When Finder’s folder sizes do not add up to the storage total in macOS, compare like with like before deleting anything. Check the correct disk and volume, let Finder calculate folder contents, then account for storage that Finder’s visible files do not explain—especially purgeable space, Time Machine snapshots, and macOS-managed System Data.

Start with the storage figure you are comparing

On macOS Ventura 13 or later, open Apple menu > System Settings > General > Storage. Choose All Volumes to see the breakdown for each volume and container on the internal disk. Older macOS versions place storage information under Apple menu > About This Mac > Storage. Apple explains that Storage categories group files by type, and that System Data is a changing category for items such as caches, logs, virtual memory files, and app support data. Change Storage settings on Mac

Make a note of the number you want to reconcile: the drive’s used space, its available space, or a particular storage category. These are different quantities. Also check whether Finder is showing the startup disk, another volume, or a folder on an external drive. On a disk with multiple volumes, Storage settings can report each volume and its shared container; adding volume figures as if each had a separate physical disk can confuse the comparison.

Make Finder calculate folder contents

In Finder, select a folder and choose File > Get Info. For a folder containing many nested items, Finder may take time to calculate its size; wait for the figure to finish updating. For a broader scan, open the folder in list view, choose View > Show View Options, and enable Calculate all sizes. Allow time for nested folders to populate, particularly on large or busy disks.

Now compare folders within the same scope—for example, the contents of your home folder against the home folder’s reported size. Do not expect a few visible top-level folders to account for the whole drive: other user accounts, shared files, app data, macOS files, and items in Trash can be elsewhere. Apple’s Storage categories also overlap with how people naturally browse in Finder: the Documents category, for instance, includes only certain files in your home folder, while other types are listed separately. Find and delete files on your Mac

Check available space and purgeable storage

If the discrepancy is between Finder’s file sizes and available storage, available is not simply the sum of visible files subtracted from disk capacity. Apple defines free space as physically open disk space; available space can also include purgeable caches and other space macOS can reclaim when needed. Disk Utility’s disk information may include both free and purgeable space in its available figure. Find and delete files on your Mac Get detailed information about a disk in Disk Utility on Mac

To inspect the disk, open Disk Utility, choose View > Show All Devices, then select the relevant device, container, or volume and click Info. Compare the same level in both places: a physical device, APFS container, and individual volume can show different figures. Purgeable space is managed by macOS; it is not a folder you can locate and delete in Finder.

Consider Time Machine snapshots and System Data

Time Machine can keep local snapshots on an APFS startup disk when automatic backups are enabled. These snapshots are stored on the same disk, and Apple says macOS counts their space as available and removes snapshots as they age or as storage is needed. Their contribution therefore may not match a straightforward Finder folder total. About Time Machine local snapshots

If you need to inspect snapshots, Disk Utility offers View > Show APFS Snapshots. The list can help identify that snapshots exist, but it does not turn them into ordinary Finder files. Avoid deleting snapshots simply to make two numbers match; Apple says macOS manages their removal as space is needed. View APFS snapshots in Disk Utility on Mac

System Data is another reason no single Finder folder will match a Storage category. Apple says it includes system-managed and temporary resources and varies with the Mac’s current state. Storage settings do not let you select and delete that category directly. If you suspect a particular app is using space, inspect its own storage controls or the relevant user files instead of removing unfamiliar system files.

A practical reconciliation sequence

  1. In Storage settings, select All Volumes and identify the disk or volume whose figure you are investigating.
  2. In Finder, calculate sizes for folders on that same volume, including other user and shared folders if relevant.
  3. Check Trash, remembering that deleted items continue to occupy space until Trash is emptied. Empty it only if you intend to remove those files.
  4. If the remaining difference concerns available space, review Disk Utility’s free and purgeable figures and consider Time Machine snapshots.
  5. Reopen Storage settings after changes and allow its category totals to update. Apple says this information updates as you free space. Free up storage space on Mac

A mismatch is often a difference in scope or accounting: Finder totals visible files, while macOS storage views also describe categories, shared volumes, and space that can be reclaimed. If the numbers remain far apart after checking those factors, note the macOS version, the exact volume, and the specific figures; those details make further troubleshooting more precise.

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