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Child and Teen BMI Calculator

Body mass index (BMI) is a measure of weight relative to height. For children and teens, BMI is interpreted using sex-specific BMI-for-age percentiles. This calculator reports BMI, BMI percentile, and BMI category for children and teens 2 through 19.

Child & Teen BMI Calculator | CDC Guidelines

👶 Child & Teen BMI Calculator

For ages 2-19 years | Calculate Basic BMI (For percentile results, use CDC calculator)

Child's Birth Date

Measurement Date

Gender

Height

Feet

Inches

Centimeters

Select height in feet/inches OR centimeters

Weight

Pounds

Kilograms

Select weight in pounds OR kilograms

⚠️ Important: This calculator provides basic BMI only. For accurate percentile results based on CDC growth charts, use the official CDC calculator.

📈 Child BMI Results

Age: 0 years 0 months

Gender: -

Basic BMI Calculation

0.0

Underweight Healthy Overweight Obese

Note: Adult BMI categories shown for reference only. Child BMI requires percentile analysis.

📊 Understanding Child BMI

For children and teens, BMI is interpreted differently than for adults. Instead of using fixed BMI categories, pediatricians use CDC growth chart percentiles that compare your child to others of the same age and sex.

Why percentiles matter:

Children's body composition changes with age
Boys and girls develop at different rates
Percentiles show where your child falls compared to peers
Growth patterns over time are more important than single measurements

🎯 For Accurate Percentile Results

This calculator provides only basic BMI. Accurate percentile calculation requires:

CDC's official growth chart data
Complex statistical modeling (LMS method)
Age- and sex-specific comparisons
Professional interpretation tools

💡 Professional Guidance Recommended: BMI is a screening tool. For diagnosis, growth assessment, and treatment recommendations, consult a healthcare provider.

👶 Why Child BMI is Different

Unlike adult BMI which uses fixed categories, child and teen BMI is age- and sex-specific. Here's why:

1. Growth Patterns Vary:

Children grow at different rates
BMI naturally changes with age
Puberty affects body composition differently in boys and girls

2. Percentile-Based Assessment:

Compares child to national reference population
Shows relative position (e.g., 75th percentile means heavier than 75% of peers)
Allows tracking growth patterns over time

3. CDC Growth Charts:

Based on nationally representative data
Updated in 2000 to reflect current population
Used by healthcare professionals nationwide

📋 CDC Percentile Categories

Healthcare providers use these percentile ranges:

Underweight: Below 5th percentile
Healthy weight: 5th to 84th percentile
Overweight: 85th to 94th percentile
Obese: 95th percentile and above

🏥 When to Seek Professional Advice

Consult a healthcare provider if:

You're concerned about your child's growth
Your child has rapid weight changes
You want accurate growth assessment
Your child has special health considerations

Disclaimer: This calculator provides basic BMI for informational purposes only. It is not a substitute for professional medical advice. Always consult a healthcare provider for growth assessment and health concerns.

For accurate percentile results: Use the official CDC Child & Teen BMI Calculator