iCloud

Create a calendar on iCloud.com

You can create and manage one or more calendars and access them on any iOS device, iPadOS device, or computer that has iCloud Calendar turned on.

The iCloud Calendar window, with several calendars visible. Assign a different color to each calendar. An event’s color indicates which calendar it’s in. Select or deselect a checkmark to show or hide a calendar.

In Calendar on iCloud.com, click the Action pop-up menu in the bottom-left corner, then choose New Calendar.
Type a name for the calendar, then press Return.

Your calendars are listed in the sidebar on the left.

You can view as many calendars as you want at the same time.

iCloud Calendar includes two default calendars: Home and Work. You can rename or delete them, but you must always have at least one calendar in the list.

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iCloud User Guide

Create a calendar on iCloud.com