1. What is BMI for Children?

BMI (Body Mass Index) for children is a measure that adjusts weight for height. Unlike adults, children's BMI is compared to growth charts to determine percentiles based on age and sex, as their body composition changes with growth.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

And then compares the result to CDC growth charts to determine the percentile category:

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

3. Importance of BMI Percentile

Details: BMI percentile is the most common indicator of weight status in children. It helps identify potential weight problems that may lead to health issues, while accounting for normal growth patterns.

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, age in years (2-20), and select gender. For accurate results, measurements should be taken with minimal clothing and no shoes.

5. Frequently Asked Questions (FAQ)

Q1: Why use percentiles for children instead of BMI categories?
A: Children's body fat changes with age and differs between boys and girls. Percentiles account for these normal growth patterns.

Q2: What if my child is below 2 years old?
A: This calculator is for children 2-20 years. For infants, weight-for-length percentiles should be used instead.

Q3: How often should my child's BMI be checked?
A: The American Academy of Pediatrics recommends BMI screening annually starting at age 2.

Q4: Does a high BMI percentile always mean my child is overweight?
A: Not necessarily. A healthcare provider should evaluate muscle mass, growth pattern, and other factors.

Q5: Where can I find official growth charts?
A: The CDC provides detailed growth charts at: https://www.cdc.gov/growthcharts/