1. What is BMI?

Body Mass Index (BMI) is a value derived from the mass (weight) 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 meters.

2. How Does the Calculator Work?

The calculator uses the BMI formula:

Where:

• \( weight \) — Weight in pounds (lbs)
• \( height \) — Height in inches (in)
• 703 — Conversion factor to adjust for pounds and inches

Explanation: The formula calculates body mass index by dividing weight by the square of height, with a conversion factor to account for using pounds and inches instead of kilograms and meters.

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). The calculator will provide both the BMI value and the corresponding weight category.

5. Frequently Asked Questions (FAQ)

Q1: What are the BMI categories?
A: Underweight (BMI < 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 those with muscular build, and underestimate it in older persons who have lost muscle mass.

Q3: What's a healthy BMI range?
A: For most adults, a BMI between 18.5 and 24.9 is considered healthy.

Q4: Should BMI be used alone to assess health?
A: No, BMI should be used as a screening tool but not diagnostic. Waist circumference and other factors should also be considered.

Q5: Why is the formula different for pounds/inches vs kg/meters?
A: The 703 conversion factor adjusts for the different units (1 kg = 2.2 lbs, 1 m = 39.37 inches).