1. What is BMI for Children?

Body Mass Index (BMI) for children is a measure that adjusts for age and gender, unlike adult BMI. It compares a child's weight and height to growth charts to determine their BMI percentile.

2. How BMI is Calculated for Kids

The calculator uses the standard BMI formula adjusted for pediatric growth charts:

This value is then plotted on CDC/NHS growth charts to determine the child's percentile.

3. Understanding BMI Percentiles

Interpretation:

• Underweight: Less than 5th percentile
• Healthy weight: 5th to less than 85th percentile
• Overweight: 85th to less than 95th percentile
• Obese: 95th percentile or higher

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, age in years (2-18), and gender. For accurate results, measurements should be recent.

5. Frequently Asked Questions (FAQ)

Q1: Why use BMI percentiles for children?
A: Children's body composition changes with growth, so percentiles account for normal variations by age and gender.

Q2: How often should my child's BMI be checked?
A: The NHS recommends annual checks from age 2, or more frequently if weight concerns exist.

Q3: What if my child is very muscular?
A: BMI may overestimate fat in muscular children. Additional assessments may be needed.

Q4: Are there differences between CDC and NHS charts?
A: Both use similar methodology but may show slight variations in percentiles.

Q5: What should I do if my child's BMI is concerning?
A: Consult your GP or pediatrician for personalized advice and potential further evaluation.