iOS5 Update Calendar Events Duplicated (Easy Fix)

Just downloaded the latest iOS from Apple, and everything seemed to have gone smoothly except for the fact that the calendar on my phone had a duplicate of all events.

I checked my phone sync settings on iTunes and noticed that I had the “Sync iCal Calendars” box selected.

Since iOS5 is now using iCloud to sync calendar events between all of your devices, apparently it’s no longer necessary to have this box selected.

Your calendars are being synced with iCloud over the air. You can also choose to sync calendars with this computer. This may result in duplicated data showing on your device.

Remove Duplicates

So all you’ve got to do is this:

  1. Plug in your iPhone
  2. Open iTunes
  3. Click on your phone under “Devices”
  4. Click the “Info” Tab
  5. Uncheck the “Sync iCal Calendars” box.
  6. If I remember correctly, it asked if I wanted to remove all of the events from my iPhone calendar. Yes.
  7. Sync again, and now your iPhone should show the proper events in your calendar. i.e. one of each, as opposed to the duplication.

Enjoy your iOs 5. I know I am.

Not sure how we ever survived without the notification center and other notification improvements.

About Jeremy Blake

Jeremy is a self-proclaimed socially-awkward penguin living in Utah. He makes money online. As he sleeps.


  1. Autocollectibles says:

    Unfortunately it caused all of my events in Outlook 2011 to become duplicates too. That’s the calendar I normally sync from (to iCal)

    • Morpethian says:

      I’m also having difficulties with Outlook for Mac since installing IOS 5. None of my appointments will sync across to iCal on my Mac or my iPhone, or vice versa – nightmare. Any suggestions?

  2. Tamara Dufour says:

    This didn’t work for me…any other suggestion…it’s driving me crazy!!

  3. I had the same problem. Here is how I solved it:
    1. Open your calendar on your iMac.
    2. Click the “calendars” icon in the upper left hand corner of the calendar.
    3. You will notice iCloud and On My Mac settings. Decide which you will go with.
    4. Uncheck all the events in one the two options.
    5. Your calendar will no longer be duplicated.

    • when I click on the calendar link of calendar it doesn’t give me an iCloud or On My Mac settings. I opened calenders and looked at the top bar where iCal File Edit Calendar, etc are listed. Is that where you are talking about?

  4. I solved with the solution described in this article (thanks) and also had to uncheck the local calendars in the upper top left tab in iCal.
    This might be useful as well:

  5. Tamara Dufour says:

    I have tried all of these and more…still duplicates…..grrr…when I open ical I don’t’ have the option of iCloud or my mac settings….only iCloud….

    • Same here.

      I un-synced calendars, then re-synced. That didn’t work.

      I unsubscribed from iCloud. Then un-synced and re-synced. That didn’t work.

      Seems this is an iOS 5 issue, not just an iCloud issue.

  6. Rabidgood says:

    Thanks, this was a big help. I see there are now warnings in the info section of iTunes warning of duplicates.

  7. Letty Kovich says:

    Try this, click on calendar icon on iphone main screen. Look at top left of the application and click on “calendars”. Calendars should pop up and allow you to edit the calendars you would like to appear. In my case, I had icloud and from my pc selected. Once I deselected icloud, all of my duplicates went away.

  8. None of this applies to me, either. MacBook Pro w/OS 10.6.8 and iPhone 4 w/iOS 5. Unchecked the iCloud options on the phone so it’s only displaying cal entries from my laptop. BUT – when I do a clean sync using the “Replace information on this phone” option in iTunes, I STILL get duplicate (and triplicate) events on my iPhone, including things that I’ve previously deleted from iCal on my laptop. My events in iCal are exactly the way I set them up. The events on the iPhone are messed up. If anyone has a clue, please let me know.

    • Have you figured this out? I’m in the same situation. It’s incredibly frustrating. At the point where I have more than triplicates for some entries… 7, 8, 9 copies!

    • Junk101663 says:

      This is happening to me too.

      • Junk101663 says:

        BTW I have a iMac running 10.6.8 and I phone 3GS with iOS 5.1.1. I don’t use iCloud. I’m having the same issue with duplicate, triplicate and deleted entries showing up on the iPhone (but not on iCal on my iMac). I’ve tried full resets, setting up as a new phone…all to no avail.

  9. Genius; worked like a charm. Thanks!

  10. Yay! Thank for the tip!

  11. Yee buddy!!! Worked!

  12. Egerszegi says:

    This tip worked for me too. Thanks!!!

  13. Harrison J. Crowe says:

    Would this also work for Notes? I keep getting duplicates there. I’m not certain as to which duders to check or uncheck.

  14. THANKS!!!

  15. thank you so much-this has worked for me with Outlook and iphone 4.

  16. Robert Stack says:

    Found the fix after two hours. Setup iCloud and sync your calendar at least once. Open iTunes and then goto… your device…info tab and then under your calendar uncheck… sync calendar with outlook. on your iphone goto calendar then calendars button at top left….only check the iCloud Calendar with the purple dot. click done, and that’s it!!!!

  17. Thanks, this took a few tries but it worked. Thanks for your help.

  18. Utah, thanks again, I forgot to tell you that the genius at the apple store told me this was a glitch and there was no fix for this. He also said he had duplicate and triplicate entries in his phone calendar. Wish I had gone here first.

  19. THANK YOU SO MUCH. Good lord that was driving me nuts. Best & easiest answer/fix. Much appreciated :)

  20. I have Iphone 4s and outlook 2010 (i am sure everyone heard by now about the incapability of sincing the two together).

    I decieded to install Icloud on my computer to sync the two together. Now, i have duplicate apts in my I phone plus on my pc I have my reg calendars and i calendars…????

    I am so confused by this and every change I make on my reg calendars, it does not show on my phone!!

    What do I do?? Please help.

  21. I have a new Macbook Pro/ Calendar events on my iPhone 4 do not sync with my iCal.

  22. PieterJkuiper says:

    Yes thank you Finally

  23. Charissa says:

    Thank you so much!!!

  24. After searching too long I found this page. Worked perfectly. Thank you!!

  25. I love you so much right now. Thank you tons for your help!!!!

  26. Bengolfin1 says:

    I am syncing 3gs with windows 7 itunes and outlook 2010 calendar and have many duplicates. I deleted the events completely and re-entered them and thought all was well. Then did another sync and tons of duplicates showed up again. Is there a solution regarding Outlook. I did have iclouds synced but it was a disaster and stopped it and went back to syncing to the computer. I think that is when all this crap started. Wish I had never used iclouds. Any ideas?

  27. A million thanks. This had been bugging me. Your explanation was simple and worked perfectly. Thanks again

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