BMI Calculator for Children and Teens

BMI calculation for children and adolescents is more complex than for adults because healthy BMI changes with age and differs between boys and girls as they grow and develop. Rather than using fixed BMI categories, pediatric BMI is assessed using percentiles that compare a child to others of the same age and sex. This BMI-for-age percentile approach accounts for normal variations in body composition during growth. The Centers for Disease Control (CDC) and World Health Organization (WHO) provide standardized growth charts that healthcare providers use to track children's growth patterns over time. This calculator provides an estimate of your child's BMI percentile and weight category. Important: This tool is for screening purposes only. Always consult your child's pediatrician for proper growth assessment and interpretation of results.