1. What is BMI?

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

2. How Does the Calculator Work?

The calculator uses the standard BMI formula adapted for pounds and centimeters:

Where:

• \( weight_{lbs} \) — Weight in pounds (lbs)
• \( height_{cm} \) — Height in centimeters (cm)
• 703 — Conversion factor
• 2.54 — Centimeters to inches conversion

Explanation: The formula converts height from cm to inches (by dividing by 2.54), squares this value, then divides the weight (after applying the conversion factor) by this squared height.

3. Importance of BMI Calculation

Details: BMI is widely used as a screening tool to identify possible weight problems in adults. While it doesn't measure body fat directly, research has shown that BMI correlates to direct measures of body fat.

4. Using the Calculator

Tips: Enter weight in pounds and height in centimeters. For accurate results, measure height without shoes and weight with minimal clothing.

5. Frequently Asked Questions (FAQ)

Q1: What is a healthy BMI range?
A: For adults, 18.5-24.9 is considered normal weight, 25-29.9 overweight, and 30+ obese. Below 18.5 is underweight.

Q2: Are there limitations to BMI?
A: Yes. BMI doesn't account for muscle mass, bone density, overall body composition, or racial/ethnic differences.

Q3: Is BMI calculation different for children?
A: Yes. For children and teens, BMI is age- and sex-specific and is referred to as BMI-for-age.

Q4: Why use this formula instead of kg/m²?
A: This version accommodates those who prefer using pounds and centimeters rather than kilograms and meters.

Q5: How often should I check my BMI?
A: For most adults, checking every few months is sufficient unless you're actively trying to change your weight.