BMI Guide: Calculate Healthy Body Mass Index by Age and Gender

Body Mass Index (BMI) serves as a key indicator of cardiovascular health and general wellness. Learn how to calculate BMI for athletes, children, and amputees, and understand what your results mean.

Mid section of a woman measuring waist in fitness studio

What Is a Dangerously Low BMI?

Your body mass index, or BMI, depends on your weight and height, and gives you a general idea of whether you're at risk for an obesity-related illness. The BMI helps doctors quickly screen for serious issues with body weight, such as being underweight or overweight.

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