1. What is BMI for Boys?

BMI-for-age is the measure of body fat based on a boy's weight and height relative to his age. 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 BMI formula:

Where:

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

Explanation: The result is compared against age- and sex-specific percentiles to determine weight status category.

3. Importance of BMI Calculation

Details: BMI-for-age is the most common screening tool to identify potential weight problems in children and teens. It helps identify underweight, healthy weight, overweight, and obesity.

4. Using the Calculator

Tips: Enter weight in kilograms, height in meters, and age in years (2-20 years). All values must be valid (weight > 0, height > 0, age between 2-20).

5. Frequently Asked Questions (FAQ)

Q1: Why is BMI different for children than adults?
A: Children's body composition varies as they grow, so BMI must be interpreted relative to other children of the same age and sex.

Q2: What are the BMI categories for boys?
A: Underweight (<5th percentile), Healthy weight (5th-85th percentile), Overweight (85th-95th percentile), Obese (≥95th percentile).

Q3: When should BMI be measured?
A: Pediatricians typically measure BMI at annual checkups starting at age 2.

Q4: Are there limitations to BMI?
A: BMI doesn't distinguish between fat and muscle mass. Athletic children may have high BMI due to muscle rather than fat.

Q5: What if my child's BMI is high?
A: Consult a pediatrician who can perform additional assessments and consider growth patterns over time.