Apple Watch Series 10 (46mm) vs Apple Watch Ultra 3: Size & Dimensions

The Apple Watch Series 10 (46mm) and Apple Watch Ultra 3 are most easily told apart by their overall size. On height, the Apple Watch Ultra 3 measures 49.0 mm against the Apple Watch Series 10 (46mm)'s 46.0 mm — about 3.0 mm more. On width, the Apple Watch Ultra 3 measures 44.0 mm against the Apple Watch Series 10 (46mm)'s 39.4 mm — about 4.6 mm more. On thickness, the Apple Watch Ultra 3 measures 14.4 mm against the Apple Watch Series 10 (46mm)'s 9.7 mm — about 4.7 mm more.

The Apple Watch Ultra 3 is the heavier of the two at 61.4 g, compared with 34.2 g for the Apple Watch Series 10 (46mm). That is a 27.199999999999996 g difference (80%). In daily handling the difference is easy to feel.