How to Fix Mac Running Out of Memory

Fix Mac memory issues with these proven steps. Clean up RAM, manage storage, and optimize performance to stop out of memory errors on macOS.

1. Check current memory usage. Open Activity Monitor from Applications > Utilities or press Command + Space and type "Activity Monitor". Click the Memory tab to see RAM usage. Look at the Memory Pressure graph at the bottom — red indicates memory stress.
2. Close memory-intensive applications. In Activity Monitor, select high-memory applications and click the X button in the toolbar, then choose Force Quit. Focus on browser tabs, creative applications like Photoshop, and any apps showing "Not Responding" status.
3. Clear browser cache and tabs. Close unnecessary browser tabs — each tab consumes RAM. In Safari, go to Safari > Clear History and Website Data. In Chrome, press Command + Shift + Delete and select "All time" to clear browsing data including cached files.
4. Free up storage space. Click Apple menu > About This Mac > More Info > Storage Settings. Delete large files, empty Trash, and use the recommendations shown. Ensure at least 15-20% of your drive remains free for virtual memory to function properly.
5. Restart your Mac. Click Apple menu > Restart to clear RAM and reset all running processes. This immediately frees all memory and gives you a clean slate. Save any open work before restarting.
6. Manage startup items. Go to System Preferences > Users & Groups > Login Items and remove applications you don't need at startup. Fewer startup apps means more available RAM when your Mac boots.
7. Reset SMC if issues persist. Shut down your Mac. For MacBooks with T2 chips, press and hold power button for 10 seconds. For Intel Macs, press Shift + Control + Option on left side plus power button for 10 seconds. Release all keys and restart.