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: The formula provides a simple numeric measure of a person's thickness or thinness.

3. Importance of BMI Calculation

Details: BMI is an inexpensive and easy screening method for weight category—underweight, healthy weight, overweight, and obesity. For New Zealand men, BMI is particularly important as obesity rates are high in the country.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

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

Q2: Are there limitations to BMI?
A: BMI doesn't distinguish between muscle and fat, so muscular individuals may have high BMI without excess fat.

Q3: Is BMI different for Māori and Pacific men?
A: While the same BMI categories apply, health risks may occur at lower BMIs for these populations.

Q4: How often should I check my BMI?
A: For most adults, checking every 6-12 months is sufficient unless actively trying to change weight.

Q5: Should BMI be the only measure of health?
A: No, waist circumference and other health markers should also be considered for a complete picture.