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The iPhone 15 Plus and iPhone 18 Pro are most easily told apart by their overall size. On height, the iPhone 15 Plus measures 160.9 mm against the iPhone 18 Pro's 150.0 mm — about 10.9 mm more. On width, the iPhone 15 Plus measures 77.8 mm against the iPhone 18 Pro's 71.9 mm — about 5.9 mm more. On thickness, the iPhone 18 Pro measures 8.8 mm against the iPhone 15 Plus's 7.8 mm — about 1.0 mm more.
The iPhone 18 Pro is the heavier of the two at 211 g, compared with 201 g for the iPhone 15 Plus. That is a 10 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 Plus | iPhone 18 Pro | Diff |
|---|---|---|---|
| Width | 77.8 mm | 71.9 mm | +5.9 mm |
| Height | 160.9 mm | 150.0 mm | +10.9 mm |
| Depth | 7.8 mm | 8.8 mm | -1.0 mm |
| Weight | 201 g | 211 g | -10 g |