1. What is BMI for Children?

Body Mass Index (BMI) is a measure that adjusts body weight for height. For children, BMI is age- and sex-specific and is often referred to as BMI-for-age. The NSW Healthy Kids tool compares a child's BMI to growth charts to determine their percentile.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

The result is then compared to age- and sex-specific percentile charts to determine the child's weight status category.

3. Importance of BMI Calculation

Details: BMI-for-age is the recommended measure for screening overweight and obesity in children and teens. 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 by a health professional.

5. Frequently Asked Questions (FAQ)

Q1: Why use BMI-for-age instead of regular BMI?
A: Children's body composition varies as they grow, so BMI must be interpreted relative to other children of the same age and sex.

Q2: What do the percentile categories mean?
A: Below 5th (underweight), 5th-85th (healthy weight), 85th-95th (overweight), and above 95th (obese).

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 fat and muscle mass. Athletic children may have high BMI due to muscle rather than fat.

Q5: Where can I get more information?
A: Visit the NSW Health website or consult your child's pediatrician for personalized advice.