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The iPhone 17 Pro Max and iPhone 18 Pro Max share nearly identical dimensions — the practical difference comes down to weight, materials, or other specs rather than size. They match almost exactly in height, at 163.0 mm. They match almost exactly in width, at 77.6 mm. They match almost exactly in thickness, at 8.8 mm.
The iPhone 18 Pro Max is the heavier of the two at 249 g, compared with 227 g for the iPhone 17 Pro Max. That is a 22 g difference (10%). 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 17 Pro Max | iPhone 18 Pro Max | Diff |
|---|---|---|---|
| Width | 77.6 mm | 78.0 mm | -0.4 mm |
| Height | 163.0 mm | 163.4 mm | -0.4 mm |
| Depth | 8.8 mm | 8.8 mm | 0.0 mm |
| Weight | 227 g | 249 g | -22 g |