Storage Metrics Show Different Numbers Than Admin Center: Root Cause and Fix

You open the SharePoint admin center and see your total storage used is 2.5 TB. But when you run storage metrics on a site collection, the numbers add up to only 1.8 TB. This discrepancy causes confusion when planning capacity or troubleshooting billing. The root cause is that the admin center counts storage differently than site-level metrics. This article explains why the numbers differ and how to get a consistent view.

Why the Admin Center and Storage Metrics Show Different Numbers

The SharePoint admin center calculates storage at the tenant level. It includes all data stored in all site collections, including the first-stage and second-stage recycle bins, version history, and metadata. Site-level storage metrics only count active files, list items, and current versions. The recycle bin is not included in the site metrics report.

Another factor is that the admin center refreshes storage data every 24 to 48 hours. Site-level metrics are calculated in real time when you run the report. If you check storage metrics right after deleting a large file, the site shows less used space, but the admin center still shows the old number until the next refresh cycle.

Version history also contributes to the difference. Each time a user edits a document, SharePoint saves a new version. The admin center counts all versions as storage. Site storage metrics only count the current version unless you specifically enable version history in the report.

First-Stage vs Second-Stage Recycle Bin

When a user deletes a file, it goes to the first-stage recycle bin. That file still counts toward tenant storage in the admin center. If an administrator deletes from the first-stage bin, the file moves to the second-stage recycle bin. That also counts. Site-level storage metrics ignore both recycle bins entirely.

Metadata and Thumbnails

SharePoint stores metadata for every file, such as title, author, and custom columns. It also generates thumbnail images for documents and pictures. The admin center includes this hidden data in the total. Storage metrics for a site do not show these hidden files.

Steps to Get Matching Storage Numbers

1. Check the admin center storage number
   Go to SharePoint admin center > Active sites. Look at the Storage column. This is the tenant-level number that includes recycle bins, versions, metadata, and thumbnails.
2. Run storage metrics on a specific site
   Navigate to the site. Click Settings (gear icon) > Site contents > Site storage metrics. This shows only active files and list items. Compare this to the admin center number for the same site.
3. Empty the recycle bins
   On the site, go to Recycle bin. Select all items and click Delete. Then go to Second-stage recycle bin and delete all items there. This removes files that count in the admin center but not in site metrics.
4. Delete old versions
   Go to the library where files have many versions. Click the ellipsis (…) next to a file, select Version history, and delete older versions. Or use PowerShell to delete versions in bulk. This reduces the admin center number.
5. Use PowerShell to get exact per-site storage
   Run Get-PnPSiteStorage -Connection $conn to retrieve the exact storage number that the admin center uses for that site. This includes recycle bins and versions. Compare this to the site metrics report.

What to Do When the Numbers Still Do Not Match

Storage metrics show more space than the admin center

This can happen if the admin center has not refreshed. Wait 48 hours and check again. If the problem continues, run a tenant storage report using the SharePoint Online Management Shell. The command Get-SPOSite -Limit all | Select Url, StorageUsageCurrent gives you the per-site storage that matches the admin center.

The admin center shows a site with zero storage but files exist

This happens when a site is in read-only mode or has a storage quota that is set to zero. Go to the admin center > Active sites > select the site > Settings > Storage limit. Set a value larger than zero. The admin center will update within 24 hours.

Storage metrics report is missing some libraries

Storage metrics only shows the top 20 largest items. If a library is not listed, it is below the threshold. Use PowerShell to get a full list: Get-PnPFolder -FolderRelativeUrl "Shared Documents" | Get-PnFProperty -Key StorageMetrics. This returns the exact storage for that library.

Item	Admin Center	Site Storage Metrics
Recycle bin (first-stage)	Counted	Not counted
Recycle bin (second-stage)	Counted	Not counted
Version history	Counted	Not counted
Metadata and thumbnails	Counted	Not counted
Refresh frequency	Every 24-48 hours	Real-time

You can now reconcile the storage numbers by emptying recycle bins, deleting old versions, and using PowerShell for accurate per-site data. Next, set up a monthly storage report using the SharePoint admin center > Reports > Storage to track trends. An advanced tip: use the Set-SPOSite -Identity -StorageQuotaWarningLevel command to get alerts before a site reaches its limit.