Child Growth Percentile Calculator
Check where your child falls on the WHO growth curves for ages 0-5. Enter age, sex, height, and weight to see the percentile band and a plain-language interpretation.
What Is a Growth Percentile?
A growth percentile tells you how your child's measurement compares with other children of the same age and sex. A weight at the 60th percentile means 60 out of 100 same-age peers weigh less. The World Health Organization publishes standard growth curves for ages 0-5 built from healthy, breastfed children across six countries, which is the reference this calculator uses.
How the WHO Curves Work
WHO curves plot length or height, weight, weight-for-length, and head circumference against age. Individual percentiles matter less than the trend — a child tracking steadily along the 25th percentile is growing normally, while a child who drops from the 75th to the 25th over six months may need evaluation. Pediatricians review these charts at every well-child visit.
What the Percentile Bands Mean
Between the 5th and 95th percentile is the typical band. Below the 5th percentile can indicate undernutrition, a genetic short stature pattern, or an underlying condition and warrants a conversation with a pediatrician. Above the 95th percentile for weight-for-length may indicate overweight, though a very tall child can also sit in that band without any concern.
Important Safety Note
This calculator is informational only and is not medical advice. Growth is more than a single data point — it requires a trend over time, a pediatric exam, and context like parental height. Only a pediatrician can interpret your child's growth in full. Contact your clinician if you see a sudden drop in percentile or ongoing feeding concerns.
Frequently Asked Questions
What is a normal growth percentile for my child?
Anything between the 5th and 95th percentile is considered typical. A child tracking consistently along any curve — even the 10th or 90th — is generally growing well. Pediatricians care more about the trend over time than any single percentile.
Why do WHO and CDC charts differ?
WHO charts (used here) are based on healthy breastfed children worldwide and represent optimal growth. CDC charts use older US data with more formula-fed infants. The American Academy of Pediatrics recommends WHO charts for ages 0-2 and CDC charts for ages 2 and older.
Should I worry if my child dropped percentiles?
A drop across two major percentile lines (for example 75th to 25th) over a short period warrants a pediatric evaluation. A single small fluctuation is usually measurement error or normal variation and not a concern.
Does this calculator work for premature babies?
Not directly. Preemies should be plotted using corrected age (actual age minus weeks premature) up to age 2. Specialized preterm growth charts (Fenton) are more accurate in the first year.
Is this tool medical advice?
No. It is an informational estimate using simplified WHO reference points. Only a pediatrician can interpret your child's growth in the context of their history, feeding, parental height, and physical exam.