Use this tool to understand growth percentiles for height, weight, and BMI by age and sex. It’s designed for parents and caregivers: clear output, practical interpretation, and safety notes.
Safety note
Percentiles are screening information, not a diagnosis. If there are red flags (poor weight gain, sudden drop across percentiles, persistent feeding issues, lethargy, dehydration, breathing difficulty), consult a clinician.
Percentiles with clarity
Each result shows its percentile and one plain-language reading, worked out from the z-score on WHO cut-offs.
Optional downloadable report
Download a short report (where available) to keep for reference or share with caregivers.
Fast, mobile-first
Short form inputs and clean output, built for real use on a phone.
A percentile compares your child’s measurement to a reference population for the same age and sex. One measurement alone is not the full story, tracking over time is often more meaningful.
Height/length percentile
Helps you see where stature sits relative to peers of the same age and sex.
Weight percentile
Useful for routine follow-up; sudden drops need clinical context and review.
BMI (where applicable)
A supportive metric that needs interpretation alongside diet, activity, and clinical history.
Tip for accurate results
Measure weight with minimal clothing, and measure length/height carefully (for infants use recumbent length; for older children use standing height). Inconsistent measurement method can change percentile outputs.
Start the Growth Calculator
Enter date of birth, sex, height/length, and weight to see age-specific percentiles.
Boys and girls follow different WHO reference curves. Open the calculator pre-set for your child.
Privacy and responsible use
This tool is intended for informational screening and tracking. If you have concerns about growth, feeding, recurrent illness, or development, consult a clinician for personalized assessment.
