Short answer: A iPhone 18 case will not properly fit the Galaxy S27 Ultra — the cutouts and camera plateau don't line up. These are completely different phones — a compact flat-edge iPhone versus a large S Pen-equipped Ultra — so cases never cross over. If you want guaranteed protection and precise cutouts, buy a case built for your exact model — Buy the case built for whichever phone you carry; there is no shared shell.
Heads-up: The iPhone 18 and Galaxy S27 Ultra is still expected/rumored at the time of writing, so dimensions here are based on the best available leaks and prior-generation trends. Final retail photos pending — we update fitment guidance the moment verified measurements land.
Quick Take (TL;DR)
- These are completely different phones — a compact flat-edge iPhone versus a large S Pen-equipped Ultra — so cases never cross over.
- A iPhone 18 case will not properly fit the Galaxy S27 Ultra — the cutouts and camera plateau don't line up.
- Best move: match the case to the exact phone. Buy the case built for whichever phone you carry; there is no shared shell.
- Gorilla Cases stocks model-specific covers with raised camera lips, MIL-STD-810G drop protection and precise port cutouts.
Will a iPhone 18 case fit the Galaxy S27 Ultra?
A iPhone 18 case will not properly fit the Galaxy S27 Ultra — the cutouts and camera plateau don't line up. The two phones share a similar footprint, but case fitment is decided by millimetres, not general size. Even a 1–2 mm shift in the camera housing or a repositioned button leaves a cutout misaligned — blocking the flash or burying the mute switch. These are completely different phones — a compact flat-edge iPhone versus a large S Pen-equipped Ultra — so cases never cross over. That alone is enough to make a shared case feel wrong, so we recommend buying the case built for your exact model.
What changed between the iPhone 18 and Galaxy S27 Ultra?
The iPhone 18 measures roughly ≈147.6 x 71.5 x 7.8 mm (expected), while the Galaxy S27 Ultra comes in at about ≈163.4 x 78 x 8.2 mm (expected). Those tenths of a millimetre decide whether the phone snaps in cleanly or fights the frame. Button placement, antenna lines and the USB-C port can also shift between generations, and any one of those changes which cutouts a case needs. Wireless-charging and magnetic-accessory alignment matter too: if the magnet ring moves even slightly, an older case can weaken MagSafe-style snap or push the phone off-centre on a pad.
Which Gorilla Case should you buy for the Galaxy S27 Ultra?
For everyday carry, a slim rugged case with a raised camera lip and MIL-STD-810G drop rating covers most people; work outdoors or near water and you'll want a waterproof or full-body armour design, while camera-first users should pick a dedicated camera-cover case. Every Gorilla Case below is moulded to the exact model, so cutouts line up on the first try — raised bezels keep the screen and lenses off flat surfaces, and reinforced corners absorb the energy of a face-down drop. Look for a genuine MIL-STD-810G rating and, for water resistance, IP68-style sealing.
iPhone 18 vs Galaxy S27 Ultra: Specs & Case-Fit at a Glance
| Feature | iPhone 18 | Galaxy S27 Ultra |
|---|---|---|
| Approx. dimensions | ≈147.6 x 71.5 x 7.8 mm (expected) | ≈163.4 x 78 x 8.2 mm (expected) |
| Case cross-compatibility | Reference model | A iPhone 18 case will not properly fit the Galaxy S27 Ultra — the cutouts and camera plateau don't line up |
| Camera cutout | Model-specific | Model-specific (re-aligned) |
| Recommended case | Model-matched | Model-matched |
| Drop standard | MIL-STD-810G | MIL-STD-810G |
| Water option | Available | Available |
Shop iPhone 18 and Galaxy Ultra Cases
This is a cross-brand matchup, so protection comes down to model-matched engineering. Both phones get MIL-STD-810G and waterproof options — just pick the right shell.
Browse the full iPhone collection →
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The Verdict
If you're deciding between reusing a iPhone 18 case or buying fresh for the Galaxy S27 Ultra, the honest answer is to buy the case made for the phone in your hand. A iPhone 18 case will not properly fit the Galaxy S27 Ultra — the cutouts and camera plateau don't line up. A near-fit leaves gaps in exactly the places — corners, camera, ports — where you most need coverage.
Buy the case built for whichever phone you carry; there is no shared shell. Browse the model-matched options below, and if you're unsure which variant you own, our team will confirm it before you order.
Frequently Asked Questions
Is the Galaxy S27 Ultra the same size as the iPhone 18?
Not exactly. The iPhone 18 is about ≈147.6 x 71.5 x 7.8 mm (expected) and the Galaxy S27 Ultra is about ≈163.4 x 78 x 8.2 mm (expected). These are completely different phones — a compact flat-edge iPhone versus a large S Pen-equipped Ultra — so cases never cross over.
Can I use my old iPhone 18 case on the Galaxy S27 Ultra?
A iPhone 18 case will not properly fit the Galaxy S27 Ultra — the cutouts and camera plateau don't line up.
Do Gorilla Cases for the Galaxy S27 Ultra have a raised camera lip?
Yes — every model-specific case has a raised bezel around the lenses and screen so both stay off flat surfaces in a drop.
Are these cases MIL-STD-810G drop rated?
The rugged, metal and waterproof lines carry a MIL-STD-810G drop rating; slim and clear styles add corner protection at a lower profile.
Will a case block wireless or MagSafe-style charging on the Galaxy S27 Ultra?
No. The cases pass through wireless and magnetic charging, and magnetic versions add an aligned ring for a stronger snap.
Is there a waterproof case for the Galaxy S27 Ultra?
Yes — a full-body waterproof design with a built-in screen membrane is available for water and dust protection.
How do I confirm my exact Galaxy S27 Ultra model?
Check Settings → About phone for the model number, or call us at 978-797-0223 and we'll identify it before you buy.
Do you ship Galaxy S27 Ultra cases with tracking?
Yes, every order ships with tracked delivery so you can follow it to your door.
Questions about fitment before you buy? Reach the Gorilla Cases team via our Contact page or call 978-797-0223 — we will confirm the right case for your exact model. Every order ships with tracked delivery and our fit guarantee.