See where your child's length or height falls on the WHO growth curve for their age and sex — the percentile and z-score, from birth to 5 years.
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Pick the sex, enter the age in months (0–60) and the length or height in cm. The percentile and z-score update instantly.
Based on the WHO Child Growth Standards (0–60 months). Under 24 months, measure length lying down (recumbent); from 24 months, measure standing height — mixing the two shifts the percentile. This is an estimate, not a diagnosis: a steady curve over time matters more than a single reading. For a very low or very high percentile, or a sudden change, consult a pediatrician.
Percentile ≈ P49.2 · Normal rangeInformational estimate, not a diagnosis. We use the WHO Child Growth Standards (length/height-for-age, LMS method). Instant in-browser calculation, no account, no data sent. For concerns about a child's growth, consult a pediatrician.
✚ Results are for informational purposes and do not replace medical advice. For health decisions, consult a doctor.
A height percentile shows how a child's length or height compares with healthy children of the same age and sex in the WHO Child Growth Standards. The 60th percentile means the child is taller than about 60 of 100 peers:
For length, L = 1, so z = (height ÷ M − 1) ÷ S. A boy of 12 months at 77 cm (WHO median M = 75.7, S = 0.0363): z = (77 ÷ 75.7 − 1) ÷ 0.0363 ≈ 0.47 — about the 68th percentile, well within the normal range.
It shows how your child's length or height compares with healthy children of the same age and sex. The 50th percentile is the WHO median; the 70th means the child is taller than about 70 of 100 peers.
From the WHO growth standards using the LMS method. Your child's height becomes a z-score with z = (height ÷ M − 1) ÷ S, where M is the median and S the variation for that age and sex, then the z-score is read as a percentile.
Roughly the 3rd to the 97th percentile is considered the normal range. Being near the low or high end is not automatically a problem — what matters is that the child follows a steady curve over time.
Under 24 months a baby is measured lying down (recumbent length); from 24 months standing height is used. Standing height reads slightly shorter, so the WHO standards switch method at 2 years — always measure the way that matches the age.
Not on its own. Small and large children are both healthy if they grow steadily. Concern is warranted mainly if the child crosses several percentile lines up or down, or sits far outside the 3rd–97th range; a pediatrician can assess this.
No. Boys and girls have separate WHO growth curves, so the same length gives a different percentile depending on sex. The calculator uses the correct curve once you pick boy or girl.