How Many Photos Can I Store?

How photo storage adds up

Every photo takes up a fixed amount of space, and once you know that number you can predict exactly how many will fit. The size of a photo depends on the camera resolution and the file format:

• 12 MP (standard phone photo): about 3 to 4 MB as a JPEG.
• 48 MP (high-resolution mode): about 10 to 15 MB, and up to 25 MB with detail preserved.
• HEIF/HEIC (Apple's default): roughly half the size of JPEG, so about 1.5 to 2 MB at 12 MP.
• RAW: 25 to 50 MB per image, which is why photographers burn through cards.
• 4K video: about 350 MB per minute, so a 10-minute clip is 3.5 GB.

The calculator above takes your storage, subtracts what is already used, and divides by your average photo size to give a real photo count, plus a mixed estimate for photos and video.

Worked example: a 128 GB phone

A 128 GB phone sounds like it holds a lot of photos. Here is the honest math.

• Nominal storage: 128 GB
• Operating system and pre-installed apps: about 15 GB
• Your apps, messages and music: say 40 GB
• Free space for photos and video: 128 - 15 - 40 = 73 GB
• At 4 MB per 12 MP photo: 73 GB x 1,024 MB / 4 = about 18,700 photos

So a 128 GB phone holds about 18,000 to 19,000 standard photos, not the 32,000 you get if you divide 128,000 by 4. The missing space is the system and your own apps.

Now add video. Ten minutes of 4K video a week is 3.5 GB per week, or about 180 GB a year, more than the phone holds. A single hour of 4K footage is roughly 21 GB, which on its own eats a third of your free space. That is why how many photos and how much video are the same question, and why the calculator reports both.

Photo and video sizes at a glance

Realistic file sizes and what they mean for 73 GB of free space:

The 48 MP mode is the biggest trap: shooting at full resolution cuts your capacity to a third. Most phones default to a 12 MP pixel-binned photo that looks nearly identical at normal viewing sizes. Note also that manufacturers measure storage in gigabytes of 1,000 MB while software often reports gibibytes of 1,024, which is part of why a 128 GB phone shows as 119 GB in settings.

Why your phone shows less space than the box says

Two things shrink the number you see. First, the operating system and pre-installed apps claim 10 to 20 GB before you take a single photo. Second, there is the GB-versus-GiB confusion: storage is sold in decimal gigabytes (1 GB = 1,000,000,000 bytes) but reported by software in binary gibibytes (1 GiB = 1,073,741,824 bytes). That difference alone makes a 128 GB drive look like 119 GB.

The NIST guide to metric prefixes explains the decimal-versus-binary distinction, and the FTC business guidance covers how device storage should be described to consumers. When a manufacturer advertises a photo capacity, it is usually the best case at the smallest file size.

SD cards, cloud plans and backups

Where you store photos changes how many you can keep:

• SD cards: a 256 GB card at 4 MB per photo holds about 64,000 photos. Cards are cheap, but they fail, so never keep your only copy on one.
• Cloud plans: Google One, iCloud and Dropbox sell 100 GB, 200 GB and 2 TB tiers. A 200 GB plan holds roughly 50,000 12 MP photos.
• Backups: the 3-2-1 rule, three copies, two kinds of media, one off-site. For most people that means phone, computer and cloud.
• Video is the real space hog. One hour of 4K video equals about 5,000 photos.

The practical takeaway: if you shoot 12 MP photos and back up automatically, a 128 GB phone is fine. If you shoot 48 MP or a lot of video, size up, and the calculator above shows exactly how much more room you need.

How many photos fit on common devices

The same arithmetic scales to every device. Here is what typical storage sizes hold once you allow for the system and apps, using 4 MB per 12 MP photo:

The pattern is simple: every doubling of storage roughly doubles the photo count, because there is no overhead beyond the fixed system footprint. Moving from a 128 GB to a 256 GB phone does not double your photos, because the system uses about the same absolute space on both, but it gets close once you are past 128 GB.

If you shoot 48 MP photos, divide every number in that table by three. If you shoot HEIF, double it. And if you record video, remember that video is measured in minutes while photos are measured in thousands, so a single afternoon of 4K footage can equal a year of stills. That is why backing up video separately is worth the effort.

One practical tip: turn on optimised or high-efficiency storage in your phone's photo settings. It keeps a smaller copy on the device and the full-resolution original in the cloud, which can effectively double the number of photos your phone can show you at any one time.