1. What is BMI for Children?

BMI (Body Mass Index) for children is calculated the same way as for adults, but the interpretation is different. For children, BMI is age- and sex-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:

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

3. Importance of BMI Percentiles

Details: BMI percentiles are the most commonly used indicator to assess the size and growth patterns of children in the United States. They allow comparison with children of the same sex and age.

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 percentiles for children instead of BMI categories?
A: Children's body composition varies as they grow, so percentiles account for normal differences in BMI at different ages.

Q2: What do the percentiles mean?
A: Underweight (<5th), Healthy weight (5th-85th), Overweight (85th-95th), Obese (≥95th).

Q3: How often should children's BMI be checked?
A: The American Academy of Pediatrics recommends BMI screening annually from age 2.

Q4: Are there limitations to BMI for children?
A: BMI doesn't distinguish between fat and muscle mass. Athletic children may have high BMI without excess fat.

Q5: Where can I find the CDC growth charts?
A: CDC growth charts are available on the CDC website for clinical reference.