1. What is BMI?

Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, normal weight, overweight and obesity in adults and children.

2. How Does the Calculator Work?

The calculator uses the BMI formula:

Where:

• \( weight \) — Body weight in kilograms
• \( height \) — Height in meters

Explanation: BMI provides a simple numeric measure of a person's thickness or thinness, allowing health professionals to discuss weight problems objectively with their patients.

3. Importance of BMI Calculation

Details: BMI is an inexpensive and easy screening method for weight category—underweight, healthy weight, overweight, and obesity. It correlates moderately well with direct measures of body fatness.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. All values must be valid (weight > 0, height > 0). For boys, the interpretation of BMI is age-specific.

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy BMI range for boys?
A: Healthy BMI ranges for boys vary by age. Pediatricians use growth charts that show BMI as a percentile based on age and sex.

Q2: Why is BMI different for children than adults?
A: Children's body composition varies as they grow, and differs between boys and girls. Therefore, BMI for children is age- and sex-specific.

Q3: What are the limitations of BMI?
A: BMI doesn't directly measure body fat and doesn't account for muscle mass, bone density, overall body composition, and racial/ethnic differences.

Q4: How often should BMI be calculated for boys?
A: Pediatricians typically calculate BMI at least once a year during well-child visits to monitor growth patterns.

Q5: What should I do if my child's BMI is high?
A: Consult with a pediatrician who can evaluate growth trends, diet, physical activity, and family history to determine if any action is needed.