Your child’s height compared with WHO standards
Enter sex, date of birth and height to see your child’s percentile compared with children of the same age and sex — using World Health Organization (WHO) month-by-month reference tables for ages 2–19.
Your result appears here.
Method and validation
The tool uses the WHO LMS method with month-by-month tables: WHO Child Growth Standards (24–60 months, standing height) and the WHO Growth Reference 2007 (61–228 months). For height L = 1, so z = (height ÷ M − 1) ÷ S; ages between months are linearly interpolated. Percentiles are derived from the z-score using the normal distribution.
Test cases (same formula, checked against WHO medians M)
| Sex | Age | Height | WHO median | z-score | Percentile |
|---|---|---|---|---|---|
| Boy | 10 years | 137.8 cm | 137.8 cm | +0.00 | 50.1 |
| Girl | 13 years | 142.5 cm | 156.4 cm | -2.00 | 2.3 |
| Boy | 14 years | 170.9 cm | 163.2 cm | +1.00 | 84.2 |
| Girl | 7 years | 110.5 cm | 120.8 cm | -1.89 | 3.0 |
| Boy | 5 years | 119.2 cm | 110.0 cm | +1.99 | 97.7 |
Limits: ages 2–19 only; one measurement is not enough to conclude anything — doctors also look at growth speed, parents’ heights, puberty and bone age.
Sources: WHO Growth Reference 5–19 years – height-for-age · WHO – computation of centiles and z-scores · Pediatric Endocrine Society.