How to read percentiles
A percentile compares a child with other children of the same age and sex in a reference chart. A value near the 50th percentile is near the middle, but many children normally sit higher or lower.
One result matters less than the growth trend over time. This calculator uses official WHO and CDC percentile reference tables and interpolates between chart points for the entered age.
When to discuss growth with a pediatrician
A single low or high percentile is not always a problem. Concerns rise when a child drops across percentile bands, is feeding poorly, is losing weight, or has other symptoms or developmental concerns.
FAQ
What does the 50th percentile mean?
It means the child is near the middle compared with children of the same age and sex in the reference charts.
Is the 10th percentile automatically bad?
No. A lower percentile can still be normal. Trends over time matter more than one isolated number.
Which charts are used here?
This tool uses WHO reference tables under age 2 and CDC child reference tables from age 2 onward.
Why can a percentile change over time?
Illness, feeding changes, measurement technique, puberty timing, and normal individual variation can all shift a plotted point.
When should I worry?
Falling across percentile bands, poor feeding, weight loss, developmental concerns, or values far outside the usual range should be discussed with a pediatrician.
Does this tool diagnose stunting or obesity?
No. It is an educational growth-chart estimator and does not replace clinical assessment.