Check your total storage and how much is left

The fastest way to see how much storage your PC has and how much you are using is to open File Explorer, right-click on your C: drive (or whichever drive you want to check), and select Properties. A window will pop up showing a pie chart and two numbers: one for used space and one for free space. The chart fills from the center outward, so a mostly full circle means your drive is nearly full.

If you are using Windows 11, you can also go to Settings > System > Storage to see the same information in a cleaner layout. This view also breaks down storage by category—Documents, Pictures, Videos, Apps, and so on—so you can see at a glance which type of file is taking up the most room.

Key Takeaways

  • Right-click your C: drive in File Explorer and select Properties to see total storage and free space in seconds.
  • Windows 11's Settings > System > Storage shows storage use broken down by file type, making it straightforward to spot what is hogging space.
  • Large folders like Downloads, Documents, and your user profile often hold gigabytes of files you may have forgotten about.
  • Temporary files, old Windows installations, and duplicate photos are common culprits when storage fills up fast.

Find which folders are using the most space

If you know your drive is full but the Properties window does not tell you which folders are responsible, you need to dig deeper. Open File Explorer, navigate to your C: drive, and look for the largest folders. Common space-hogs are your Downloads folder (often full of old installers and files you forgot about), your Documents folder, and your user profile folder, which contains Desktop, Pictures, Videos, and AppData.

To see the size of a folder without opening it, right-click the folder and select Properties. A window will show you the total size. If you want to see the size of every folder at once, you can use the built-in Disk Usage tool. In Windows 11, go to Settings > System > Storage > Advanced storage settings > Disk usage to see a ranked list of your largest folders and files.

Use the Storage Sense tool to see what is taking space

Windows 10 and 11 both include a tool called Storage Sense that automatically scans your drive and shows you what is using space. To open it, go to Settings > System > Storage and look for the "Storage Sense" option near the top. Click it, then click See your storage usage. A detailed breakdown will appear showing Apps and features, Temporary files, System and reserved, and other categories.

Storage Sense can also delete temporary files, old downloads, and items in your Recycle Bin automatically. You can set it to run daily, weekly, or monthly, or run it once manually. This is useful if your drive fills up frequently and you want Windows to clean up after itself without you having to remember.

Check individual app and program sizes

If you suspect a single program is taking up too much room, you can see exactly how much space each app uses. Go to Settings > Apps > Apps and features (Windows 11) or Settings > Apps > Apps and features (Windows 10). Scroll through the list and click on any app to see its size. Some apps, especially games and video editing software, can be several gigabytes each.

If an app is using more space than you expected, you have two choices: uninstall it to free up space, or move it to an external drive if you want to keep it but do not have room on your PC. To uninstall, click the app name and select Uninstall. To move it, some apps allow you to choose a different location during installation, but most require uninstall and reinstall on the new drive.

Look for duplicate files and old backups

Over time, PCs accumulate duplicate files—photos copied multiple times, backup folders you forgot about, old versions of documents. These can add up to gigabytes of wasted space. Check your Downloads folder first; it often contains old installers, PDFs, and files you downloaded months ago and never deleted. Your Documents folder may also hold old project files or backups you no longer need.

Windows also creates backup copies of system files and old Windows installations when you update. If you have updated Windows recently, you may have a folder called Windows.old taking up several gigabytes. You can safely delete this folder if you are happy with your current Windows version and do not plan to roll back. To delete it, right-click the folder and select Delete, or use Disk Cleanup (search for "Disk Cleanup" in the Start menu).

Check if your drive is actually full or just running slow

Sometimes a PC feels slow even though the storage bar shows plenty of free space. This usually means your drive is fragmented (files are scattered across the disk) or your RAM is full, not that you are out of storage. To check your RAM usage, right-click the taskbar and select Task Manager. Click the Performance tab and look at the Memory section. If it shows 90 percent or higher, your RAM is the bottleneck, not your storage.

If your storage shows 85 percent full or higher, your drive will slow down even if it is not completely full. Windows reserves space for system operations, and when that space shrinks, everything gets slower. In this case, you should delete or move files even if the drive does not feel "full" yet. Aim to keep at least 10 to 15 percent of your drive free for Windows to operate smoothly.

Frequently Asked Questions

What does "System and reserved" mean in Storage Sense?

System and reserved space is used by Windows itself—the operating system files, drivers, and system caches. You cannot safely delete this, and it usually takes 20 to 40 gigabytes depending on your Windows version and how many updates you have installed. If this number seems too high, you can try running Windows Update to may support you have the latest version, which sometimes compresses system files.

Can I move files to an external drive to free up space?

Yes. Plug in an external drive, open File Explorer, and drag large folders (like Pictures, Videos, or old project folders) to the external drive. Once the transfer is complete, you can delete the originals from your PC. Just make sure the external drive has enough space and keep it plugged in if you need to access those files regularly.

Is it safe to delete files in the Temp folder?

Yes, temporary files are safe to delete. You can find them by typing %temp% in the File Explorer address bar and pressing Enter. Select all files (Ctrl+A) and delete them. Some files may be in use and will not delete, but that is normal—just skip those. You can also use Storage Sense to delete temp files automatically.

Why does my drive show full when I just deleted a bunch of files?

Deleted files go to the Recycle Bin first and do not actually free up space until you empty it. Right-click the Recycle Bin on your desktop and select Empty Recycle Bin. After that, the space will show as free. If you deleted files from an external drive or SD card, they may skip the Recycle Bin and delete when ready, so check that the files are actually gone before assuming the space is still taken.

How much free space do I actually need on my PC?

Keep at least 10 to 15 percent of your drive free for Windows to run smoothly. If your drive is 500 gigabytes, aim for 50 to 75 gigabytes free. If you regularly work with large video or photo files, keep 20 to 25 percent free. The more free space you have, the faster your drive will perform and the less likely you are to run into slowdowns or errors.