1. What is BMI for Children and Teens?

BMI (Body Mass Index) is a screening tool for overweight and obesity in children and teens. For children, BMI is age- and sex-specific and is often referred to as BMI-for-age. Unlike adults, children's BMI must be compared against growth charts.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

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

Note: For children and teens, the BMI number alone is not diagnostic. It must be plotted on a BMI-for-age growth chart to determine the percentile.

3. Importance of BMI Calculation

Details: BMI-for-age is the recommended screening measure for overweight and obesity in children aged 2-19 years. 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 different for children than adults?
A: Children's body composition varies by age and sex, so BMI must be compared against growth charts specific to their age and gender.

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

Q3: When should BMI be measured in children?
A: The AAP recommends BMI screening annually for all children aged 2 years and older.

Q4: Are there limitations to BMI for children?
A: BMI doesn't distinguish between fat and muscle mass. Very muscular children may have high BMI without excess fat.

Q5: What should I do if my child's BMI is high?
A: Consult with a healthcare provider who can perform additional assessments and provide guidance.