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Wrists

Lot of people don't quite realize this, but watch sizes should be proportional, and here's a nice illustration from Gentlemen's Gazette,

Ideal Dial and Lug Sizes

The Slender Wrist's excellent article, take this further with a reference table.

What I've done here is more a summary for myself and my table is a little different because my Excel formulas does not round,

InchesCentimetres

Watch Case Size
60% - 75%

Lug To Lug Distance
75% - 95%

Flat of Wrist*
5.25 "13.335 cm26.67 - 33.3375 mm26.67 - 42.2275 mm44.45 mm
5.50 ”13.97 cm27.9 - 34.925 mm34.925 - 44.23833333 mm46.56666667 mm
5.75 ”14.605 cm29.21 - 36.5125 mm36.5125 - 46.24916667 mm48.68333333 mm
6.00 ”15.2 cm30.48 - 38.1 mm38.1 - 48.26 mm50.8 mm
6.25 ”15.9 cm31.75 - 39.6875 mm39.6875 - 20.27083333 mm52.91666667 mm
6.50"16.51 cm33.02 - 41.275 mm41.275 - 52.2816666755.03333333
6.75"17.14534.29 - 42.8652 mm42.8625 - 54.292557.15
7.00"17.7835.56 - 44.0375 mm44.45 - 56.3033333359.26666667
7.25"18.41536.83 - 46.0375 mm46.0375 - 58.3141666761.38333333
7.5"19.0538.1 - 47.625 mm47.625 - 60.32563.5

Notes

The formula estimates the flat of your wrist. In some you may actually have a smaller or larger wrist than the formula and should adjust accordingly.

We use the preferred ratio case diameter of 60% to 75% of the size of the flat of wrist. Rough estimate of flat of wrist is your wrist size (in mm) and divide it by 3.

Ideal lug to lug distance is 75% to 95% of wrist width.

More Variables

Again the Slender Wrist article, "The Ultimate Watch Size Guide: Factors Influencing The Size Of A Watch" has a comprehensive discussion and these are my short notes,

Colour - white looks bigger and black looks smaller) and lug to lug distance also plays an important role here,

h

Bezels and Hour Marker Circle - The watch design also visually impacts the eye to see a watch smaller than it is,

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