Most ladies' watch bracelets will fit a 7 to 7.5 inch diameter wrist; most men's watch bands will fit an 8 to 8.5 inch diameter wrist. Some dive watches are even more generous, as they are designed for use while wearing a wetsuit.
To make sure you fit within these standards, use a soft tape measure to measure the circumference of your wrist. The tape should be pulled tightly around your wrist. After you have determined your wrist circumference, add 1/4 to 1/2 inch for extra comfort, depending on how lose you like to wear the watch.
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