- On your computer, open Google Calendar. (You can't export your calendar from the Google Calendar app)
- In the top right, click Settings Settings.
- Click the Calendars tab.
- Between the "My Calendars" and "Other Calendars" sections, click Export calendars.
A ZIP file will be downloaded to your computer. If you open the ZIP file, you'll see individual ICS files for each of your calendars.
To import the files back into Google Calendar, take the individual ICS files out of the ZIP file and import them one by one. Learn more about importing files.