How to Delete a Calendar in Outlook (and Why Some Won't Go)

An old project calendar, a colleague's calendar you opened once, a holiday calendar you no longer need: Outlook's calendar list fills up quickly. Removing the extras makes your week far easier to read. There's one calendar you can't delete, and one reassuring fact about shared calendars that stops people worrying they'll wipe a colleague's diary. Here's how it all works.

Delete a calendar in classic Outlook

1. Go to Calendar.
2. In the folder pane, right-click the calendar you want to delete.
3. Select Delete Calendar.
4. Select Yes to confirm.

Remove a calendar in new Outlook

1. In Calendar, look at the side pane.
2. Find the calendar you want to get rid of.
3. Select More options next to its name.
4. Select Remove.

If you just want it out of sight for now, clear the tick next to the calendar name instead. That hides it without removing it.

Why Delete is greyed out

Microsoft says that if the Delete command is greyed out, you can't delete that calendar, and the most common reason is that it's your primary calendar. Your primary calendar keeps track of the meeting requests you send and accept and the appointments you schedule, so Outlook won't let you remove it. You can hide it or close it from view if you have another calendar open.

Emptying your primary calendar instead

If what you really want is a fresh start, you can delete everything in your primary calendar while keeping the calendar itself. In classic Outlook:

1. In Calendar, select View.
2. Select Change View, then List.
3. Click in the list and press Ctrl+A to select every item.
4. Right-click and choose Delete.

Be careful. Microsoft warns this deletes all items, including holidays that were added automatically, and you'd need to add holidays again afterwards. Meetings with other people will also be affected, so this is a last resort rather than a tidy-up.

Removing a colleague's or team calendar is safe

Here's the reassuring part. When you open someone else's calendar, a team calendar or a SharePoint calendar, you're viewing a copy. Microsoft says that when you delete it, the source calendar stays intact and only your copy is removed. So you can clear shared calendars from your list without worrying about wiping someone's diary.

Which option do you need?

You want to	Do this
Get rid of a calendar you created	Delete Calendar (classic) or Remove (new)
Stop seeing a colleague's calendar	Delete or Remove it; their calendar is unaffected
Hide a calendar for now	Untick it in the side or folder pane
Clear out your main calendar	List view, Ctrl+A, Delete (with care)
Delete your primary calendar	Not possible; empty it or hide it instead

Before you delete a calendar you created

• Check whether you've shared it with anyone, because they'll lose it too.
• Move any events you want to keep onto your main calendar first.
• Consider exporting it as a backup if it holds important history.

Deleting calendars on your phone

The Outlook mobile app is better for hiding calendars than deleting them. Open the calendar view, tap the menu and untick calendars you don't want to see. For removing calendars from your account for good, the desktop app or Outlook on the web is the place to do it, and the change then shows up on your phone.

Holiday and birthday calendars

Any you added for public holidays, sports fixtures or birthdays count as additional calendars, so you can remove them in the same way. If you only want them out of your way during busy weeks, untick them instead, then tick them again when you're planning time off. It's a small habit that keeps your working week uncluttered, and it means you can still check a bank holiday date in seconds when you need to.

Shared calendar you own

If you created a calendar and shared it with colleagues, think twice before deleting it. Unlike removing someone else's calendar from your view, deleting a calendar you own takes it away from everyone you shared it with. If the team still uses it, hand it over to a colleague or keep it and simply hide it on your side. That way nobody turns up on Monday to find their schedule has vanished.

Keep your calendar list under control

A few calendars, each with its own colour, is far easier to manage than a dozen. I keep my main calendar, one for content planning and one shared team calendar, and hide the rest. If meetings are crowding your calendar, my thoughts on the AI meeting notetaker problem are worth a look, and my email sequence prompt pack helps with the follow-up emails meetings create.

My verdict

Right-click and Delete Calendar in classic Outlook, or More options and Remove in new Outlook. Your primary calendar can't be deleted, only emptied or hidden. Removing a colleague's or team calendar only removes your copy, so it's completely safe.

Frequently asked questions

How do I delete a calendar in Outlook?

In classic Outlook, right-click the calendar and choose Delete Calendar. In new Outlook, select More options next to it and choose Remove.

Why can't I delete a calendar in Outlook?

If Delete is greyed out, it's usually your primary calendar, which can't be deleted.

Does deleting a shared calendar delete it for the owner?

No. Microsoft says you're viewing a copy, so the source calendar stays intact.

How do I delete everything in my Outlook calendar?

In classic Outlook, switch to List view, press Ctrl+A, right-click and choose Delete. This also removes holidays.

How do I hide a calendar in Outlook without deleting it?

Clear the tick next to the calendar name in the side or folder pane.