Determine whether you have a small, medium or large body frame using your height-to-wrist-circumference ratio.
Body frame size — small, medium or large — describes bone structure independent of muscle or fat. It's typically estimated from the ratio of height to wrist circumference, and is useful context when interpreting ideal weight ranges or strength standards, since a larger-framed person will naturally carry more skeletal weight.
Enter values to see your results.
r = Height (cm) ÷ Wrist Circumference (cm)
r > 10.4 small · 9.6–10.4 medium · < 9.6 large
r > 11.0 small · 10.1–11.0 medium · < 10.1 large
Wrist: measured just below the wrist bone (styloid process), tape snug.
| Gender | Small Frame | Medium Frame | Large Frame |
|---|---|---|---|
| Men | r > 10.4 | 9.6 – 10.4 | r < 9.6 |
| Women | r > 11.0 | 10.1 – 11.0 | r < 10.1 |
Wrist size correlates with overall skeletal size and isn't much affected by fat or muscle mass, making it a simple proxy for frame.
This is an approximation used in fitness contexts, not a clinical measure of bone density or structure.
Not everyone with the same height has the same skeleton — frame size adds useful context to weight and strength benchmarks.
Shift a generic ideal-weight estimate up or down based on frame.
Interpret strength benchmarks relative to your skeletal size.
Frame size can inform sizing for watches, gloves and fitted gear.
Trainers use frame size alongside other measurements for a fuller client profile.
Some physique categories informally reference frame size.
A quick starting data point before deeper body-composition testing.
Height 178 cm, wrist 17.5 cm → r = 10.17 (medium frame).
Height 165 cm, wrist 14.5 cm → r = 11.38 (small frame).
Height 175 cm, wrist 19 cm → r = 9.21 (large frame).
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