Displaying Events from Multiple Google Calendars in a Single Embedded Calendar View

Of all the things Google Calendar is good for, producing a single embedded calendar from a set of Google Calendars has not been one of them…

[Cue sideaways glance] Or so I thought…

In a flurry of activity earlier today, the Reverend posted this:

while I was admiring the new link to UMW Blogs on the UMW homepage, I clicked on the Events link, and to my surprise it was a Google calendar. Wow! Who knew? When looking at the source code, I released it was actually an aggregation of 10 different Google Calendars–all the more fascinating.

Jim went on: “I did a search for the term “UMW” through Google’s public calendars and found over 40” and the describes subscribing to the calendars, looking at them in the single aggregated view within Google Calendar itself, before hitting a problem: “Google won’t given me an embed code for the aggregation of all of the public calendars I subscribed to around UMW”

Err… rewind one moment… “When looking at the source code, I released it was actually an aggregation of 10 different Google Calendars“…?

This is what Jim saw but didn’t see:

Got it yet?

Take these two calendars, discovered by searching the Public Calendars in Google Calendar:
Snooker Championships Listing (some events are listed over the next four months or so).
Formula One Grand Prix listings for 2009 (the events start during March, 2009).

Now look through to March on this calendar: aggregated calendar view. It shows events from both calendars in the same view.

So what we have here is an aggregated calendar view that can be used to display several (that is, multiple) Google calendar feeds in a single view. To embed the calendar in your own page, just stick it in an iframe.

For each extra calendar feed, just add &src=CALENDAR_ID to the URL. The CALENDAR_ID will probably be of the form:

PS I did wonder whether I could add the aggregated calendar view as a single calendar to my Google Calendar. It seems not:

That is, it looks like each calendar feed will be added separately, rather than as a single, combined calendar.

But while that would have been a “nice to have”, the ability to display events from multiple Google calendars in a single calendar view in such a straightforward way is probably a big enough win anyway:-)

PPS aren’t comments wonderful (thanks Steve:-) – it seems thaqt you can generate the combined embed code within Google Calendar… Subscribe to the calenders you want to display, then go to the calendar settings:

Select the “Customise the color, size and other options” in the “Embed the Calendar” area:

And then select the calendars you want to include:


Author: Tony Hirst

I'm a Senior Lecturer at The Open University, with an interest in #opendata policy and practice, as well as general web tinkering...

31 thoughts on “Displaying Events from Multiple Google Calendars in a Single Embedded Calendar View”

  1. I had to do something similar for a set of Google calendars recently and did it through the GUI (Calendar settings > Customize the color, size, and other options > Calendars to Display).

    The resulting embed code is the same as shown in your post, but might be a bit easier to produce.

    Users get the option to show/hide each calendar in the aggregated, embedded view.


  2. Tony,

    I have to thank your network, I had no idea, and now I know. I feel stupid, but I also feel rich as kings. So thank you much. And while I see the option in Google Calendars now, the question of aggregation ical from a series of different calendars remains the next step in my mind. Need we ask everyone to use Google? Etc.

    Anyway, thanks for go the extra yeard, and sorry for overlooking the obvious twice :)

  3. After stripping the iFrame out, I found that I had to convert all the “&” to “&” in order to use the Google generated code as a stand alone link. Otherwise it would produce a blank calendar.

    Google generated:

    Just stripping the iframe out produces a blank calendar:


    Stripped and formatted to use as a stand alone link, including colors:


  4. ahhhh, this keeps stripping things out of my comments!

    remove all the “amp;” from after the “&” sign, and everything works as a link.

    1. Brandt – your tip was just what I needed as I couldn’t figure out how to turn the iframe code into a stand alone link. Great Work!

  5. Thanks for this critical info. We have been using HTML Calendaring for our site and I have wanted this functionality out of Google Calendar. I greatly appreciate it!

  6. Brandt – you are my hero – that is exactly what I was looking for. I am using embedded calendars showing multiple calendars but some mobile browsers don’t support the iframe, so they were locked out of the calendar.

    Now with what you mentioned about swapping out the ampersand codes with real ampersands, which creates a standalone link, I can check for mobile browsers and deliver the stand alone link to them.

  7. Very neat feature that allows me to seperate my personal and work calenders for sharing and yet see them all in one place.

  8. dude
    yeah, “embed this calendar”
    “customize” – select desired calendars
    and it does the code, no editing required

  9. To get the aggregated view on your site:

    In google sites create a new page. Then insert calendar. Then in the calendar properties, click on ‘Display Another Calendar’ link. You can do this for many calendars and google will aggregate them into one view on your site :)

    Hope this helps

    1. What if I want all my calendars together in one google sites calendar, but have the option of only seeing some of them. For example, in my Cub Scout pack, a parent might want to see information about the pack and his den, but not other dens.


  10. Tony, thanks for the tips. So I’m able to embed a calendar with multiple calendars into on single calendar view. Is there a way to then generate an XML link for the new aggregated calendar calendar?


    1. @scott it’s some time since I looked at this, so not sure offhand… will try to find out… (if you beat me to it, please post an update;-)

  11. Too bad it is limited to 25 calendars to embed in the HTML code today.

    I would need about 40 (for an dance school, 40 different types of lessons).
    If anyone should know a way how to make such an embedded calendar view with more than 25 individual calendars, please share.

  12. Hi Tony, Jim, Brandt and all other contributors

    Some great information here and has now got my daughter’s school website nicely “calendarised” – http://www.victoriaprimary.ecape.school.za

    FotoDirk: I also ran into this limitation as I have upwards of 40 calendars. The question is, do those all have to be publically viewable in an aggregated way, or can you put up groups of lessons? Also, if you get that actual students to register on google and then import all the calendars, they will be able to see them all through the Google calendar view.

    I agree, it is a limitation requiring workarounds, but life is often like that :-)

    1. Hi Billy – Great stuff:-) I think the Google Calendar API has moved on somewhat since I wrote this post: I’ll try to go through the comments over the next week or two to distill the various workarounds and add any updates into the original post.

      Thanks to all the other comment contributors too:-)

    1. It does not even have to be a Google Sites page – it can be any website. Feel free to look through http://www.vps.ecape.school.za/calendar.html and http://www.vps.ecape.school.za/hockey.html as some examples of displaying public calendars aggregated in different ways. http://homes.cs.ru.ac.za/Billy/ will show you an example of showing just the free/busy details of a personal calendar. If I have shared a calendar with a specific person and they are logged in, the details will show. It works beautifully. Also take a look at Appointment Slots :-)

Comments are closed.

%d bloggers like this: