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 gender-specific and is interpreted using percentile charts rather than fixed categories used for adults.

2. How is BMI Calculated?

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Measured in kilograms (kg)
• \( height \) — Measured in meters (m)

Note: For children, the raw BMI number must be plotted on NZ-specific growth charts to determine the percentile.

3. Importance of BMI for Children

Details: Tracking BMI percentiles helps identify potential weight problems in children. High BMI may indicate overweight/obesity, while low BMI may indicate undernutrition.

4. Using the Calculator

Tips:

• Measure weight in light clothing without shoes
• Measure height standing straight without shoes
• Use accurate measurements for best results
• Consult a healthcare provider for interpretation

5. Frequently Asked Questions (FAQ)

Q1: What BMI percentile is considered healthy?
A: Generally, 5th-85th percentile is considered healthy weight, but consult NZ growth charts for exact ranges.

Q2: Where can I find NZ BMI percentile charts?
A: The NZ Ministry of Health provides growth charts for healthcare professionals.

Q3: Why is BMI different for children than adults?
A: Children's body composition changes with growth, so age and gender must be considered.

Q4: Does BMI account for muscle mass?
A: No, BMI doesn't distinguish between muscle and fat. Athletic children may have high BMI without excess fat.

Q5: How often should children's BMI be checked?
A: Annual checks are typical, but your healthcare provider may recommend more frequent monitoring.