1. What is BMI for Children and Teens?

BMI (Body Mass Index) for children and teens is calculated the same way as for adults, but the interpretation is different. For children and teens, BMI is age- and sex-specific and is often referred to as BMI-for-age. The CDC provides growth charts to determine a child's BMI percentile.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

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

Note: For children and teens, the raw BMI number must be plotted on 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 tool 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 kilograms, 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?
A: Children's body composition varies as they grow, so BMI must be evaluated relative to other children of the same age and sex.

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

Q3: How often should children's BMI be checked?
A: The AAP recommends BMI screening annually from age 2, and more frequently if weight concerns exist.

Q4: Are there limitations to BMI for children?
A: BMI doesn't distinguish between fat and muscle mass. Athletic children may have high BMI due to muscle rather than fat.

Q5: Where can I find CDC growth charts?
A: CDC growth charts are available at CDC Growth Charts.