1. What is BMI?

Body Mass Index (BMI) is a value derived from an individual's weight and height. It provides a simple numeric measure of a person's thickness or thinness, allowing health professionals to discuss weight problems objectively with their patients.

2. How Does the Calculator Work?

The calculator uses the standard BMI formula for pounds and inches:

Where:

• \( weight \) — Body weight in pounds (lb)
• \( height \) — Height in inches (in)
• 703 — Conversion factor (kg/m²)/(lb/in²)

Explanation: The formula calculates body mass per unit of height squared, adjusted for imperial units.

3. Importance of BMI Calculation

Details: BMI is widely used as a screening tool to identify possible weight problems in adults. While not diagnostic, it can indicate whether someone may be at risk for weight-related health issues.

4. Using the Calculator

Tips: Enter weight in pounds and height in inches. For accurate results, measure weight without heavy clothing and height without shoes. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

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

Q2: Is BMI accurate for everyone?
A: BMI may overestimate body fat in athletes and underestimate it in older people with lost muscle mass.

Q3: Why use 703 in the formula?
A: This is the conversion factor needed when using pounds and inches (1 kg/m² = 703 lb/in²).

Q4: How often should I check my BMI?
A: For most adults, checking every few months is sufficient unless directed otherwise by a healthcare provider.

Q5: Should children use this calculator?
A: No, children and teens need age- and sex-specific BMI percentiles rather than adult categories.