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Free wrist size and frame type estimator: enter height and wrist circumference to compute a height-to-wrist ratio and a small/medium/large band used in many fitness references. Use alongside our body type calculator for shape context.
Last updated: April 18, 2026
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Measure wrist just below the wrist bone, where a watch would sit—snug but not tight.
Height ÷ wrist ratio
10
Medium frame
By this model, your ratio sits in the middle band—often interpreted as average skeletal breadth for your sex in chart-based systems.
Frame typing from wrist is an approximate heuristic. It does not diagnose osteoporosis or replace clinical body-composition testing.
What we compute
Same units cancel
Internally we convert to inches for both measurements so the ratio matches classic chart math.
Rule of thumb
≈ 9.25 / 10.25
Large at or below the lower ratio, small at or above the higher ratio—medium between (see formula section).
Rule of thumb
≈ 10.0 / 11.0
Charts vary by source; we document one clear midpoint set for reproducibility.
Limit
Heuristic only
Osteoporosis and bone-mineral testing require clinical tools—never infer from wrist size alone.
Planning
Fit & weight tables
Some legacy ideal-weight charts adjust for frame—use modern guidance for health targets.
Remember
FFMI is separate
Strength athletes can be lean at higher body weight—pair frame estimates with composition tools if needed.
Male, height 70 in, wrist 7 in → ratio 10 → Medium frame in this model.
We convert your height and wrist circumference to inches, compute height_in ÷ wrist_in, and compare that ratio to published-style cutoffs for men and women. This mirrors many fitness & lifestyle references that still appear in coaching handouts—while making the math explicit so you can compare tools fairly.
Male: large if ratio ≤ 9.25; small if ratio ≥ 10.25; else medium
Female: large if ratio ≤ 10.0; small if ratio ≥ 11.0; else medium
Different textbooks round differently; we chose clear boundaries and show the raw ratio so you can map to another chart if needed.
Next: compare with BMI or FFMI.
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