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The MacBook Air 13" (M4) and MacBook Air 15" (M3) are most easily told apart by their overall size. On height, the MacBook Air 15" (M3) measures 237.6 mm against the MacBook Air 13" (M4)'s 215.0 mm — about 22.6 mm more. On width, the MacBook Air 15" (M3) measures 340.4 mm against the MacBook Air 13" (M4)'s 304.1 mm — about 36.3 mm more. They match almost exactly in thickness, at 11.5 mm.
The MacBook Air 15" (M3) is the heavier of the two at 1.51 kg, compared with 1.23 kg for the MacBook Air 13" (M4). That is a 280 g difference (23%). In daily handling the difference is easy to feel.
| Metric | MacBook Air 13" (M4) | MacBook Air 15" (M3) | Diff |
|---|---|---|---|
| Width | 304.1 mm | 340.4 mm | -36.3 mm |
| Height | 215.0 mm | 237.6 mm | -22.6 mm |
| Depth | 11.5 mm | 11.5 mm | 0.0 mm |
| Weight | 1.23 kg | 1.51 kg | -280 g |