1. What is BMI for Children?

BMI (Body Mass Index) for children is a measure that adjusts weight for height and compares it to growth charts for children of the same age and sex. Unlike adults, children's BMI is interpreted using percentiles rather than fixed categories.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

The result is then compared to CDC/WHO growth charts to determine the percentile based on age and gender.

3. Understanding BMI Percentiles

Percentile Categories:

• Underweight: <5th percentile
• Healthy weight: 5th to <85th percentile
• Overweight: 85th to <95th percentile
• Obese: ≥95th percentile

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, and exact age in years (2-19 years). For accurate results, measurements should be taken with minimal clothing and no shoes.

5. Frequently Asked Questions (FAQ)

Q1: Why use percentiles for children instead of BMI categories?
A: Children's body composition varies with age and sex, so percentiles account for normal growth patterns.

Q2: How often should my child's BMI be checked?
A: Annual BMI screening is recommended for children aged 2 years and older.

Q3: What if my child's BMI percentile changes significantly?
A: Consult a pediatrician if there's a large percentile change, as it may indicate growth issues.

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 and WHO provide detailed growth charts on their websites for different age groups.