's height and weight against data collected by the CDC (Centers for Disease Control and Prevention), helping parents understand if their child is following a consistent growth curve.
Being in the 50th percentile means the child is exactly in the middle of the pack. The 95th percentile means she is taller or heavier than 95% of girls her age. Significant deviations or sudden drops across percentile lines are usually what doctors look for to identify potential health or nutrition issues.
Formulas
The calculator uses the LMS method (Lambda-Mu-Sigma) to calculate Z-scores, which are then converted to percentiles.
Where X is the child's measurement, and L (Skew), M (Median), and S (Coefficient of Variation) are age-specific parameters from the CDC database.
Reference Data
| Percentile | Interpretation | Medical Context |
|---|---|---|
| < 3rd | Significantly Below Average | May require screening for failure to thrive or genetic causes. |
| 3rd - 15th | Below Average | Often normal for children with shorter parents (genetics). |
| 15th - 85th | Average Range | The standard range of healthy growth. |
| 85th - 97th | Above Average | Monitor weight-for-height to ensure proportionality. |
| > 97th | Significantly Above Average | May indicate rapid growth or potential obesity risks if weight-based. |