1. What is BMI?

Body Mass Index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. It is widely used in New Zealand healthcare as a screening tool to identify potential weight problems.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

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

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 important health indicator used to screen for weight categories that may lead to health problems. In New Zealand, it helps identify individuals at risk of obesity-related conditions like diabetes, heart disease, and certain cancers.

4. Using the Calculator

Tips: Enter your weight in kilograms and height in meters. 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 New Zealand?
A: Underweight (<18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obese (≥30).

Q2: Is BMI accurate for everyone?
A: BMI may not be accurate for athletes (high muscle mass), elderly (muscle loss), pregnant women, and certain ethnic groups.

Q3: How often should I check my BMI?
A: For most adults, checking every 6-12 months is sufficient unless you're actively trying to lose or gain weight.

Q4: What if my BMI is outside the normal range?
A: Consult with a healthcare professional who can assess your overall health and provide personalized advice.

Q5: Are there other measures besides BMI?
A: Yes, waist circumference and body fat percentage provide additional information about health risks.