Galaxy S27 Pro and S27 Ultra Case: Will Your Old One Still Fit?

Galaxy S27 Pro and S27 Ultra Case: What We Already Know

Samsung is launching two large phones in early 2027: the Galaxy S27 Ultra and, for the first time, a Galaxy S27 Pro that is essentially a shrunken Ultra. For cases, this is the biggest shift in several generations. Both phones get a completely redesigned back, and the Pro introduces a body size Samsung has never used before.

This page collects everything known about the two housings and answers the question I get with every launch: does my old case still fit? Once both phones are on my desk, this page becomes the full test with real drop results and measurements.

Two Phones, Two Sizes

The most reliable source so far is a set of renders published in late August 2026 by French leaker OnLeaks. They are based on final CAD files from the supply chain, which is exactly what case manufacturers use to cut their molds. That makes this data far more dependable for accessories than rumors about chips or cameras.

The Galaxy S27 Pro is listed at 154.06 mm tall, 73.77 mm wide and 7.95 mm thick, with a display of roughly 6.6 inches. The Ultra stays at about 6.9 inches and comes in around 9 mm longer and 5 mm wider. That puts the Ultra at roughly 163 by 79 mm.

The most important difference for a case is not a measurement but a missing slot. The S27 Pro drops the S Pen silo that the Ultra keeps. Cases with a pen holder will therefore exist only for the larger model.

The New Camera Plateau Changes Everything

Both phones move to a continuous camera plateau on the back, a raised platform spanning the full width of the device instead of individual protruding lens rings. Visually it strongly resembles the design Apple introduced the year before.

For a case, this is the headline. Until now a case needed a small round cutout with a raised lip around it. Now it needs a large rectangular cutout that reaches the edges of the body, and the raised lip has to be recalculated because a plateau changes the height at which the phone rests.

Get that lip too low and the camera glass drags across every table, which is exactly where the scratches come from that later show up as a haze on your photos. Get it too high and the phone rocks when you type. That lip is the first thing I measure in every test, because in daily use it matters more than drop resistance.

Will Your Galaxy S26 Ultra Case Fit?

No, and that applies to both new models.

For the S27 Pro the answer is obvious. The phone is around 9 mm shorter and 5 mm narrower than an Ultra. An older case would leave it loose, the phone would slide out on the first drop, and the buttons and charging port would sit in completely different places.

For the S27 Ultra the size gap is smaller but the outcome is the same. Even if the outer dimensions turned out to be nearly identical, the camera cutout kills it. A case built for separate lens rings cannot sensibly frame a full-width plateau. It will either cover the lenses or leave the plateau exposed.

There is one more thing people underestimate: the openings for the volume rocker, the speakers and the USB-C port. A shift of a single millimeter is enough to make buttons hard to press or stop a charging cable from seating properly. On a tight hard case you feel it immediately.

My advice is to sell your current accessories while the S26 Ultra still has resale value. If you are staying on that phone and want to upgrade its protection, you will find everything I tested in my roundup of the cases that actually protect the Galaxy S26 Ultra.

Will an S27 Ultra Case Fit the S27 Pro?

It will not. This gets asked a lot because both phones look identical and share a generation. But 9 mm of length is an enormous gap in this category. The Pro would rattle inside an Ultra case, and the opening for the S Pen silo would sit over a flat, solid back.

The other direction does not even go on. Check the exact model name before you buy, especially with listings that lump both phones into a single product page.

Which Type of Case Suits You

Clear. Popular because you keep the phone’s color. The catch is yellowing. Pure TPU turns yellow reliably, often within a few months. Builds that combine a hard back with a soft frame stay clear far longer. I showed how big that difference gets with the Spigen Ultra Hybrid on the previous generation.

Ultra thin. Feels great and adds almost nothing, but protects almost nothing either. If you drop your phone regularly, this is the wrong category. The Slim Magnet Case for the S26 Ultra is a good example of that trade-off.

Rugged. Thick corners, reinforced edges, often a built-in stand. Not pretty, but consistently ahead in drop tests. The right pick for job sites, sports and kids.

With a magnet ring. Samsung has pushed Qi2 into the Android world, so magnetic accessories now matter here too. Check whether an actual ring is built in or whether the listing merely claims compatibility. Without a ring, no car mount and no magnetic power bank will hold.

Five Things That Separate Good Cases From Bad Ones

When the first models arrive, the market floods within days. These five points do the sorting.

A raised camera lip. At least about a millimeter above the plateau. Flush is worthless.

A raised front lip. The case has to stand proud of the screen too, otherwise the glass hits the ground first in a face-down drop.

Screen protector compatibility. If the front lip is too tall or too steep, it lifts an installed tempered glass at the edges and peels it off. That is why I always test case and glass together.

Clean button feedback. On the more compact Pro the buttons sit closer together. Poorly made cases turn volume up and down into the same mushy press.

An honest material claim. Plenty of sellers print polycarbonate on the box and ship pure TPU. You can spot it by the weight and by how far the back flexes.

When Should You Buy?

The major brands are available on launch day because they build from the same CAD files that produced the leaked renders. Pre-ordering from them carries little risk.

No-name listings are a different story. Some are produced from rumors, and if a single measurement changes late, the case does not fit. There, wait for the first buyer reports. It usually costs you only a few days.

Frequently Asked Questions

When do the phones launch?
There is no official date. Samsung traditionally unveils the S series in late January or early February, and both models are expected in early 2027.

Does my S26 Ultra case fit the S27 Ultra?
No. The new camera plateau makes the previous generation’s cutout unusable.

Does an Ultra case fit the Pro?
No. There are roughly 9 mm in length and 5 mm in width between them.

Do I need a case with a magnet ring?
Only if you use magnetic accessories. It makes no difference to protection.

What about the S Pen slot?
Only the Ultra has it, so cases with a pen holder will be Ultra only.

Who Is Testing Here?

I am Sven from the YouTube channel The Case Tester. I buy the products myself and test them on real phones. No spec sheet copying, but drop tests from several heights, a check of how precisely the cutouts line up, and long-term observation of whether clear cases turn yellow. Once the Galaxy S27 Pro and S27 Ultra are available, this page becomes the complete test.

Screen protection has its own page: Galaxy S27 Pro and Ultra screen protectors. And if you want to know whether your charger is actually delivering what your current phone can take, my free Charge Check tells you in fifteen minutes without any measuring gear.