Open Google Calendar on your computer
Sign in to your Google account
In the left panel, find the calendar you want to share
Hover over the calendar name and click the three dots
Select Settings and sharing
Scroll to Share with specific people or groups
Click Add people and groups
Enter the person’s email address
Choose their permission level
Click Send
If needed, make the calendar public in the Access permissions section
On mobile, open Google Calendar and use a browser if sharing options are not available in the app