1. What is BMI?

Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults. It is calculated by dividing a person's weight in kilograms by the square of their height in meters.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

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

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

3. Importance of BMI Calculation

Details: BMI is an inexpensive and easy screening method for weight category—underweight, healthy weight, overweight, and obesity. It is strongly correlated with various metabolic and disease outcomes.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For most accurate results, measure weight in the morning after using the bathroom and before eating, and measure height without shoes.

5. Frequently Asked Questions (FAQ)

Q1: What are the BMI categories?
A: For adults: 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 build, and underestimate it in older persons who have lost muscle mass.

Q3: How does BMI differ for women?
A: Women tend to have more body fat than men at the same BMI. The categories are the same, but health risks may differ.

Q4: What is a healthy BMI range for Australian women?
A: The healthy range is generally 18.5-24.9, same as international standards, though individual factors should be considered.

Q5: Should BMI be the only measure of healthy weight?
A: No, waist circumference and other factors should also be considered as BMI doesn't account for muscle mass, bone density, or fat distribution.