On Windows, press Ctrl + Shift + Esc, open Task Manager, and check the Performance tab under Memory
On Windows, open Settings, go to System, then About, and look for Installed RAM
On Mac, click the Apple menu, select About This Mac, and check the Memory line
On Linux, open a terminal and run free -h
On Linux, open a terminal and run cat /proc/meminfo
On Linux, use lshw -short -C memory
On iPhone or iPad, go to Settings, then General, then About, and check device memory if shown by the device
On Android, go to Settings, then About phone, and look for RAM or Memory
Check your computer or device specifications on the manufacturer’s website
Open your BIOS or UEFI setup screen and look for installed memory information