1. What is BMI?

Body Mass Index (BMI) is a simple calculation using a person's height and weight. It provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

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

Explanation: BMI is calculated by dividing weight in kilograms by the square of height in meters.

3. Importance of BMI Calculation

Details: BMI is a simple, inexpensive screening method for weight category—underweight, healthy weight, overweight, and obesity. It helps assess risk for diseases that can occur with more 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 elderly men with legs, the same BMI ranges apply as for general population.

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 elderly men?
A: BMI can be less accurate in elderly due to changes in body composition, but remains a useful screening tool when interpreted with clinical judgment.

Q3: How should height be measured?
A: Stand straight against a wall without shoes, with heels together, looking straight ahead. Measure to the nearest centimeter.

Q4: Are there limitations to BMI?
A: BMI doesn't distinguish between muscle and fat mass, so muscular individuals may have high BMI without excess fat.

Q5: Should BMI be interpreted differently for elderly?
A: Some evidence suggests slightly higher BMI ranges may be optimal for elderly (23-27), but consult healthcare provider for individual assessment.