1. What is BMI for Children and Teens?

BMI (Body Mass Index) is a screening tool for overweight and obesity in children and teens aged 2-19 years. For children, BMI is age- and sex-specific and is referred to as BMI-for-age.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula adjusted for age and sex:

The result is then compared to CDC growth charts to determine the percentile for boys of the same age.

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 age in years (2-19). For accurate results, measurements should be taken by a healthcare professional.

5. Frequently Asked Questions (FAQ)

Q1: Why is BMI interpreted differently for children than adults?
A: Children's body composition varies as they grow, so BMI must be compared against growth charts specific to their age and sex.

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

Q3: Is BMI accurate for all children?
A: BMI is a screening tool, not a diagnostic. Athletic children may have higher BMI due to muscle mass, not fat.

Q4: How often should BMI be checked in children?
A: The AAP recommends BMI screening annually starting at age 2.

Q5: What if my child is above the 85th percentile?
A: Consult a healthcare provider for further evaluation and guidance on healthy growth.