Children's BMI Calculator
Calculate a child's BMI and BMI-for-age percentile (ages 2–19). Uses CDC growth chart data. Results are educational — always consult a pediatrician.
Medical Disclaimer: This tool is for educational purposes only. BMI is a screening tool, not a diagnostic measure. Consult a qualified healthcare professional for medical advice about your child's weight and health.
Frequently asked
questions
Adult BMI uses fixed thresholds. Children's BMI-for-age compares a child's BMI to other children of the same age and sex using percentile curves, because body fat changes as children grow and differs between boys and girls.
Below 5th percentile = Underweight. 5th–85th percentile = Healthy weight. 85th–95th percentile = Overweight. Above 95th percentile = Obese. These are screening categories, not diagnoses.
BMI is just one health indicator. A pediatrician evaluates growth trends over time alongside other health measures. Always consult your child's doctor before making diet or lifestyle changes.