SharePoint Site Collection Quota Usage Report

Wanted to get a quick quota report on SharePoint sites on their allocation vs used space metrics to find out underutilized sites.

Here is the PowerShell script to get SharePoint site quota report:

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

Get-SPSite | Select URL,`
      @{Name="Site Owner"; Expression={$_.Owner.Email}},`
      @{Name="Quota Assigned"; Expression={"{0:N2} MB" -f ($_.Quota.StorageMaximumLevel/1MB)} } ,`
      @{Name="Storage Used"; Expression={"{0:N2} MB" -f ($_.Usage.Storage/1MB)}},`
   @{Name="Percentage Used"; Expression={"{0:P2}" -f (   ($_.Usage.Storage/1MB) / ($_.Quota.StorageMaximumLevel/1MB ))}}`
   | Out-GridView -Title " Quota Report"

Report Output:
Note that the "Infinity" has occurred on sites with No quota assigned!