1. What is BMI?

Definition: Body Mass Index (BMI) is a value derived from the mass (weight) and height of a person.

Purpose: The BMI is a simple, inexpensive screening method for weight category—underweight, healthy weight, overweight, and obesity.

2. How Does the BMI Calculator Work?

The calculator uses the formula:

Where:

• \( BMI \) — Body Mass Index (kg/m²)
• \( W \) — Weight (kilograms)
• \( H \) — Height (meters)

Explanation: The weight in kilograms is divided by the square of height in meters.

3. Importance of BMI Calculation

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

4. Using the Calculator

Tips: Enter your weight in kilograms and height in meters. All values must be > 0.

5. BMI Categories

• Underweight: BMI less than 18.5
• Normal weight: BMI 18.5-24.9
• Overweight: BMI 25-29.9
• Obesity: BMI 30 or greater

6. Frequently Asked Questions (FAQ)

Q1: Is BMI accurate for everyone?
A: BMI may not be accurate for athletes (high muscle mass), pregnant women, children, or the elderly.

Q2: How do I convert pounds to kilograms?
A: 1 pound = 0.453592 kilograms. Multiply pounds by 0.453592 to get kilograms.

Q3: How do I convert feet/inches to meters?
A: 1 foot = 0.3048 meters, 1 inch = 0.0254 meters. For example, 5'7" = (5×0.3048) + (7×0.0254) = 1.7018 meters.

Q4: What are the limitations of BMI?
A: BMI doesn't distinguish between muscle and fat, and doesn't account for fat distribution.

Q5: Should children use the same BMI categories?
A: No, children's BMI is age and sex-specific and should be compared against growth charts.