Method 1: Back of Apple Watch

To find your case size and more information, check the engraving on the back of your Apple Watch.

Method 2: Watch App on iPhone

Start by opening the "Watch" app on your iPhone

Select "All Watches" on the top left of your screen once in the app:

You can then verify the case / watch size of your Apple Watch:

Find Your Perfect Fit: Just Select the Appropriate Size.

Select "49mm" if your Apple Watch is:

• 49mm Apple Watch Ultra /Ultra 2/ Ultra 3

Or select "46mm / 45mm / 44mm  " if your Apple Watch is:

• 46mm Apple Watch Series 10,11
• 45mm Apple Watch Series 7, 8, 9
• 44mm Apple Watch Series 6, 5, 4 or SE
• 42mm Apple Watch Series 3, 2, or 1

Or select "42mm / 41mm / 40mm" if your Apple Watch is:

• 42mm Apple Watch Series 10,11
• 41mm Apple Watch Series 7, 8, 9
• 40mm Apple Watch Series 6, 5, 4 or SE
• 38mm Apple Watch Series 3, 2, or 1