1. What is BMI for Children?

Body Mass Index (BMI) is a measure of body fat based on height and weight. For children, BMI is age- and sex-specific and is referred to as BMI-for-age. Growth charts show the weight status categories used with children and teens (underweight, healthy weight, overweight, obese).

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

For children, the BMI value is plotted on CDC growth charts to determine the corresponding percentile.

3. Importance of BMI Percentiles

Details: BMI percentiles are the most commonly used indicator to assess the size and growth patterns of children. Percentiles show how a child's measurements compare with others the same gender and age.

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, age in years (2-20), and select gender. Click "Print Growth Chart" to generate a printable version of CDC growth charts with your child's BMI plotted.

5. Frequently Asked Questions (FAQ)

Q1: What do the percentile ranges mean?
A: Underweight (<5th), Healthy weight (5th-85th), Overweight (85th-95th), Obese (≥95th).

Q2: Why use percentiles for children?
A: Children's body composition varies as they grow, so BMI must be interpreted relative to other children of the same age and sex.

Q3: How often should BMI be calculated for children?
A: At least annually, or more frequently if weight concerns exist.

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 official growth charts?
A: CDC growth charts are available at: https://www.cdc.gov/growthcharts/