How to Check Disk Space on Mac
Why You Should Regularly Check Disk Space
Knowing how much disk space mac has available helps you avoid storage emergencies. When your disk gets too full, macOS becomes slow and unstable. Checking regularly lets you catch problems early and take action before things get critical.
There are several ways to check your storage, from simple one-click methods to detailed Terminal commands. Each gives you a different level of detail about your disk space mac usage.
Method 1: About This Mac
The quickest way to check disk space mac has available is through About This Mac. Click the Apple icon in the top-left corner of your screen and select About This Mac. On macOS Ventura and later, click More Info, then scroll down to Storage. On older versions, click the Storage tab directly.
You will see a colored bar showing how your storage is divided. Hover over each section to see the category name and size. Below the bar, you will see the total capacity and available space.
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Method 2: System Settings Storage Panel
For more detail, open System Settings, go to General, then Storage. This view shows each category with an exact size. You can click the info icon next to categories to see what files they contain and delete things directly.
This is the most useful built-in tool for understanding disk space mac usage. It lets you see which categories are taking the most space and take action immediately. The Applications and Documents sections are interactive, letting you sort and delete files right from this panel.
Method 3: Finder Get Info
Select your main hard drive in Finder (usually called Macintosh HD), right-click, and choose Get Info. This shows the drive's total capacity, available space, and used space in exact bytes. This is the most precise reading you can get.
You can also check folder sizes this way. Right-click any folder and choose Get Info to see its total size. This is helpful when you want to know exactly how much space a specific folder like Photos, Music, or Documents is using on your disk space mac.
Method 4: Terminal Commands
For power users, Terminal provides the most detailed disk space information. Open Terminal and type df -h to see all mounted volumes with their size, used space, and available space. The output shows percentages so you can quickly see how full each volume is.
To check specific folder sizes, use the du command with the -sh flag on any directory. Or check all folders in your home directory at once to see a sorted list of the biggest folders. Terminal gives you the most granular view of your disk space mac.
Method 5: Disk Utility
Open Disk Utility from Applications, then Utilities. Select your internal drive to see a visual display of used vs free space. Disk Utility also shows partition information, file system type, and SMART status for your drive. This is the most comprehensive view of your disk.
Disk Utility is also where you can check if your drive has errors. Click First Aid to run a diagnostic scan. A healthy drive is just as important as having enough free space.
How to Read Storage Numbers
When checking disk space, remember that macOS reports sizes in base-10 (1 GB = 1 billion bytes) while some tools use base-2 (1 GiB = 1.07 billion bytes). This means you might see slightly different numbers depending on which tool you use.
Also note that purgeable space appears as used in some views but available in others. Purgeable space includes caches and optimized iCloud files that macOS can delete if needed. Your actual available space is the reported free space plus purgeable space.
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