1. What is Body Mass Index (BMI)?

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in metres squared. BMI 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:

• \( weight_{kg} \) — Weight in kilograms (kg)
• \( height_{m} \) — Height in metres (m)

Explanation: The formula calculates body mass index by dividing weight in kilograms by the square of height in metres.

3. Importance of BMI Calculation

Details: BMI is widely used in Australia as a screening tool to identify possible weight problems in adults. However, it should be considered a rough guide because it may not correspond to the same degree of fatness in different individuals.

4. Using the Calculator

Tips: Enter weight in kilograms and height in metres. For accurate results, measure height without shoes and weight with minimal clothing. All values must be valid (weight > 0, height > 0).

5. Frequently Asked Questions (FAQ)

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

Q2: Is BMI accurate for everyone?
A: BMI may not be accurate for athletes (muscle weighs more than fat), pregnant women, children, and the elderly.

Q3: What is a healthy BMI range?
A: For most adults, a BMI between 18.5 and 24.9 is considered healthy according to Australian health guidelines.

Q4: How often should I check my BMI?
A: Regular monitoring every 3-6 months is recommended if you're working on weight management, otherwise annually is sufficient.

Q5: Where can I get more information about healthy weight in Australia?
A: Visit the Australian Government Department of Health website or consult with your healthcare provider for personalized advice.