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My mathematical Watch Sizing guide!

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wrist size
125K views 215 replies 151 participants last post by  Spiffy 
Makes sense to me. Let's assume the human wrist is approximately an ellipse with major axis say twice the minor axis (ie twice as wide as thick.)Then assume that the watch diameter is approx the same as the width of the wrist (major axis). Then if you work out the circumference of the ellipse you'll find that the ratio of circumference to major axis is approx. 5. You'd probably want the ratio to be less than that as you don't want the watch to overhang your wrist.
 
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