1. What is BMI?

Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to children, teens, and adults. 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:

For children and teens, the BMI number is plotted on the CDC BMI-for-age growth charts to determine the corresponding BMI-for-age percentile.

3. Importance of BMI Calculation for Children

Details: BMI-for-age is the recommended measure for screening overweight and obesity in children aged 2-19 years. It helps identify potential weight problems that may lead to health issues.

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, age in years (2-19), and select gender. 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 as they grow, and differs between boys and girls. BMI-for-age accounts for these differences.

Q2: What is a healthy BMI for my child?
A: Healthy BMI ranges change with age. Generally: Underweight (<5th percentile), Healthy weight (5th-85th percentile), Overweight (85th-95th percentile), Obese (≥95th percentile).

Q3: How often should my child's BMI be checked?
A: The American Academy of Pediatrics recommends BMI screening annually for all children aged 2+ years.

Q4: Are there limitations to BMI for children?
A: BMI doesn't distinguish between muscle and fat, and may not accurately reflect body fat in very muscular children or those with certain medical conditions.

Q5: What should I do if my child's BMI is high?
A: Consult your pediatrician. They may assess diet, physical activity, family history, and possibly recommend additional tests.