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How to Combine Multiple SharePoint Calendars into One

Aamir Naveed Akram Sep 30, 2026 868 views

Question details

The user needs to consolidate or view multiple department calendars in SharePoint Online as a single, unified calendar.

How to Combine Multiple SharePoint Calendars into One Calendar

Product: Microsoft SharePoint Online
Device & OS: not provided
Scenario: Coordinating events across various departments and needing a centralized master calendar view.
Observed behavior: The calendars are currently maintained in separate lists or sites, making it difficult to visualize all organizational events in one place.

Before you start

Verify whether the department calendars you want to combine are hosted on the same SharePoint site collection or across different sites, as this will determine the integration method.

Solution 1Recommended

Use Calendar Overlay for Calendars on the Same Site

The most straightforward method for combining calendars that reside within the same SharePoint site collection using native features.

SharePoint includes a built-in Calendar Overlay feature that allows you to layer up to 10 different calendars into a single, unified master view. This method is highly recommended if all target calendars are located on the same site.

Navigate to the Master Calendar

Open the SharePoint calendar you want to act as your primary or master calendar.

Access Calendar Overlay Settings

Click on the 'Calendar' tab in the top ribbon menu, and then select 'Calendars Overlay'.

Add a New Calendar

Click the 'New Calendar' link. Provide a descriptive name for the overlay, select a display color, and paste the Web URL where the target department calendar is located.

Resolve and Save

Click the 'Resolve' button to locate the calendar list. Choose the specific department calendar and view from the drop-down options, then click 'OK' to finalize the overlay.

Use Calendar Overlay for Calendars on the Same Site

Color Coding: Assigning a unique color to each department calendar during the overlay setup makes it easy to visually distinguish which event belongs to which department in the master view.

Solution 2

Sync Calendars Across Different Sites using Power Automate

Necessary when you need to merge events from SharePoint calendars that are hosted on entirely different SharePoint sites.

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Frequently Asked Questions

Is there a limit to how many calendars I can overlay in SharePoint?

Yes, SharePoint typically allows you to overlay up to 10 different calendars into a single master calendar view. If you need to combine more, you might need to use Power Automate to sync the items into a single list instead.

Can I overlay an Outlook Exchange calendar with a SharePoint calendar?

Yes, you can overlay an Exchange calendar onto your SharePoint view. During the Calendar Overlay setup, select 'Exchange' instead of 'SharePoint' and provide your Outlook Web Access URL and Exchange Web Service URL.

Will Power Automate create duplicate events if a department calendar event is updated?

If you only use the 'When an item is created' trigger, updates won't be synced, and running manual syncs could cause duplicates. To handle updates and prevent duplicates, you should use the 'When an item is created or modified' trigger and include a condition to check if the event already exists in the master calendar based on a unique ID.

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