Open Google Calendar
In the left sidebar, find the calendar you want to delete
Hover over the calendar name
Click the three-dot menu next to the calendar
Select Settings and sharing
Scroll down to Remove calendar
Click Delete
Confirm the deletion
To delete a calendar you own from the web
Open Google Calendar
Click the gear icon
Select Settings
Choose the calendar from the left sidebar
Scroll to Remove calendar
Click Delete
Confirm
To remove a calendar from your view without deleting it
Open Google Calendar
Find the calendar in the left sidebar
Uncheck the box next to the calendar name
To delete a shared calendar you do not own
Open Google Calendar
Find the calendar in the left sidebar
Click the three-dot menu
Select Unsubscribe or Remove calendar
To delete all events from a calendar without deleting the calendar
Open the calendar
Select all events
Delete the events individually or in bulk