Why use percentiles for children?
Children's body composition changes with growth. Percentiles compare to same-age, same-sex peers.
Health Fitness
Pediatric BMI Calculator
Estimate pediatric bmi with quick inputs.
Fast, practical estimates
Adjust inputs for the most useful result.
What this calculator does
Pediatric BMI calculates body mass index for children and teens (2-19 years) using age and sex-specific percentiles from CDC growth charts. Unlike adult BMI categories, children's BMI is interpreted as percentiles because body composition changes during growth.
How it works
Calculate BMI (weight/height²), then plot on CDC growth charts to determine percentile for age and sex.
Formula
BMI = Weight (kg) ÷ Height (m)². Percentiles: <5th underweight, 5-85th healthy, 85-95th overweight, >95th obese.
Tips for using this calculator
- Use age/sex-specific percentiles, not adult categories
- BMI is screening tool, not diagnosis
- Track percentile trends over time
- Puberty affects body composition significantly
- Consult pediatrician for percentile concerns
Frequently asked questions
What percentile is healthy?
5th-85th percentile is considered healthy weight. Below 5th is underweight; above 85th is overweight.
Should I be concerned about high percentile?
Consult pediatrician. Growth patterns, muscle development, and overall health matter more than single measurements.