Using PowerShell to determine SharePoint database size

Open the Sharepoint management shell

Then

Run the following command

To get list of databases

Get-SPDatabase

The following command to get list of every database used and its Size

Get-SPDatabase | Sort-Object disksizerequired -desc | Format-Table Name, @{Label =”Size in MB”; Expression = {$_.disksizerequired/1024/1024}}

To know how much total space is needed

Run the following

Get-SPDatabase | ForEach-Object {$db=0} {$db +=$_.disksizerequired; $_.name + ” – ” + $_.disksizerequired/1024/1024} {Write-Host “`nTotal Storage (in MB) =” (“{0:n0}” -f ($db/1024/1024))}