How To Measure Watch Band Length. (all lengths are approximate, some styles may vary) how to calculate watchband length place your watch on. (all lengths are approximate, some styles may vary) how to calculate watchband length:
2 piece watch bands are measured by the width of the strap end that attaches to your watch. Additionally, the reading won’t be accurate unless your wrist’s circumference is exactly or close to 6 inches.
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Alternatively, a piece of string can be used. Determine the band size measure distance between the lugs (the area where your strap fits into the case).