Find your storage information in Windows Settings or File Explorer

Your PC shows how much storage you have used and how much remains in two places: Windows Settings (the quickest route) or File Explorer (which also shows you what's taking up space). Both take less than a minute. On Windows 11, open Settings, select System, then Storage — you'll see your total capacity and what percentage is in use. On Windows 10, the path is Settings > System > Storage. If you use a Mac, click the Apple menu, select About This Mac, then the Storage tab.

The number you see is your total capacity — the maximum your drive can hold. Below that, Windows breaks down what's using space: system files, apps, documents, photos, videos, and other data. If you're running low, this breakdown tells you where to focus when you need to free up room.

Key Takeaways

  • Windows Settings shows your total storage and what percentage is in use in under a minute.
  • File Explorer lets you see which folders and files are taking up the most space on your drive.
  • Your PC reserves space for system files and updates, so you won't see the full advertised capacity available for your own files.
  • If you're below 10 percent free space, your PC may slow down and you should consider removing files or programs.

Check storage in Windows Settings for a quick overview

Open Settings by pressing the Windows key and typing "settings," then pressing Enter. Once Settings opens, click System on the left sidebar. In the main panel, select Storage. You'll see a bar graph showing how much of your drive is full, the total capacity (usually listed in gigabytes or terabytes), and how much free space remains.

Below the bar, Windows lists categories: System & reserved (Windows itself and recovery files), Apps & features (programs you've installed), Documents, Pictures, Videos, Music, Recycle Bin, and Other. Click any category to see what's inside. This view is designed to give you the big picture without overwhelming detail.

Use File Explorer to see which specific files are using space

File Explorer shows you the actual folders and files on your drive, so you can see exactly what's taking up room. Open File Explorer by pressing Windows key + E, or clicking the folder icon on your taskbar. Right-click your main drive (usually labeled C:) and select Properties. A window opens showing total capacity, used space, and free space in both numbers and a pie chart.

To dig deeper, close that window and look at your folders in File Explorer itself. Large folders like Downloads, Documents, Pictures, and Videos are often the biggest space users. You can right-click any folder, select Properties, and see how much space that single folder occupies. This method takes longer than Settings but shows you the actual structure of what's on your drive.

Understand why your available space is less than advertised

A new PC advertised as having 256 GB or 512 GB of storage won't show that full amount as available. Windows reserves space for system files, recovery partitions, and updates. On a 256 GB drive, you might see only 200 GB available after Windows is installed. This is normal and expected — the advertised number is the physical capacity, not the usable space.

Additionally, Windows Update regularly downloads and installs updates, which temporarily use extra space during installation. Once an update completes, some of that space is freed, but older versions of Windows are sometimes kept as a backup. If you need to reclaim this space, you can delete old Windows versions through Settings > System > Storage > Temporary files, though this means you cannot roll back to the previous version if something goes wrong.

Know when your storage is dangerously low

If your free space drops below 10 percent of your total drive capacity, your PC may slow down noticeably. Windows needs room to create temporary files, cache data, and run updates. When space is tight, these operations compete for the same limited room, and your PC has to work harder. You might notice programs taking longer to open, files taking longer to save, or your PC freezing briefly during tasks.

If you're below 5 percent free space, Windows may refuse to install updates or run certain programs until you free up room. The easiest first steps are emptying your Recycle Bin (right-click it and select Empty Recycle Bin) and deleting old files from your Downloads folder. If that's not enough, you can uninstall programs you no longer use through Settings > Apps > Apps & features, or move large files like videos or photos to an external drive or cloud storage.

Check storage on an external drive or USB device

The same methods work for external drives and USB devices. Plug in the device, open File Explorer, right-click the drive in the left sidebar, and select Properties. You'll see the same capacity and free space information. This is useful if you're considering moving files to external storage — you can confirm the device has enough room before you start the transfer.

Keep in mind that external drives sometimes show slightly less available space than their advertised capacity for the same reason your main drive does: formatting and file system overhead. A 1 TB external drive might show 930 GB or 950 GB of usable space, depending on the file system (NTFS, exFAT, or FAT32) and how it was formatted.

Frequently Asked Questions

Why does my drive show less storage than what I paid for?

Windows and the file system take up space, and manufacturers measure capacity differently than the operating system does. A 256 GB drive typically shows around 200 GB available after Windows is installed. This is normal and not a defect.

Can I see how much storage individual programs are using?

Yes. In Windows Settings, go to System > Storage > Apps & features. Click any program to see its size. This helps you identify which programs take up the most room if you need to uninstall something to free space.

What's the difference between used space and free space?

Used space is what your files, programs, and Windows occupy right now. Free space is what remains available for new files and programs. Your total capacity is used space plus free space.

Should I worry if my storage is 80 percent full?

Not immediately, but you should start thinking about it. Once you hit 90 percent full, your PC may slow down. Consider moving large files to external storage or deleting files you no longer need before you reach that point.

How do I check storage on a Mac?

Click the Apple menu, select About This Mac, then click the Storage tab. You'll see a colored bar showing what's using space and how much free room remains. Click Manage to see options for removing old files or moving data to iCloud.