Check Free Hard Disk Space in Windows 10

Updated 6 November 2026 · Standard formula, shown below

To check the amount of free space left on your hard disk in Windows 10, open File Explorer, click “This PC” in the left sidebar, and look under “Devices and drives” — each drive shows a blue bar with the free and used space. For a more detailed breakdown, right-click a drive and select “Properties” to see exact numbers in gigabytes (GB) and a visual pie chart. This guide explains every built-in method, how to interpret the results, and what to do when space runs low.

Why Checking Free Space Matters

Windows 10 needs a minimum amount of free disk space to operate smoothly. The operating system uses free space for temporary files, virtual memory (the pagefile), system restore points, and the hibernation file. When free space drops below about 10% of the drive’s total capacity, performance can degrade noticeably: programs take longer to open, updates fail to install, and you may see warnings like “Low disk space.”

Knowing your free space is also essential before installing large applications, downloading games, editing video, or creating system backups. If you plan to upgrade to a newer Windows feature update, Microsoft typically recommends having at least 20 GB free for 64-bit systems, though the actual requirement varies by version and installed apps.

Method 1: File Explorer (Quickest)

This is the method most people use because it takes only a few seconds.

Press Windows key + E to open File Explorer.
Click This PC in the left navigation pane. If you don’t see it, click “File” → “Change folder and search options” → “View” tab and check “Show all folders” or simply type This PC in the address bar.
Under Devices and drives, each hard disk partition is listed with a blue capacity bar. The bar shows the proportion of used space; the text below states the free space in GB and the total size, for example “Free: 150 GB of 475 GB.”
To see a more detailed view, right-click a drive and choose Properties. The General tab shows a pie chart and exact numbers for Used space and Free space.

If you have multiple drives (C:, D:, etc.), repeat the process for each one. Note that the C: drive is where Windows is installed and is the one that typically fills up fastest.

Method 2: Settings App (Modern Interface)

Windows 10’s Settings app provides a cleaner, more visual summary, especially useful for beginners.

Click the Start button and select the gear icon (Settings).
Go to System → Storage.
Under “Local Disk (C:)”, you’ll see a bar showing how much space is used and how much is free. Click on the drive to see a breakdown by category (Apps, Documents, Temporary files, etc.).
You can also click “Show more categories” to see system files, which are often hidden by default.

This view is particularly helpful because it shows what is consuming space, not just the total free amount. It also links directly to cleanup tools like Storage Sense.

Method 3: Command Line (PowerShell or Command Prompt)

If you prefer typing commands or need to check space on multiple computers remotely, the command line is efficient.

PowerShell: Open PowerShell and type Get-PSDrive C — it shows Used and Free in gigabytes. For all drives, type Get-PSDrive -PSProvider FileSystem.
Command Prompt: Type fsutil volume diskfree C: to see free and total bytes. Or use wmic logicaldisk get size,freespace,caption for a readable list of all drives.
Disk Management (diskmgmt.msc) also shows free space per partition, but it’s more for managing partitions than quick checks.

These methods give the same underlying data as File Explorer, just in a text format. They are useful when you need to script or automate checks.

Understanding the Numbers: GB vs GiB and Why Windows Shows Less Than Advertised

Hard drive manufacturers advertise capacity using decimal units (1 GB = 1,000,000,000 bytes), while Windows uses binary units (1 GiB = 1,073,741,824 bytes). This is why a drive labeled “1 TB” shows as roughly 931 GB in Windows. The difference is about 7% for larger drives.

So when you see “Free: 150 GB” in Windows, that is actually 150 GiB (binary). This is normal and not an error. Also, the free space shown in File Explorer may not exactly match the sum of all files you see because of hidden system files, the pagefile.sys, and the hibernation file, which are not visible by default.

Common Problems and How to Fix Them

If you find that free space is lower than expected or disappearing quickly, here are the usual culprits and solutions:

Temporary files: Use the built-in Disk Cleanup tool (type “Disk Cleanup” in Start) or Storage Sense in Settings to remove temporary files, recycle bin contents, and Windows update leftovers.
Windows Update cache: The SoftwareDistribution folder can grow large. Run Disk Cleanup and select “Windows Update Cleanup” to safely remove old update files.
System Restore points: These can consume several GB. In System Properties, you can adjust the maximum disk space used for restore points.
Hibernation file: If you never use hibernate, you can disable it with powercfg /h off in an elevated Command Prompt, freeing space equal to about 40% of your RAM.
Large apps and games: Uninstall unused programs via Settings → Apps. Some games exceed 100 GB.
Downloads folder: Check this folder; it often accumulates large files you forgot about.

If you’re still low after cleanup, consider moving personal files (videos, photos) to an external drive or cloud storage. For a more permanent solution, you can shrink a partition and create a new one, but that’s advanced.

Frequently Asked Questions

Why does my C: drive show less free space than the sum of all files I can see?

Hidden system files like pagefile.sys, hiberfil.sys, and System Volume Information are not visible by default. They can take up several GB. To see them, enable “Show hidden files” in File Explorer options, but be careful not to delete them.

Is there a keyboard shortcut to check free space?

No, there is no single shortcut that shows free space directly. The fastest is Windows+E, then click This PC. Alternatively, you can create a desktop shortcut to This PC and pin it to the taskbar.

How much free space should I keep on my Windows 10 drive?

Microsoft recommends at least 20 GB for updates, but for smooth performance, aim for at least 10-15% of the drive’s total capacity. For a 256 GB SSD, that’s about 25-38 GB. SSDs also need free space for wear leveling and TRIM, so don’t fill them to the brim.

Why does the free space number change every time I check?

Windows constantly writes temporary files, logs, and browser caches. Also, background tasks like Windows Defender scans and system restore points can temporarily use space. It’s normal for the number to fluctuate by a few hundred MB.

Can I check free space on another computer from my PC?

Yes, if you have admin rights on the remote computer and it’s on the same network, you can use PowerShell’s Get-WmiObject -ComputerName PCNAME Win32_LogicalDisk or simply map the drive and look in File Explorer. This requires proper permissions and network discovery enabled.

What does “Low disk space” warning mean exactly?

Windows shows this when free space on a drive falls below 200 MB (for the system drive) or 100 MB (for other drives). It’s a critical threshold; you should free space immediately to avoid system instability.

Comparing Methods: Which One Should You Use?

For a quick glance, File Explorer is best. For understanding what’s taking space, use Settings → Storage. For scripting or remote checks, use PowerShell. All methods show the same core data, so choose based on your comfort level. If you’re helping someone else, the Settings app is the most intuitive.

Remember that free space is not static — it changes as you work. Make it a habit to check periodically, especially before installing large software or when you notice your PC slowing down. A little attention now can prevent bigger problems later.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.