Free online BMI calculator for children and teens aged 2-19 using CDC growth chart percentiles. Includes age-adjusted BMI percentile reference and health guidance. All calculations run locally. | No signup · Data never leaves your device
Zero Dependencies · Works OfflineFree online BMI calculator for children and teens aged 2-19 using CDC growth chart percentiles. Includes age-adjusted BMI percentile reference and health guidance. All calculations run locally.
School Checkups：Understand your child's BMI percentile from school reports at home, spot weight trends early, and discuss with your pediatrician.
Growth Monitoring：Regularly track height and weight to follow BMI percentile trends over time, catching growth spurts or slowdowns early.
Healthy Eating Plans：Use BMI results alongside pediatrician advice to create age-appropriate exercise and nutrition plans for your child.
Child BMI uses age- and sex-specific percentiles instead of fixed cutoffs (18.5/25). Because children are still growing, the same BMI number means different things at different ages. CDC uses percentiles: under 5% underweight, 5-85% healthy, 85-95% overweight, 95%+ obese.
This calculator is for children and teens aged 2-19. Infants under 2 use WHO growth standards (weight-for-length), not BMI. Ages 20+ should use an adult BMI calculator.
BMI percentile shows where your child falls relative to peers of the same age and sex. For example, 85th percentile means higher BMI than 85% of peers. This is more meaningful than the raw BMI number for children.
Do not panic — consult a pediatrician for professional assessment. BMI is a screening tool, not a diagnosis. Doctors consider family history, diet, activity level and more. Never put a child on a diet without medical guidance.
Boys and girls develop at different rates with different body fat percentages. Girls naturally have higher body fat during puberty, so sex-specific growth charts are essential for accurate assessment.