Child Growth Percentile Calculator (Height and Weight)
Compares a child's height against the WHO reference for their age and sex and returns a z-score with the matching growth percentile.
Recent
Formula
How the calculation works
The tool looks up the WHO median height and the standard deviation for the child's exact age in months and sex.
It subtracts the median from the measured height and divides by the standard deviation to get the z-score.
It converts that z-score into a percentile, so 50 means the child is at the middle of the reference group.
Common mistakes
- Judging growth from a single measurement, when the trend over several months tells far more than one reading.
- Comparing a child with siblings instead of the WHO reference, since family size says nothing about healthy growth.
When to use it
- Track whether a child is growing along a steady percentile line rather than dropping across it.
- Bring a z-score figure to a paediatric visit when the growth chart at the clinic is hard to read.
Worked example
A 24 month old boy 85 cm tall sits close to the WHO median, giving a z-score of about 0 and a percentile near 50.
Common questions
Is a low percentile a sign of a problem?
Not by itself, as a healthy child can sit at any percentile, and what matters is steady growth along the same curve.
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