Body Frame Calculator

Body frame size classifies the thickness and density of your skeletal structure. Recognizing whether you have a small, medium, or large skeleton helps you set more realistic weight goals, since bones and joints naturally vary in weight.

Wrap a flexible measuring tape around your wrist just below the bony knuckle (the side closer to your hand). The tape should fit snugly against your skin without pinching or squeezing.

You can use the 'finger test'. Wrap your thumb and index finger around your opposite wrist. If they overlap, you likely have a small frame. If they just touch, you likely have a medium frame. If they don't touch, you likely have a large frame.

No. Your skeleton size is determined by genetics and bone growth. Losing weight or gaining muscle changes your body fat and muscle volume, but your underlying bone dimensions remain the same.

Standard BMI calculations do not account for skeletal frame size, which is one of their main limitations. A person with a large frame may have a higher BMI and still be completely healthy, as they carry more skeletal and muscle mass.