1. What is BMI for Children?

BMI (Body Mass Index) for children and teens is calculated the same way as for adults, but the results are interpreted differently. For children, BMI is age- and sex-specific and is referred to as "BMI-for-age."

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

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

Interpretation: The result is compared to CDC growth charts to determine the BMI percentile for the child's age and sex.

3. Importance of BMI Calculation

Details: BMI-for-age is the recommended indicator for screening overweight and obesity in children and teens. It can be an early warning sign of potential weight problems.

4. Using the Calculator

Tips: Enter weight in kg, height in meters, and exact age (2-17 years). 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 by age and sex as they grow, so BMI must be compared 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), Overweight (85th-95th), Obese (≥95th percentile).

Q3: How often should children's BMI be checked?
A: The AAP recommends BMI screening at least annually starting at age 2.

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: What should I do if my child is in a high percentile?
A: Consult with a healthcare provider who can perform additional assessments and provide guidance.