What's My Apple Watch Size?

To find your Apple Watch size, remove the watch from your wrist and turn it over. On the back, in the top right corner, you’ll see the case size indicated in millimeters (mm).

For "38mm / 40mm / 41mm / 42mm" selection fits: 

• 38mm Apple Watch Series 3, 2, 1
• 40mm Apple Watch Series 6, 5, 4, SE
• 41mm Apple Watch Series 9, 8, 7
• 42mm Apple Watch Series 10

For "42mm / 44mm / 45mm / 46mm / 49mm" selection fits: 

• 42mm Apple Watch Series 3, 2, 1
• 44mm Apple Watch Series 6, 5, 4, SE
• 45mm Apple Watch Series  9, 8, 7
• 49mm Apple Watch Ultra 1 & 2
• 46mm Apple Watch Series 10