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The iPhone 15 Pro Max and iPhone 18 Pro Max are most easily told apart by their overall size. On height, the iPhone 18 Pro Max measures 163.4 mm against the iPhone 15 Pro Max's 159.9 mm — about 3.5 mm more. On width, the iPhone 18 Pro Max measures 78.0 mm against the iPhone 15 Pro Max's 76.7 mm — about 1.3 mm more. On thickness, the iPhone 18 Pro Max measures 8.8 mm against the iPhone 15 Pro Max's 8.3 mm — about 0.5 mm more.
The iPhone 18 Pro Max is the heavier of the two at 233 g, compared with 221 g for the iPhone 15 Pro Max. That is a 12 g difference (5%). The gap is small enough that you would barely notice it day to day.
Fits in most pockets, may feel snug when sitting.
Most of the screen is reachable, shifting grip needed for corners.
Fits in most pockets, may feel snug when sitting.
Most of the screen is reachable, shifting grip needed for corners.
| Metric | iPhone 15 Pro Max | iPhone 18 Pro Max | Diff |
|---|---|---|---|
| Width | 76.7 mm | 78.0 mm | -1.3 mm |
| Height | 159.9 mm | 163.4 mm | -3.5 mm |
| Depth | 8.3 mm | 8.8 mm | -0.5 mm |
| Weight | 221 g | 233 g | -12 g |