A key iPhone 18 Pro Max measurement rumor just got revised downward from 8.8mm to 8.75mm, matching the iPhone 17 Pro Max exactly. The change comes with no explanation, while other major claims—battery capacity between 5,100 and 5,200 mAh and a weight over 240
By the time the rumor mill was ready to treat 8.8mm as settled, the number changed—quietly, without a rationale.
Today, Weibo leaker Ice Universe revised the expected iPhone 18 Pro Max thickness from 8.8mm to 8.75mm, matching it exactly to the iPhone 17 Pro Max. AppleInsider reported the update. The leaker did not explain why the figure was adjusted.
Other high-stakes claims that helped build the “thicker Pro Max” narrative were not revised. Digital Chat Station’s battery estimate still sits in the 5. 100–5. 200 mAh range. and Instant Digital’s weight claim still points to a device exceeding 240 grams. according to Trusted Reviews. The 6.9-inch display footprint is also expected to stay unchanged.
The revision matters because the thickness number is the one detail that just moved. The capacity and weight numbers that were paired with it haven’t.
The story leading up to today’s adjustment stretches back months. Last November. Instant Digital claimed the iPhone 18 Pro Max would be slightly thicker than its predecessor and could weigh over 240 grams—potentially making it the heaviest iPhone since the iPhone 14 Pro Max. MacRumors reported that claim three months ago.
Then Ice Universe supplied a specific thickness number three months ago: 8.8mm, up from 8.75mm on the iPhone 17 Pro Max. MacRumors described Ice Universe as an “oft-accurate” leaker, and the 8.8mm figure spread quickly as the working expectation.
Digital Chat Station followed with a battery rationale. Trusted Reviews reported three months ago that a battery in the 5. 100–5. 200 mAh range was expected. up from the 5. 088 mAh cell in the eSIM version of the iPhone 17 Pro Max. In early April. the MacRumors Show tied the thread together: a slightly thicker chassis. a bigger battery. and a heavier phone.
But the confidence was already softening before today. Two months ago, MacRumors noted that any thickness increase might be too small to show up on physical dummy units, a quiet warning that the 8.8mm figure could be under pressure heading into June.
The difference between 8.8mm and 8.75mm is 0.05mm. No hand or pocket comparison would register that. Still. the new number carries the uncomfortable weight of inconsistency: the person who set the earlier thickness claim stepped back to match the iPhone 17 Pro Max. yet the battery and weight claims that once traveled with it stayed put.
Ice Universe’s update appeared today with no explanation for the change, AppleInsider reported. Supply-chain leaks typically don’t come with changelogs. What caused the revision—whether a different production sample. a measurement methodology shift. or updated specs from further down the supply chain—remains unknown.
Digital Chat Station’s battery estimate remains 5,100–5,200 mAh, compared to 5,088 mAh in the current model, per Trusted Reviews. That’s an increase of up to roughly 112 mAh, even as the chassis is now rumored to match the iPhone 17 Pro Max’s thickness.
The weight rumor also remains unrevised. Instant Digital’s claim that the iPhone 18 Pro Max would exceed 240 grams is still floating, according to MacRumors and Trusted Reviews, and it was originally part of the same case for a thicker chassis. The thickness changed; the other numbers didn’t.
On the outside, the updated picture doesn’t add up to a visible shift. Based on current leaks, the 6.9-inch display footprint is expected to stay the same, per Trusted Reviews. With the revised 8.75mm thickness, the iPhone 18 Pro Max would also match the iPhone 17 Pro Max exactly.
For context, the iPhone 16 Pro Max measured 8.25mm, according to AppleInsider, suggesting the Pro Max line has already moved up in thickness across recent generations.
The more meaningful changes, according to leaks, are expected to be internal. The iPhone 18 Pro lineup is reported to include a smaller Dynamic Island. Apple’s in-house C2 modem. a simplified Camera Control system. and a main camera with variable aperture. per the MacRumors Show. Those kinds of changes can consume engineering effort without necessarily changing the outer dimensions.
In the same post that revised the thickness figure. Ice Universe claimed Apple directed its “attention and energy” toward the iPhone Ultra this cycle. AppleInsider reported today. It is a plausible explanation for a static Pro Max chassis. but it comes from the same uncorroborated post that delivered the revised thickness number—and no independent confirmation has followed.
For buyers, that split between “what you can see” and “what you can’t” is where the pressure lands. A thickness gap on its own has little effect on day-to-day decisions. The real question is whether any meaningful battery upgrade is actually coming.
If Digital Chat Station’s estimate proves right. a jump of 100-plus mAh of capacity inside a shell that doesn’t appear to change would be a genuine improvement for people who already feel comfortable with the Pro Max size. But if the capacity increase doesn’t show up in confirmed specs, the whole premise weakens.
A phone that matches its predecessor in thickness. display size. and weight—without a confirmed capacity boost—would look more like a maintenance release on the hardware front. The rumored camera. modem. and Dynamic Island changes would still matter to people upgrading from older iPhones. but anyone already on an iPhone 17 Pro Max would face a much narrower set of hardware reasons to move.
The weight rumor complicates that calculus. A device that may exceed 240 grams—potentially the heaviest iPhone since the iPhone 14 Pro Max. per Trusted Reviews—alongside a battery increase of around 100 mAh. raises a simple question the current evidence doesn’t answer: where would the extra weight come from?. As it stands, the rumors don’t provide an explanation.
The open questions now sit where the impact is highest. The thickness number that dominated iPhone 18 Pro Max coverage for the past three months has been walked back by the person who put it forward. with no explanation. The new 8.75mm figure deserves the same skepticism as the 8.8mm claim it replaced.
What remains most consequential—and unverified—is the battery estimate of 5. 100–5. 200 mAh and the weight claim exceeding 240 grams. per Trusted Reviews. Those claims haven’t moved across multiple rounds of revision from other sources. which could be a sign of reliability—or simply the absence of updated information.
As the launch window approaches, the signals to watch are clear: regulatory filings confirming actual battery capacity, dummy unit measurements from case manufacturers, and independent corroboration on both battery and weight figures from sources beyond Ice Universe.
The iPhone 18 Pro Max and iPhone 18 Pro are expected to launch later this year as part of Apple’s annual refresh. per Trusted Reviews. Until more concrete evidence arrives. the most honest read is that the outside dimensions may be unchanged from last year’s Pro Max—while the changes below the surface are still waiting for confirmation.
iPhone 18 Pro Max iPhone 17 Pro Max Ice Universe thickness 8.75mm battery 5 100–5 200 mAh weight over 240 grams Dynamic Island C2 modem Camera Control variable aperture
8.75mm sounds basically the same as 8.8mm lol like who even cares
So they’re making it thinner but still saying it’s gonna be over 240 grams? That’s weird physics. Like how is that possible… unless the rumor was fake to begin with.
I saw somewhere it was like 9mm?? now it’s 8.75. Leakers just be changing numbers for fun. Also matching the iPhone 17 Pro Max makes it feel like they aren’t really upgrading anything.
Thickness rumor slipping down by 0.05mm isn’t gonna be noticeable. But I don’t get why they didn’t revise the battery/weight stuff too… feels like Apple’s gonna “quietly” fix everything later or this is all recycled info anyway. 240 grams still seems high too, my case would be useless.