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, resulting from mass in kilograms and height in metres.

2. How Does the Calculator Work?

The calculator uses the BMI formula for pounds and inches:

Where:

• \( weight \) — Weight in pounds (lbs)
• \( height \) — Height in inches (in)
• 703 — Conversion factor (kg/m² to lbs/in²)

Explanation: The formula calculates body mass index using weight in pounds and height in inches, with 703 being the conversion factor from metric to imperial units.

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 pounds and height in inches. All values must be valid (weight > 0, height > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy BMI range?
A: For adults, BMI ranges are: Underweight (<18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obesity (≥30).

Q2: Does BMI apply to everyone?
A: BMI may not be accurate for athletes (high muscle mass), pregnant women, children, and the elderly.

Q3: How do I convert kg to pounds?
A: Multiply kilograms by 2.20462 to get pounds (1 kg = 2.20462 lbs).

Q4: How do I convert cm to inches?
A: Multiply centimeters by 0.393701 to get inches (1 cm = 0.393701 in).

Q5: What is the BMI for 30kg?
A: To calculate BMI for 30kg, you need height. For example, 30kg at 140cm (55.12in) is BMI = (30×2.20462×703)/(55.12×55.12) = 15.9.