1. What is BMI?

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

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 an inexpensive and easy screening method for weight category—underweight, healthy weight, overweight, and obesity. It's particularly relevant for men in Australia and Sydney where obesity rates are significant.

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 BMI categories for adults?
A: Underweight (<18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obesity (≥30).

Q2: Is BMI different for men and women?
A: The same BMI values apply to both men and women, though men tend to have more muscle mass which can affect interpretation.

Q3: How does BMI apply specifically to Australian men?
A: Australian men have higher average BMI than many other countries, with about 75% classified as overweight or obese.

Q4: What are limitations of BMI?
A: BMI doesn't distinguish between muscle and fat mass, so muscular individuals may be misclassified as overweight.

Q5: Should athletes use BMI?
A: Athletes with high muscle mass may need additional measurements like waist circumference or body fat percentage.