A child growth percentile calculator compares your child's height, weight, and BMI to other children of the same age and sex using official CDC and WHO growth charts. Enter your child's measurements to instantly see their growth percentiles.
A growth percentile shows how your child's measurements compare to other children of the same age and sex. For example, if your child is at the 75th percentile for height, they are taller than 75% of children their age. Percentiles are based on large population studies conducted by the CDC and WHO.
WHO growth charts (used for children 0-24 months) describe how children should grow under optimal conditions, including breastfeeding. CDC growth charts (used for children 2-20 years) describe how U.S. children actually grew during a specific time period. The AAP recommends WHO charts for infants and CDC charts for older children.
A single measurement is less important than the overall growth pattern. Concern is warranted if your child crosses two or more percentile lines between checkups, consistently falls below the 3rd percentile or above the 97th, or shows a sudden change in growth velocity. Always discuss concerns with your pediatrician.
BMI (Body Mass Index) percentile for children is calculated differently than for adults. Because children's body composition changes as they grow, BMI is plotted on age- and sex-specific charts. A BMI between the 5th and 85th percentile is considered healthy weight, 85th-95th is overweight, and above the 95th is obese.
This calculator uses the same official LMS (Lambda-Mu-Sigma) parameters published by the CDC and WHO that pediatricians use. Results are calculated using the standard Z-score formula and are equivalent to plotting your child on a printed growth chart. However, this tool is for informational purposes only and does not replace professional medical advice.
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