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 kids, BMI is age- and sex-specific and is often 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

Note: For children, the raw BMI number must be plotted on a BMI-for-age growth chart to determine the percentile.

3. Importance of BMI Calculation for Kids

Details: BMI-for-age is the recommended measure for screening overweight and obesity in children aged 2-18 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 (2-18), and select gender. For accurate results, measurements should be taken with minimal clothing and no shoes.

5. Frequently Asked Questions (FAQ)

Q1: How is child BMI different from adult BMI?
A: While calculated the same way, child BMI is interpreted relative to other children of the same age and sex using percentile charts.

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

Q3: Where can I find Australian growth charts?
A: The Australian Government Department of Health provides BMI-for-age growth charts for boys and girls.

Q4: How often should my child's BMI be checked?
A: Annual checks are recommended for children over 2 years old as part of routine health assessments.

Q5: Are there limitations to BMI for children?
A: BMI doesn't distinguish between muscle and fat, so athletic children may have high BMI without excess fat. Always consult a healthcare professional for interpretation.