1. What is 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 meters squared. It's used by the Australian Heart Foundation as a screening tool for weight categories.

2. How Does the Calculator Work?

The calculator uses the standard BMI equation:

Where:

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

Explanation: 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.

3. Importance of BMI Calculation

Details: BMI is an inexpensive and easy screening method for weight category—underweight, healthy weight, overweight, and obesity. The Australian Heart Foundation uses BMI as one indicator of cardiovascular risk.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What are the BMI categories according to the Australian Heart Foundation?
A: Underweight (<18.5), Healthy weight (18.5-24.9), Overweight (25-29.9), Obese (≥30).

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

Q3: Why does the Heart Foundation use BMI?
A: Higher BMI is associated with increased risk of heart disease, high blood pressure, type 2 diabetes and other conditions.

Q4: Should I just rely on BMI?
A: No, BMI should be considered along with other measures like waist circumference and overall health assessment.

Q5: How often should I check my BMI?
A: For most adults, checking every 6-12 months is sufficient unless you're actively trying to change your weight.