How to check the size
Apple Watch compatible sizes and models
When choosing an Apple Watch band, the most important thing to consider is the compatible size and model. Currently, there are nine sizes for the Apple Watch, as shown below. It's important to check the size, especially if you're purchasing an Apple Watch band with an integrated case.
*If you are using the 42mm Apple Watch 10, the band sizes will be 38mm/40mm/41mm/42mm.
- Large sizes: 49mm, 46mm, 45mm, 44mm, 42mm (Series 1/2/3)
- Smaller sizes: 42mm (Series 10/11), 41mm, 40mm, 38mm
You can check the case size using the following method.
Check the markings on the back
Check the "SERIES XX ・XX MM" engraving on the back of your Apple Watch.
Check on iPhone
If you don't have an Apple Watch on hand, you can also check compatible models and sizes on your iPhone.
- Open the Apple Watch app on your iPhone
- Tap the "My Watch" tab > "General" > "About"
- Display part numbers beginning with M in "Model"
- Tap "Model" again to display a five-digit number starting with A (e.g., "A2351").
- Check the model number against the information on the official website