1. What is BMI?

Definition: Body Mass Index (BMI) is a value derived from the mass (weight) and height of a person. The BMI is defined as the body mass divided by the square of the body height.

Purpose: 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.

2. How Does the BMI Calculator Work?

The calculator uses the formula:

Where:

• \( BMI \) — Body Mass Index (kg/m²)
• \( W \) — Weight (kilograms)
• \( H \) — Height (meters)

Explanation: Your weight in kilograms is divided by the square of your height in meters to calculate your BMI.

3. BMI Categories

Details: According to the American Cancer Society:

• Underweight: BMI less than 18.5
• Normal weight: BMI 18.5 to 24.9
• Overweight: BMI 25 to 29.9
• Obesity: BMI 30 or greater

4. Using the Calculator

Tips: Enter your weight in kilograms and height in meters. All values must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is BMI important for cancer risk?
A: Higher BMI is associated with increased risk of several types of cancer, including breast, colon, and kidney cancers.

Q2: Is BMI accurate for everyone?
A: BMI may overestimate body fat in athletes and underestimate it in older persons who have lost muscle mass.

Q3: How often should I check my BMI?
A: Regular monitoring (every few months) can help track changes in body composition.

Q4: What's a healthy BMI range?
A: For most adults, a BMI between 18.5 and 24.9 is considered healthy.

Q5: Where can I learn more about BMI and cancer risk?
A: Visit the American Cancer Society website for more information.