1. What is BMI for Children?

BMI (Body Mass Index) for children and teens is age- and sex-specific and is often referred to as BMI-for-age. Unlike adults, children's BMI must be interpreted relative to other children of the same age and sex.

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, the BMI number alone doesn't tell the whole story. It must be plotted on a CDC BMI-for-age growth chart to determine the percentile.

3. Importance of BMI Calculation

Details: BMI-for-age is the most commonly used indicator to screen for weight problems in children aged 2-19 years. It can identify potential weight issues that may lead to health problems.

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 as they grow, and differs between boys and girls. BMI-for-age accounts for these differences.

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

Q3: When should I be concerned about my child's BMI?
A: Consult a healthcare provider if your child is below the 5th percentile or above the 85th percentile.

Q4: Are there limitations to BMI for children?
A: BMI doesn't distinguish between muscle and fat, and may not be accurate for very muscular children or those with certain medical conditions.

Q5: How often should children's BMI be checked?
A: The American Academy of Pediatrics recommends BMI screening at least annually for all children aged 2+ years.