1. What is Body Mass Index?

Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight, and obesity in adults. It is defined as the weight in kilograms divided by the square of the 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 reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems. It's a quick and easy method for population assessment of overweight and obesity.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What are the standard BMI categories?
A: Underweight: BMI < 18.5; Normal weight: BMI 18.5-24.9; Overweight: BMI 25-29.9; Obese: BMI ≥ 30.

Q2: Is BMI accurate for everyone?
A: BMI may not be accurate for athletes (muscle weighs more than fat), pregnant women, children, and the elderly. It's a screening tool, not a diagnostic tool.

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

Q4: What's a healthy BMI range?
A: For most adults, a BMI between 18.5 and 24.9 is considered healthy and associated with the lowest health risks.

Q5: Can BMI be used for children?
A: No, this calculator is for adults only. Children and teens need age and sex-specific BMI percentiles.