How to Calculate BMI: A Complete Guide

Understanding Body Mass Index

Body Mass Index (BMI) is a measure of body fat based on height and weight. It's a simple screening tool that can help identify potential weight problems in adults.

The BMI Formula

BMI is calculated using the formula: BMI = weight (kg) / height (m)²

For imperial units: BMI = (weight (lbs) / height (in)²) × 703

BMI Categories

• Underweight: BMI less than 18.5
• Normal weight: BMI 18.5 - 24.9
• Overweight: BMI 25 - 29.9
• Obese: BMI 30 or greater

Why BMI Matters

BMI is used as a screening tool to identify potential health risks. A healthy BMI can reduce the risk of chronic diseases like heart disease, diabetes, and certain cancers.

Limitations of BMI

While BMI is useful, it has limitations. It doesn't account for muscle mass, bone density, or overall body composition. Athletes may have a high BMI despite being fit.