1. What is BMI for Children?

BMI (Body Mass Index) for children is calculated the same way as for adults, but the interpretation is age- and sex-specific. It compares a child's weight to their height and shows how their BMI compares with other children of the same age and gender.

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 gender-specific growth charts to determine the percentile.

3. Importance of BMI Calculation

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: What is a healthy BMI for children?
A: Unlike adults, children's BMI is interpreted using percentiles based on age and sex. Generally:

• Underweight: <5th percentile
• Healthy weight: 5th to <85th percentile
• Overweight: 85th to <95th percentile
• Obese: ≥95th percentile

Q2: Why is BMI different for children?
A: Children's body composition varies by age and sex as they grow, so their BMI must be compared to others of the same age and sex.

Q3: How often should children's BMI be checked?
A: The NHS recommends measuring children's height and weight annually as part of the National Child Measurement Programme (NCMP).

Q4: 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. It should be used alongside other assessments.

Q5: Where can I plot my child's BMI percentile?
A: The NHS provides growth charts and percentile calculators on their website for healthcare professionals and parents.