Understanding Body Mass Index (BMI)

Our accurate BMI Calculator helps you determine if your weight is in a healthy proportion to your height. It supports both metric (cm/kg) and imperial (feet/inches/lbs) units for global accessibility.

BMI Categories & Mathematical Formula

The standard BMI formula is: Weight (kg) / [Height (m)]². The resulting number falls into specific categories defined by the World Health Organization (WHO):

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

Disclaimer: BMI is a useful screening tool but does not diagnose body fatness or health. Athletes with high muscle mass may have a high BMI without being unhealthy.