1. What is BMI for Children?

Body Mass Index (BMI) is a screening tool that estimates body fat based on height and weight measurements. For children and teens, BMI is age- and sex-specific and is often referred to as BMI-for-age.

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 compared to CDC growth charts to determine the BMI percentile for the child's age and sex.

3. Importance of BMI Calculation

Details: BMI-for-age is the recommended screening measure for overweight and obesity in children and teens. It helps identify potential weight problems that may lead to health issues.

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, and exact age in years. For accurate results, measurements should be taken with minimal clothing and no shoes.

5. Frequently Asked Questions (FAQ)

Q1: Why is BMI different for children than adults?
A: Children's body composition varies by age and sex, so BMI must be interpreted relative to other children of the same age and sex.

Q2: What are the BMI percentile categories?
A: Underweight (<5th), Healthy weight (5th-85th), Overweight (85th-95th), Obese (≥95th percentile).

Q3: When should BMI be measured in children?
A: The AAP recommends BMI screening annually from age 2, and more frequently if weight concerns exist.

Q4: Are there limitations to BMI?
A: BMI doesn't directly measure body fat and may misclassify muscular children. It's a screening tool, not a diagnostic.

Q5: What should I do if my child's BMI is high?
A: Consult a healthcare provider for further evaluation. They may assess diet, activity, family history, and other health markers.