1. What is BMI for Children?

Body Mass Index (BMI) is a screening tool for weight categories in children and teens. For children, BMI is age- and sex-specific and is often referred to as BMI-for-age. The CDC growth charts are used to determine the corresponding BMI-for-age percentile.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

The result is then compared to CDC growth charts to determine the percentile for the child's age and gender.

3. Importance of BMI Calculation

Details: BMI-for-age is the most commonly used indicator to screen for weight problems in children and teens. It can help identify potential weight issues that may lead to health problems.

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, age in years (2-19), and select gender. All values must be valid (weight > 0, height > 0, age between 2-19).

5. Frequently Asked Questions (FAQ)

Q1: Why use BMI-for-age for children?
A: Because children's body composition varies as they grow, 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).

Q3: Is BMI accurate for all children?
A: BMI is a screening tool but doesn't directly measure body fat. Some muscular children may have a high BMI without excess fat.

Q4: How often should my child's BMI be checked?
A: The American Academy of Pediatrics recommends BMI screening at least once a year.

Q5: What if my child's BMI is high?
A: Consult with a healthcare provider who may perform further assessments to determine if excess fat is a problem.