1. What is BMI for Children?

BMI (Body Mass Index) for children is a measure that adjusts weight for height and compares it to growth charts for children of the same age and sex. Unlike adults, children's BMI is interpreted relative to percentiles.

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, this raw BMI value should then be plotted on age- and sex-specific growth charts to determine the percentile.

3. Importance of BMI Calculation

Details: BMI is an important screening tool for identifying potential weight problems in children. It helps identify underweight, healthy weight, overweight, and obesity.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For most 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 their BMI must be compared to growth charts specific to their demographic.

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

Q3: At what age should children start having BMI calculated?
A: BMI should be calculated annually starting at age 2 as part of routine growth monitoring.

Q4: Are there limitations to BMI for children?
A: BMI doesn't distinguish between fat and muscle mass, so athletic children may show higher values without excess fat.

Q5: Where can I find growth charts to interpret the BMI?
A: CDC growth charts are commonly used and available on their website for boys and girls aged 2-20 years.