Knowing how much RAM you have is important to determine if you need an upgrade or if you have enough for your needs.
To check RAM in Windows 10 and 11, open the Settings app, select System, and navigate to About, where the installed RAM is listed.
In macOS, click the Apple menu, select About This Mac, and the installed RAM will be displayed under the Overview tab.
In Chrome OS, open the Chrome browser, type 'chrome://system' in the search bar, scroll down to meminfo, and the RAM amount will be listed next to MemTotal.