How to Calculate & Formula Details
Mathematical Model Formula
Frame Ratio = Height (in) / Wrist Circumference (in), classified against standard male/female thresholds.Body frame size is a rough proxy for bone structure, and is often used alongside ideal weight formulas since a "healthy weight" varies by frame size - a large-framed person naturally carries more bone and muscle mass than a small-framed person of the same height.
Wrist Circumference Method
This calculator uses the height-to-wrist-circumference ratio, one of the most common non-clinical methods for estimating frame size, since wrist bone size correlates loosely with overall skeletal size.