Growth Percentile Calculator
Turn a child's measurement into a percentile using chart median and spread values you supply.
Quick answer: enter your details below and click Calculate Percentile — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Enter the child's measurement.
- Enter the chart median in the same unit.
- Enter the chart standard deviation and click Calculate Percentile.
About this tool
Clinical growth charts give a median and a spread for each age and sex. Enter a measurement together with the median and standard deviation from the chart you are using, and the tool computes a z-score and an approximate percentile. This calculator does not contain chart data itself, so it cannot diagnose growth issues — check with a clinician for any concern.
Frequently asked questions
Where do I get the median and spread?
From the growth chart for the child's age and sex, or from your clinician, who can read the chart with you.
Can I use this for weight too?
Yes, as long as the measurement, median, and spread all use the same unit.