1. What is BMI?

Body Mass Index (BMI) is a person's weight in kilograms divided by the square of height in meters. BMI is an inexpensive and easy screening method for weight category—underweight, healthy weight, overweight, and obesity.

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 relates weight to height squared to provide a standardized measure of body fatness.

3. Importance of BMI Calculation

Details: BMI is a reliable indicator of body fatness for most people. It is used to screen for weight categories that may lead to health problems.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. All values must be valid (weight > 0, height > 0).

5. Frequently Asked Questions (FAQ)

Q1: What are the BMI categories for adults?
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 overestimate body fat in athletes and underestimate it in older persons who have lost muscle mass.

Q3: What are the health risks of high BMI?
A: Higher BMI is associated with increased risk of heart disease, high blood pressure, type 2 diabetes, and certain cancers.

Q4: Should children use this calculator?
A: No, children and teens need age- and sex-specific BMI calculations.

Q5: What's a healthy BMI range?
A: For most adults, 18.5 to 24.9 is considered healthy.