BMI Calculator Guide: Understanding Your Body Mass Index

BMI (Body Mass Index) is a measure that uses your height and weight to determine if you are at a healthy weight. It is calculated by dividing weight in kilograms by height in meters squared (kg/m²). BMI is widely used because it is simple, non-invasive, and provides a quick screening tool for weight categories. However, it is not a diagnostic tool and should be used alongside other health assessments.

The World Health Organization (WHO) defines BMI categories as: • Underweight: Below 18.5 (increased risk of nutritional deficiency) • Normal weight: 18.5 – 24.9 (lowest health risk) • Overweight: 25.0 – 29.9 (increased risk of chronic diseases) • Obese Class I: 30.0 – 34.9 (moderate health risk) • Obese Class II: 35.0 – 39.9 (high health risk) • Obese Class III: 40.0 and above (very high health risk)

BMI has several limitations: • Does not distinguish between muscle and fat mass • May misclassify athletes and bodybuilders as overweight • May not be accurate for older adults or pregnant women • Does not account for fat distribution • May not be suitable for certain ethnic groups For these reasons, BMI should be used as a screening tool, not a diagnostic tool.