1. What is BMI?

Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, normal weight, 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: 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 a useful screening tool to identify possible weight problems in adults. However, it is not a diagnostic tool and should be used in conjunction with other assessments.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For most accurate results, measure weight without heavy clothing and measure height without shoes.

5. Frequently Asked Questions (FAQ)

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

Q2: Is BMI accurate for everyone?
A: BMI may not be accurate for athletes (who may have high muscle mass), pregnant women, or the elderly (who may have lost muscle mass).

Q3: How often should I check my BMI?
A: For most adults, checking BMI once or twice a year is sufficient unless you're actively trying to lose or gain weight.

Q4: Does BMI apply to children?
A: Children's BMI is calculated differently, using percentiles based on age and sex rather than fixed categories.

Q5: Where can I get more information about healthy weight?
A: The Australian Government Department of Health website provides comprehensive information about healthy weight ranges and lifestyle.