How to estimate frame size
Use height and a wrist measurement.
1
Measure the wrist
Place the tape just below the wrist bone, without pulling it tight.
2
Enter height
Use standing height in centimetres.
3
Read the category
Compare the frame index with the thresholds for the selected sex.
What does this tool do?
The frame index divides height by wrist circumference and compares the result with sex-specific thresholds. It is a simple body-description method, not a measure of bone density.
The Formula
Frame index = height (cm) ÷ wrist circumference (cm); men: >10.4 small, 9.6–10.4 medium, <9.6 large; women: >11.0 small, 10.1–11.0 medium, <10.1 largeFrequently Asked Questions
Can frame size change with weight?
No. Bone structure is fixed in adulthood, and body fat changes wrist measurements only slightly. Weight change does not alter the underlying frame.
Where should I measure the wrist?
Measure just below the wrist bone on the dominant arm, with the tape snug but not compressing the skin.