Apple Watch band compatibility

The Apple Watch Series 10 is available in new 42mm and 46mm sizes, Apple says that the old watch bands will work on the new models, and vice versa.

Apple Watch Size:
Series 4, 5, 6, SE: 40mm or 44mm
Series 7, 8: 41mm or 45mm
Series 10: 42mm or 46mm
Ultra 49mm 

  • 38/40/41/42mm: compatible with 38mm, 40mm, 41mm and fits the new 42mm case.
  • 44/45/46/49mm: compatible with 44mm, 45mm, 46mm, and 49mm cases (also works with the old 42mm Series 3 size).

Information from Apple:
You can match most bands with any Apple Watch Series 3 or later case of the same size.
38-mm, 40-mm, 41-mm and 42-mm bands are compatible with 38-mm, 40-mm, 41-mm and 42-mm case sizes. 44-mm, 45-mm, 46-mm and 49-mm bands are compatible with 44-mm, 45-mm, 46-mm and 49-mm case sizes. 

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