iPhone 18 Pro and iPhone 18 Pro Max: Official Sizes - Confirmed
Apple officially unveiled the iPhone 18 Pro and iPhone 18 Pro Max on September 9, 2026, and confirmed the exact dimensions on its tech specs pages. The numbers are now final, not leaked estimates — and the headline news for anyone with an existing case is very good.
Official screen sizes
Apple kept the same display sizes as last year:
- iPhone 18 Pro — 6.3-inch Super Retina XDR OLED display, 2622 x 1206 pixels at 460 ppi.
- iPhone 18 Pro Max — 6.9-inch Super Retina XDR OLED display, 2868 x 1320 pixels at 460 ppi.
Both use LTPO OLED panels with ProMotion up to 120Hz, and peak outdoor brightness rises to 3000 nits. Design-wise, this is an evolution rather than a reinvention: flat edges, the same wide camera plateau, and an aluminum unibody frame. The one clear visual change is a smaller Dynamic Island, thanks to Face ID components moving further under the display.
Official dimensions and weight
Here are the confirmed numbers, straight from Apple's specs page:
| Model | Dimensions (H x W x D) | Weight |
|---|---|---|
| iPhone 18 Pro | 150.0 x 71.9 x 8.75 mm | 211 g |
| iPhone 18 Pro Max | 163.4 x 78.0 x 8.75 mm | 249 g |
The thickness is identical to the iPhone 17 generation — 8.75mm for both models. Despite months of rumors that the Pro Max might get thicker to fit a larger battery, Apple kept the exact same footprint. The only real change is weight: the iPhone 18 Pro gained 5 grams (206g → 211g) and the iPhone 18 Pro Max gained 16 grams (233g → 249g), most likely from the larger battery and a redesigned vapor chamber cooling system that takes up three times more surface area than before.
Will your iPhone 17 Pro case fit the iPhone 18 Pro and Pro Max? Confirmed: yes
This is no longer a rumor-based guess — it's now a matter of matching official numbers.
iPhone 17 Pro Max and iPhone 18 Pro Max measure exactly the same: 163.4 x 78.0 x 8.75 mm. Not a fraction of a millimeter different. Apple's own technical specifications for both generations confirm identical height, width, and depth.
The same holds for the smaller Pro model — the iPhone 18 Pro carries over the same external footprint as the iPhone 17 Pro. Apple kept the Action button, volume controls, side button, Camera Control, USB-C port, and full-width camera plateau in the same positions as last year.
Practical takeaway: if you already own a well-fitting iPhone 17 Pro or iPhone 17 Pro Max case, it will fit the corresponding iPhone 18 Pro model. You do not need to buy a new case just because you're upgrading the phone.
One small caveat
Apple hasn't formally guaranteed case interchangeability, and it doesn't publish exact camera lens height or precise button coordinates. So cases with very tightly molded camera rings, built-in lens protectors, or unusually precision-cut button covers deserve a bit more caution than simple silicone or clear cases — a near-invisible manufacturing tolerance could, in rare cases, cause a slightly snug fit around the camera bump. For the vast majority of cases, though, the fit is a non-issue.
Compatibility at a glance
| Model | Fit with iPhone 17 Pro / Pro Max cases |
|---|---|
| iPhone 18 Pro | Confirmed — identical official dimensions (150.0 x 71.9 x 8.75 mm) |
| iPhone 18 Pro Max | Confirmed — identical official dimensions (163.4 x 78.0 x 8.75 mm) |
Why Apple kept the same form factor this year
Apple typically tweaks button placement, frame thickness, or camera geometry each generation — one of the quieter drivers of accessory sales. This year, Apple clearly chose to put its engineering budget into internals instead of the exterior: the new A20 Pro chip built on a 2nm process, a significantly larger vapor chamber for sustained performance (up to 40% better than the A19 Pro), and bigger batteries in both models. Keeping the chassis the same let Apple fit all of that inside an unchanged shell.
A few more things worth knowing
- Release date: Apple started taking pre-orders on September 12, 2026, with the phones shipping September 18, 2026.
- Apple also introduced its first foldable iPhone at the same event — the iPhone Duo — a separate device with its own very different dimensions (84.1 x 117.8 x 11.3 mm closed), not to be confused with the Pro or Pro Max.
- Pricing increased this cycle: the iPhone 18 Pro starts at roughly $1,399 in the US (about €1,450 in Europe), reflecting rising memory and storage chip costs that Apple has acknowledged industry-wide.
FAQ
Did the iPhone 18 Pro and Pro Max screen sizes change? No — confirmed at 6.3 inches and 6.9 inches, identical to the iPhone 17 lineup.
Is the iPhone 18 Pro Max thicker than the iPhone 17 Pro Max? No. Despite persistent rumors of a thickness increase, Apple's official specs confirm both are 8.75mm thick — exactly the same as the iPhone 17 Pro Max. Only the weight went up (233g → 249g), not the thickness.
Will my iPhone 17 Pro case fit the iPhone 18 Pro? Yes — confirmed. The official dimensions are identical (150.0 x 71.9 x 8.75 mm on both models).
Will my iPhone 17 Pro Max case fit the iPhone 18 Pro Max? Yes — confirmed. Both measure exactly 163.4 x 78.0 x 8.75 mm. The only exception to watch for is an unusually tight, precision-molded camera cutout, where a near-invisible tolerance difference could rarely cause a snugger fit.
When can I buy the new phones? Pre-orders opened September 12, 2026, with retail availability from September 18, 2026.
All dimensions, weights, and specifications in this article come from Apple's official technical specifications page, published after the September 9, 2026 keynote.
