When choosing a watch size, it's important to consider the proportion of the watch and your wrist size. A general rule of thumb is that the watch shouldn’ overlap your wrist’s top width or appear too small.
One way to determine the appropriate size is to measure the circumference of your wrist and choose a watch with a case diameter that falls within 40 to 50 percent of your measurement. Another thing to consider is the case thickness, as thick watches may not sit comfortably on a small wrist.