On Windows, go to Settings > System > Display > Advanced display
Check the Refresh rate value listed there
On Windows, right-click the desktop and open Display settings to reach Advanced display
On macOS, go to System Settings > Displays
Check the Refresh Rate or ProMotion setting if available
On Linux, open Display Settings and look for Refresh Rate
Use your monitor’s on-screen display menu and check the information or settings section
Check the monitor’s manual or product specifications
Search the monitor model number online
Use a display testing website or utility that shows the current refresh rate
Check your graphics control panel such as NVIDIA Control Panel, AMD Software, or Intel Graphics settings