Windows: Press Ctrl + Shift + Esc, open Task Manager, and check the Performance > Memory tab
Windows: Open Settings > System > About and look for Installed RAM
Windows: Press Win + R, type msinfo32, and check Installed Physical Memory
Mac: Click the Apple menu > About This Mac and check the Memory line
Linux: Open a terminal and run free -h
Linux: Open a terminal and run cat /proc/meminfo
Check your computer’s system information page in BIOS or UEFI
Check the label or documentation for your device model
Use a third-party system information tool if needed