How is frame size determined?

It divides your height by your wrist circumference to get a ratio (r). For women, r above 11 is a small frame, 10.1 to 11 is medium, and below 10.1 is large. For men the thresholds are 10.4 and 9.6.

Why does frame size matter?

Frame size helps interpret ideal-weight ranges and BMI. Two people of the same height can have healthy weights that differ because one has a larger bone structure.

Where do I measure my wrist?

Wrap a tape measure around the wrist of your dominant hand just below the wrist bone, toward the hand, where the wrist naturally bends.

Body Frame Size Calculator

Body frame size calculator

Enter your height and wrist circumference to find out whether you have a small, medium or large frame. The tool uses the standard height-to-wrist ratio method, with separate thresholds for men and women.

Knowing your frame size helps interpret ideal-weight ranges, since bone structure affects what a healthy weight looks like at a given height. Results are estimates for general guidance, not medical advice, and are calculated privately in your browser.