Apple measures the vertical length of the face of the watch. The difference in case size means a difference in display size. The 38mm Apple Watch has a display size of 340x272 pixels while the 42mm Apple Watch has a display size of 390x312 pixels. More pixels translate to bigger text and images.
Apple Watch Series 3 GPS, 42mm Space Gray Aluminum Case with Black Sport Band - Apple.
Apple Watch 42mm (1st gen)
|Watches||Width of strap (With BandClip adapter)|
|Apple Watch SE 40mm||22mm|
|Apple Watch Series 1, 2 & 3 42mm||24mm|
|Apple Watch Series 1, 2 & 3 38mm||22mm|
|Apple Watch 1st generation 42mm||24mm|
The 42 mm watch has a height of 1.67” (42.5 mm), width of 1.43” (36.4 mm), depth of . 45” (11.4 mm), and weighs 1.86 oz (52.8 g). The screen size is 1.566” (40 mm) diagonal with a resolution of 312 x 390 px at 326 ppi.
Best watch size for the wrist
|8.3 inch||39 mm||47 mm|
|8.7 inch||40 mm||48 mm|
|9.1 inch||41 mm||48 mm|
|9.5 inch||42 mm||49 mm|
<34mm Small (women's) 34mm – 38mm Midsize (unisex) 39mm – 42mm Standard (men's) 43mm – 46mm XL/Oversize (men's)
From $399 or $16.62/mo. for 24 mo.* From $699 or $29.12/mo. for 24 mo.*
The Series 4 comes in 44mm and 40mm versions, compared to the 42mm and 38mm variants we've seen in past models.
Display Size and Resolution According to Yahoo's David Pogue, the 38mm Watch will include a 1.5-inch display while the larger 42mm version ships with a 1.7-inch.
Rounding the numbers, 42MM is 1.65 inches, and 38MM is 1.5 inches.
Apple Watch 42mm Space Gray Aluminum 7000 Series.