Watches come in a variety of sizes with current trends leading to bigger and thicker styles. Most of the watches listed our site are accompanied by dimensions (in mm) in the product details areas of their description. Use these dimensions and this convenient Case Size Guide to determine the size of the watch you are looking at. You will want to print this Adobe PDF at a 100% scale. This guide can alse be helpful for Square and Tonneau (barrel) shaped watches as well. Click on the image below for a full-sized printable version of our Watch Case Sizing Guide.