Do you want to set the default storage limit for a new SharePoint Online site? In this tutorial, I have explained step by step how to set default storage limit for new sites in SharePoint Online.
When you will create a SharePoint Online site from the admin center, by default the storage limit will appear as 25600 GB.

The storage limit for a SharePoint Online site is not ideal for everyone and we can easily change it.
We will see here, how we can set a default storage limit at the admin center level, so it will be applicable for new SharePoint sites.
How to set default storage limit for new sites in SharePoint Online
Now, let us see how to default the storage limit for a new SharePoint site from the SharePoint Online admin center.
Step-1: Open the SharePoint Online admin center. The admin center URL will be like the below:
https://<Your Tenant Name>-admin.sharepoint.com/
Example: https://tsinfotechnologies-admin.sharepoint.com/
Step-2: Then from the home page, click on the Settings menu from the left navigation. Then on the Settings page, click on Site creation like below:

Step-3: Then it will open the Site creation dialog box. Here change in the “Default storage limit for new sites” textbox. I have changed the storage limit for new sites to 200 GB.

Step-4: Now, when you will try to create a new SharePoint site from the admin center, you will see the default Storage limit is set to 200 GB.

This is how to set default storage limit for new sites in SharePoint Online.
Change storage quota of existing SharePoint Online sites
Now, let us see, how to change the storage quota for existing SharePoint Online sites.
Step-1: Open the SharePoint Online admin center. Then click on Sites -> Active Sites. This will display all the active sites created in SharePoint Online.
Step-2: Then select the particular site and click on Storage from the menu bar. This will open the Edit storage limit dialog box. Here you can see the Maximum storage for this site option. I have set it for 300 GB.

Once you click on the Save button, the storage quota is modified and changed.
Conclusion
Whenever you will create a new SharePoint site, it will take the default storage that will be available storage for your organization and set it on the SharePoint Online admin center.
Here I have shown your step-by-step, how to set the default storage limit for new sites in SharePoint Online and how to change the storage quota for existing SharePoint Online sites.
You may like the following SharePoint Online tutorials:
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I am Bijay a Microsoft MVP (8 times –Â My MVP Profile) in SharePoint and have more than 15 years of expertise in SharePoint Online Office 365, SharePoint subscription edition, and SharePoint 2019/2016/2013. Currently working in my own venture TSInfo Technologies a SharePoint development, consulting, and training company. I also run the popular SharePoint website EnjoySharePoint.com
Hi Bijay
How to set a default quota for all new sites in Sharepoint 2019