1. What is BMI for Children?

BMI (Body Mass Index) for children is calculated the same way as for adults, but the results are interpreted differently. For children, BMI is age and gender-specific and is compared to growth charts to determine a percentile ranking.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Body weight in kilograms
• \( height \) — Height in meters

Explanation: The result is then compared to CDC/NHS growth charts to determine the child's BMI percentile for their age and gender.

3. Importance of BMI Calculation

Details: BMI for children helps identify potential weight problems that could lead to health issues. Percentiles show how a child's BMI compares to others of the same age and gender.

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 do the percentiles mean?
A: Below 5th percentile = underweight; 5th-85th = healthy weight; 85th-95th = overweight; Above 95th = obese.

Q2: Why is BMI different for children?
A: Children's body composition changes as they grow, so BMI must be interpreted relative to other children of the same age and gender.

Q3: How accurate is BMI for children?
A: BMI is a good screening tool but doesn't directly measure body fat. Athletic children may have high BMI due to muscle mass.

Q4: When should I be concerned about my child's BMI?
A: Consult a healthcare provider if your child is below 5th percentile or above 85th percentile consistently.

Q5: Can I use this for infants?
A: No, this calculator is for children aged 2-18 years. Different growth charts are used for infants.