Create a calendar on iCloud.com

You can create and manage one or more calendars and access them on any device with Calendars turned on in iCloud settings.

The Calendar window on iCloud.com, with several calendars visible. The calendars are assigned different colors, and an event’s color indicates which calendar it’s in.

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

Your calendars are listed in the sidebar on the left.

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

Calendar includes four default calendars: Work, Calendar, Home, and Family. 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