Watch Sizing Guide Note: Sizes may vary depending on screen resolution. For accurate sizing, please print this page at 100%. 24 mm 28 mm 32 mm 36 mm 40 mm 44 mm .9 in 1.1 in 1.3 in 1.4 in 1.6 in 1.7 in 6 mm 10 mm 48 mm 52 mm 56 mm 1.9 in 2 in 2.2 in 12 mm 15 mm Case Size Case size is an important factor in the watch style. On average, men's watches have a case width or diameter of at least 35 millimeters, which is just under 1.4 inches. Women's watches typically have a case width or diameter of less than 34 millimeters; however, watches are trending towards larger case sizes for both men and women. Case Thickness The thickness measurement refers to the width between the case back and the top of the crystal.