1. What is BMI?

BMI (Body Mass Index) 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 weight in kilograms by the square of 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)

BMI Categories:

• Underweight: BMI < 18.5
• Normal weight: BMI 18.5-24.9
• Overweight: BMI 25-29.9
• Obesity: BMI ≥ 30

3. Importance of BMI Calculation

Details: 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. According to the American Cancer Society, maintaining a healthy BMI can reduce cancer risk.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For height in feet/inches or weight in pounds, convert to metric units first (1 kg = 2.2 lbs, 1 m = 3.28 ft).

5. Frequently Asked Questions (FAQ)

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

Q2: What are the limitations of BMI?
A: BMI doesn't distinguish between muscle and fat, so athletes may have high BMI without excess fat. It also doesn't account for fat distribution.

Q3: Is BMI different for children?
A: Yes, BMI for children is age and sex-specific and expressed as a percentile.

Q4: What's a healthy BMI range according to ACS?
A: The American Cancer Society recommends maintaining a BMI between 18.5 and 24.9 for optimal health.

Q5: How often should I check my BMI?
A: For most adults, checking BMI annually is sufficient unless actively trying to lose or gain weight.