How to Calculate Child Growth Percentile
What is Child Growth Percentile?
Growth percentiles compare a child's height and weight to a reference population of the same age and sex. A child at the 50th percentile is exactly average; 10th percentile is shorter/lighter than 90% of peers; 90th percentile is taller/heavier than 90% of peers.
Step-by-Step Guide
- 1WHO growth charts (0–5 years) and CDC charts (2–20 years) are the standard references
- 2Z-score = (measurement − median) / SD for age and sex
- 3Track trend over time — sustained crossing of centile lines is more significant than a single reading
Worked Examples
Input
Boy age 7 · height 120cm · weight 22kg
Result
Height ~50th percentile · Weight ~50th percentile
Average for age and sex
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