Understanding BMI: What It Is and How It's Calculated
Learn the fundamentals of Body Mass Index, its history, and the mathematical formula behind this widely-used health screening tool.
What is BMI?
Body Mass Index (BMI) is a numerical value derived from your height and weight. It was developed in the 1830s by Belgian mathematician Adolphe Quetelet and has become a standard screening tool for categorizing weight status in adults.
The BMI Formula
BMI is calculated using a simple formula: BMI = weight (kg) / height (m)². For imperial units, the formula is: BMI = (weight in pounds × 703) / (height in inches)². This standardized calculation allows healthcare professionals to quickly assess whether someone falls within a healthy weight range.
Why BMI Matters
BMI serves as an initial screening tool to identify potential weight-related health risks. While it doesn't measure body fat directly, research has shown correlations between BMI ranges and health outcomes, making it a useful starting point for health assessments.
Global Standards
The World Health Organization (WHO) has established international BMI categories that are widely used by healthcare systems worldwide. These categories help standardize health assessments across different populations and medical practices.