1. What is BMI?

Body Mass Index (BMI) is a value derived from the mass and height of a person. The BMI is defined as the body mass divided by the square of the body height, and is expressed in units of kg/m².

2. How Does the Calculator Work?

The calculator uses the BMI formula:

Where:

• \( weight \) — Body weight in kilograms (kg)
• \( height \) — Height in meters (m)

Explanation: The equation calculates body mass index by dividing weight by the square of height.

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.

4. Using the Calculator

Tips: Enter weight in kg, height in meters, age in years, and select frame size. All values must be valid (weight > 0, height > 0, age between 18-120).

5. Frequently Asked Questions (FAQ)

Q1: What are the BMI categories?
A: Underweight (<18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obesity (≥30).

Q2: How does age affect BMI interpretation?
A: For older adults, the healthy BMI range may be slightly higher than for younger adults.

Q3: How does frame size affect BMI?
A: People with larger frames may have higher BMI without excess fat, while those with small frames may have lower BMI.

Q4: Are there limitations to BMI?
A: BMI doesn't distinguish between muscle and fat, so athletes may have high BMI without being overweight.

Q5: Is BMI different for women?
A: The same BMI ranges apply to both genders, but women typically have more body fat than men at the same BMI.