How Much iPhone Storage Do I Need?

How much iPhone storage you need depends on how much photo and video you keep on the phone, and whether iCloud Photos holds the originals. The iPhone 17 starts at 256GB. Shooting ProRAW or long 4K recordings, or keeping the whole library on the phone without iCloud Photos, points to 512GB or more.

Not all of the capacity is yours to fill. Apple's specifications say a standard configuration, including iOS, uses approximately 12GB to 24GB. The figure changes with software version, settings and model.

How to Work Out the iPhone Storage You Need

The phone you have now is the best evidence for the next one. Four steps on it give a figure to buy against:

1. Open Settings, tap General, then tap iPhone Storage.
2. Note how much of the capacity is in use. That is the used figure.
3. Find Photos in the list of apps and note the space it uses.
4. Compare the used figure with the capacity you are considering, and leave room for the years you will keep the phone.

As an example, a 256GB phone with 180 GB in use has 76 GB left. If Photos is most of the 180 GB and the library keeps growing, the same capacity will fill again. A 256GB phone with 60 GB in use has room to stay at that size. Each part of the screen is explained in how to check iPhone storage.

The used figure is only half of the comparison. The other half is which capacities the next phone comes in.

Storage Sizes on Current iPhones

As of October 2026, the iPhone 17 comes in 256GB and 512GB. The iPhone 17 Pro Max comes in 256GB, 512GB, 1TB and 2TB. Older models also came in smaller sizes: the iPhone 12 came in 64GB and 128GB as well as 256GB. Those sizes still turn up on used and refurbished phones.

Is 128GB enough for an iPhone?

128GB is enough for an iPhone that keeps a small library on the device, with iCloud Photos on and little video. Neither the iPhone 17 nor the iPhone 17 Pro Max offers 128GB, so the question applies to an older or used phone.

On every capacity, the 12GB to 24GB taken by a standard configuration comes off the top. A 256GB phone never has the full 256GB free for photos.

What Fills iPhone Storage: Photos, Video and ProRAW

For a camera roll, the camera's format settings decide how much each photo and video costs. Apple's HEIF and HEVC page says High Efficiency formats use less storage than JPEG and H.264. Switching to Most Compatible in Settings, Camera, Formats makes new photos and videos larger.

Apple ProRAW files are much larger again. Apple gives these sizes for one photo:

At about 75 MB each, 1,000 ProRAW photos at 48 MP take about 75 GB. That is over a quarter of a 256GB phone. ProRAW is a Pro model feature, so the cost applies to buyers of those models.

Video follows the same format rule, with HEVC using less storage than H.264. The iPhone 17 Pro Max records 4K Dolby Vision at up to 120 fps. Apple lists its ProRes recording, up to 4K at 120 fps, "with external recording", so footage recorded that way does not land on the phone.

Growth only matters if the library has to sit on the phone, and iCloud Photos decides that.

How iCloud Photos Changes the Storage You Need

iCloud Photos reduces the iPhone storage you need only when the originals live in iCloud. Apple's page on photo and video storage says that with Optimize iPhone Storage on, full-resolution photos and videos are stored in iCloud. Space-saving copies stay on the phone when space is needed.

Apple says Optimize Storage is on by default when you use iCloud Photos. Without iCloud Photos, every photo and video stays on the phone in its original size, and the phone's capacity has to hold the whole library.

The library then has to fit in iCloud instead. iCloud comes with 5 GB free, and iCloud+ adds plans of 50 GB, 200 GB, 2 TB, 6 TB and 12 TB. The two kinds of space are compared in iPhone storage vs iCloud storage.

Which iPhone Storage Size to Choose

Is 256GB enough for an iPhone?

256GB is enough for an iPhone whose used figure today sits well under 256 GB. It is also enough when the library lives in iCloud with Optimize iPhone Storage on. It runs short sooner with ProRAW or long 4K recordings kept on the phone.

Each capacity suits a set of conditions, built from Apple's file sizes and the iCloud setting. Check them against your own used figure, as a starting point rather than a rule:

Buying More Storage or Keeping the Library Smaller

A larger capacity fills the same way over time. Camera rolls collect screenshots, near-identical shots and clips nobody watches again. Clearing those is part of freeing up space on iPhone, and it can keep a library within a smaller size.

Clearing them by hand means deciding photo by photo. Apps built for that decision show one photo at a time and delete only what you confirm. Apps such as Swipe Quick do this on the device: swipe left to delete, swipe right to keep. Deleted photos go to Recently Deleted for 30 days.