iPhone 18 Pro Max vs iPhone 15 size
The iPhone 18 Pro Max measures 163.4 x 78 x 8.75 mm and the iPhone 15 measures 147.6 x 71.6 x 7.8 mm. The iPhone 18 Pro Max is the bigger phone. Its front covers 20.6% more area than the iPhone 15.
- iPhone 18 Pro Max249 g163.4 x 78 x 8.8 mm
- iPhone 15171 g147.6 x 71.6 x 7.8 mm
Outlines are drawn from published dimensions. Screen and camera shapes are simplified.
How the iPhone 18 Pro Max measures up
| Spec | iPhone 18 Pro Max | iPhone 15 | Difference |
|---|---|---|---|
| Height | 163.4 mm 6.43 in | 147.6 mm 5.81 in | +15.8 mm (+10.7%) |
| Width | 78 mm 3.07 in | 71.6 mm 2.82 in | +6.4 mm (+8.9%) |
| Thickness | 8.75 mm 0.34 in | 7.8 mm 0.31 in | +0.95 mm (+12.2%) |
| Weight | 249 g 8.8 oz | 171 g 6.0 oz | +78 g (+45.6%) |
| Screen | 6.9 in | 6.1 in | +0.8 in (+13.1%) |
| Front footprint | 127.5 cm² | 105.7 cm² | +21.8 cm² (+20.6%) |
What the difference feels like
The iPhone 18 Pro Max is 6.4 mm wider, an obvious difference in the hand. If you use your phone one-handed, the iPhone 15 will be easier to reach across.
In a jeans pocket the iPhone 18 Pro Max sits 15.8 mm higher, about 0.62 inches.
The iPhone 18 Pro Max is 0.95 mm thicker. Manufacturers measure thickness without the camera bump, so the real difference at the camera can be larger.
At 78 g heavier (2.8 oz), the iPhone 18 Pro Max is noticeably heftier when you hold it up to read.
Common questions
Is the iPhone 18 Pro Max bigger than the iPhone 15?
The iPhone 18 Pro Max is the bigger phone. Its front covers 20.6% more area than the iPhone 15. Height differs by 15.8 mm and width by 6.4 mm.
Will a iPhone 15 case fit the iPhone 18 Pro Max?
No. A case is cut for one model's exact size, buttons and camera, and these two differ by 15.8 mm in height and 6.4 mm in width. Buy a case made for the iPhone 18 Pro Max.
Which is easier to use with one hand?
The iPhone 15, because it is 6.4 mm narrower. Width matters more than height for reaching across the screen with your thumb.
Cases and prices
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Sources
- iPhone 18 Pro Max: manufacturer spec page
- iPhone 15: manufacturer spec page
See each phone's page for the full spec: iPhone 18 Pro Max and iPhone 15.