To make buying process easier especially when buying a watch online, where you do not have the luxury to try on a watch, we have created a simple watch size chart guide for you. Please print out the guide at 100% to view these watches sizes with the correct proportions. Check that the guide is printed correctly by measuring the case width in (mm) with a ruler (44mm = 4.4 cm) Additionally, if you are buying a watch for yourself, it is advisable to draw out the size of a watch on a piece of paper to quickly size it to your wrist. General mens watch sizes range from 34mm-50mm, and general ladies watch sizes range from 22mm-45mm. If you are looking to purchase a watch as a gift and are completely unsure about what size to get, you can go with general safe sizes 41mm-45mm for a man, and 34mm-38mm for a woman.