1. What is BMI for Children and Teens?

BMI (Body Mass Index) is a screening tool for overweight and obesity in children and teens aged 2-19 years. For children, BMI is age- and sex-specific and is often referred to as BMI-for-age.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula adjusted for age and gender percentiles:

Where:

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

Explanation: The calculated BMI is then compared to CDC growth charts to determine the BMI percentile for age and sex.

3. Importance of BMI Calculation

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

4. Using the Calculator

Tips: Enter weight in kg, height in meters, age in years (2-19), and select gender. For accurate results, measurements should be taken with minimal clothing and no shoes.

5. Frequently Asked Questions (FAQ)

Q1: Why is BMI interpreted differently for children than adults?
A: Children's body composition varies as they grow, and BMI must be compared against growth charts specific to age and sex.

Q2: What do the percentile ranges mean?
A: Underweight (<5th), Healthy weight (5th-85th), Overweight (85th-95th), Obese (≥95th percentile).

Q3: Is BMI accurate for all children?
A: BMI is a screening tool, not a diagnostic. Very muscular children or those with certain medical conditions may need additional evaluation.

Q4: How often should BMI be checked in children?
A: The AAP recommends BMI screening annually starting at age 2.

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