Baby & Child Growth Percentile Calculator
Enter your child's measurements to see WHO and CDC growth percentiles instantly. Free, accurate, no sign-up required.
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WHO & CDC Data
Weight-for-Age
Track weight percentiles from birth to 20 years using WHO and CDC charts.
Height-for-Age
Monitor height or length growth with age-appropriate reference curves.
BMI-for-Age
Calculate BMI percentile for children aged 2–20 using CDC growth data.
Height Predictor
Estimate your child's adult height using the mid-parental method.
Educational tool — not medical advice. Verify with a qualified healthcare professional before making clinical decisions.
Frequently Asked Questions
How do I use this growth chart calculator?
Select your child's sex, enter their birth date and measurement date (or enter age directly), then type in weight, length or height, and optionally head circumference. The results table and percentile charts update instantly — you see every applicable WHO and CDC chart on a single page.
Why don't WHO and CDC percentiles match for the same child?
WHO and CDC charts describe different populations. WHO curves model how healthy, primarily breastfed infants grow under optimal conditions. CDC curves describe how American children actually grew across national surveys. A typical 6-to-12-month-old often lands at a different percentile on each because the reference populations differed in feeding methods and demographics.
Which growth chart should I use — WHO or CDC?
For US children, the American Academy of Pediatrics recommends WHO growth charts through age 2 and CDC growth charts from age 2 onward. This calculator shows both and highlights the AAP-recommended chart so you can see the clinically preferred reading while still viewing all applicable charts.
What percentile is considered healthy for a child?
Any percentile between the 3rd and 97th is within the normal range. What matters most is that your child tracks consistently along their own growth curve over time. A child steadily at the 15th percentile is growing just as well as one at the 85th — the number itself matters less than the trend across visits.
Is my child's data stored or shared?
No. All calculations happen in your browser. If you save a visit, the data is stored in your browser's local storage on your device only. Nothing is sent to any server. You can clear all saved data at any time.
How is BMI calculated for children?
BMI is weight in kilograms divided by height in meters squared (kg/m²). For children and teens aged 2–20, the raw BMI number is then compared against age- and sex-specific CDC reference data to produce a percentile. Unlike adults, where fixed BMI cutoffs apply, children's BMI interpretation depends on age and sex because body composition changes as they grow.