1. What is Body Mass Index (BMI)?

BMI is a value derived from the mass (weight) and height of a person. It provides a simple numeric measure of a person's thickness or thinness, allowing health professionals to discuss weight problems more objectively with their patients.

2. How Does the Calculator Work?

The calculator uses the BMI formula:

Where:

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

Explanation: The BMI is calculated by dividing the weight by the square of the height. This provides a standardized measure that can be compared across individuals of different heights.

3. Importance of BMI Calculation

Details: BMI is widely used as a screening tool to identify possible weight problems in adults. While it doesn't measure body fat directly, research has shown that BMI correlates to direct measures of body fat.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. All values must be valid (weight > 0, height > 0). For most accurate results, measure weight in the morning before eating and after using the toilet.

5. Frequently Asked Questions (FAQ)

Q1: What are the standard BMI categories?
A: Underweight (<18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obesity (≥30).

Q2: Is BMI accurate for everyone?
A: BMI may overestimate body fat in athletes and those with muscular builds, and underestimate body fat in older persons who have lost muscle mass.

Q3: Should BMI be interpreted the same way for children?
A: No, children's BMI is age and sex-specific and is referred to as BMI-for-age.

Q4: What are the limitations of BMI?
A: BMI doesn't distinguish between muscle and fat mass, doesn't consider fat distribution, and may not be accurate for certain ethnic groups.

Q5: What should I do if my BMI is outside the normal range?
A: Consult with a healthcare professional who can perform additional assessments and provide personalized advice.