31/03/2026
The iPhone 18 Pro Max is shaping up to be the most physically substantial iPhone to date, with early leaks pointing to a chassis thickness of approximately 8.8 mm. While the increase over the projected 8.75 mm thickness of the iPhone 17 Pro Max appears marginal on paper, it signals a continued trend toward prioritizing internal hardware advancements over ultra-slim industrial design.ple's Thickest iPhone Yet at 8.8mm
According to supply chain sources and well-known leakers, the added thickness is largely attributed to meaningful internal upgrades. Chief among these is a significantly larger battery, with capacity estimates ranging between 5,100 mAh and 5,200 mAh-marking a notable jump for Apple's flagship lineup. In³ mm parallel, the device is rumored to introduce a variable aperture main camera system, a feature that typically requires additional mechanical components and internal space. These combined changes are also expected to impact overall weight, with projections suggesting the device could exceed 240 grams, potentially reaching around 243 grams. If accurate, this would make it the heaviest iPhone ever released, surpassing the iPhone 14 Pro Max.
From a historical perspective, the increasing thickness aligns with Apple's broader hardware trajectory. Over successive generations, Pro Max models have gradually become thicker to accommodate larger batteries and more advanced imaging systems. For reference, the iPhone 11 Pro Max measured 8.1 mm, followed by a slimmer 7.4 mm on the iPhone 12 Pro Max. Thickness then trended upward again with the iPhone 13 Pro Max at 7.65 mm, the iPhone 14 Pro Max at 7.85 mm, and the iPhone 15 Pro Max and iPhone 16 Pro Max both at 8.25 mm. The iPhone 17 Pro Max is expected to push that further to 8.75 mm, setting the stage for the iPhone 18 Pro Max to take the lead.
It's also important to contextualize these figures against real- world usage. Official thickness measurements account only for the main body of the device and exclude the camera module. When factoring in the increasingly prominent camera bump, driven by larger sensors and more complex optics-total thickness on recent models can exceed 13 mm. This highlights a key design trade-off in Apple's Pro lineup: incremental gains in imaging and battery performance are coming at the cost of added bulk, a compromise that appears set to continue with the next generation.
