Determining SharePoint Online storage usage

Another really popular question I see is “How much space is my SharePoint site using?”. Here’s how you find out for a complete Site Collection (unfortunately, you can’t easily do just do single sub-site, you need to do the whole Site Collection).

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Navigate to the top site in the Site Collection in question as an administrator.

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Select the cog in the top right of the window just to the right of your name.

From the menu that appears select Site Settings.

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In the Site Settings page locate the Storage Metrics option.

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You’ll find it at the bottom right under the Site Collection Administration section.

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That will take you to a summary page as shown above. In there you can see this size of things like Document Libraries, Lists, etc but you can also see the size of sub sites.

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The listed items are hyperlinked so if I click on the Document Library ‘Documents’ you’ll be shown the storage report for that element as shown above (i.e. all the documents stored inside it).

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If you select a sub site you will be shown a storage report for this area.

Thus, it is easy to look at the storage usage for a Site Collection and then start drilling down into specific areas.

You can do this for any SharePoint Online Site Collection you have INCLUDING OneDrive for Business.

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