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The Apple Watch Series 11 (45mm) 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 11 (45mm)'s 47.0 mm — about 2.0 mm more. On width, the Apple Watch Ultra 3 measures 44.0 mm against the Apple Watch Series 11 (45mm)'s 39.6 mm — about 4.4 mm more. On thickness, the Apple Watch Ultra 3 measures 14.4 mm against the Apple Watch Series 11 (45mm)'s 10.8 mm — about 3.6 mm more.
The Apple Watch Ultra 3 is the heavier of the two at 61.4 g, compared with 39 g for the Apple Watch Series 11 (45mm). That is a 22.4 g difference (57%). In daily handling the difference is easy to feel.
| Metric | Apple Watch Series 11 (45mm) | Apple Watch Ultra 3 | Diff |
|---|---|---|---|
| Width | 39.6 mm | 44.0 mm | -4.4 mm |
| Height | 47.0 mm | 49.0 mm | -2.0 mm |
| Depth | 10.8 mm | 14.4 mm | -3.6 mm |
| Weight | 39 g | 61.4 g | -22.4 mm |