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The MacBook Air 15" (M3) and MacBook Pro 16" (M4 Pro/Max) are most easily told apart by their overall size. On height, the MacBook Pro 16" (M4 Pro/Max) measures 248.1 mm against the MacBook Air 15" (M3)'s 237.6 mm — about 10.5 mm more. On width, the MacBook Pro 16" (M4 Pro/Max) measures 355.7 mm against the MacBook Air 15" (M3)'s 340.4 mm — about 15.3 mm more. On thickness, the MacBook Pro 16" (M4 Pro/Max) measures 15.5 mm against the MacBook Air 15" (M3)'s 11.5 mm — about 4.0 mm more.
The MacBook Pro 16" (M4 Pro/Max) is the heavier of the two at 2.13 kg, compared with 1.26 kg for the MacBook Air 15" (M3). That is a 867 g difference (69%). In daily handling the difference is easy to feel.
| Metric | MacBook Air 15" (M3) | MacBook Pro 16" (M4 Pro/Max) | Diff |
|---|---|---|---|
| Width | 340.4 mm | 355.7 mm | -15.3 mm |
| Height | 237.6 mm | 248.1 mm | -10.5 mm |
| Depth | 11.5 mm | 15.5 mm | -4.0 mm |
| Weight | 1.26 kg | 2.13 kg | -867.0 mm |