About the BMI Calculator

Body Mass Index (BMI) is a widely used screening tool to assess whether a person has a healthy body weight relative to their height. It is calculated by dividing weight in kilograms by height in meters squared (BMI = kg/m²). For imperial units, the formula is BMI = (weight in lbs × 703) / (height in inches)². While BMI does not directly measure body fat, it correlates with more direct measures of body fat and is a useful initial screening tool.

The World Health Organization (WHO) classifies BMI into four categories: Underweight (below 18.5), Normal weight (18.5 to 24.9), Overweight (25.0 to 29.9), and Obese (30.0 and above). These categories are associated with different health risk levels. However, BMI has limitations — it does not distinguish between muscle and fat mass, and may not be accurate for athletes, elderly individuals, or people with certain body types.

This tool supports both metric and imperial units for your convenience. Always consult a healthcare professional for a comprehensive health assessment beyond BMI alone.