1. What is BMI for Children?

BMI (Body Mass Index) is a screening tool for weight categories in children and teens. For children, BMI is age- and sex-specific and is referred to as "BMI-for-age."

2. How the Calculator Works

The calculator uses the standard BMI formula adjusted for male children:

Where:

• \( weight \) — Weight in kilograms
• \( height \) — Height in meters

Explanation: The result is compared against CDC growth charts for boys aged 2-19 years to determine the weight status category.

3. Importance of BMI Calculation

Details: BMI-for-age is the recommended indicator for screening overweight and obesity in children and adolescents. It helps identify potential weight problems that may lead to health issues.

4. Using the Calculator

Tips: Enter weight in kg, height in meters, and age in years (2-19). For accurate results, measurements should be taken with proper equipment.

5. Frequently Asked Questions (FAQ)

Q1: Why use BMI-for-age instead of regular BMI?
A: Children's body composition changes as they grow, so BMI must be interpreted relative to other children of the same age and sex.

Q2: What are the CDC BMI categories for children?
A: Underweight (<5th %ile), Healthy weight (5th-85th %ile), Overweight (85th-95th %ile), Obese (≥95th %ile).

Q3: How often should children's BMI be checked?
A: The AAP recommends BMI screening at least annually for all children and adolescents.

Q4: Are there limitations to BMI for children?
A: BMI doesn't distinguish between fat and muscle mass. Additional assessments may be needed for very muscular children.

Q5: Where can I find CDC growth charts?
A: CDC growth charts are available at https://www.cdc.gov/growthcharts/