Check the size of SharePoint 2010 sites using PowerShell

Execute the below code under Powershell command prompt. Once you have run the script, you can call it with the following PowerShell command:

GetWebSizes -StartWeb <StartURL>




if ((Get-PSSnapin "Microsoft.SharePoint.PowerShell" -ErrorAction SilentlyContinue) -eq $null)
{
    Add-PSSnapin "Microsoft.SharePoint.PowerShell"
}
function GetWebSizes ($StartWeb)
{
    $web = Get-SPWeb $StartWeb
    [long]$total = 0
    $total += GetWebSize -Web $web
    $total += GetSubWebSizes -Web $web
    $totalInMb = ($total/1024)/1024
    $totalInMb = "{0:N2}" -f $totalInMb
    $totalInGb = (($total/1024)/1024)/1024
    $totalInGb = "{0:N2}" -f $totalInGb
    write-host "Total size of all sites below" $StartWeb "is" $total "Bytes,"
    write-host "which is" $totalInMb "MB or" $totalInGb "GB"
    $web.Dispose()
}
function GetWebSize ($Web)
{
    [long]$subtotal = 0
    foreach ($folder in $Web.Folders)
    {
        $subtotal += GetFolderSize -Folder $folder
    }
    write-host "Site" $Web.Title "is" $subtotal "KB"
    return $subtotal
}
function GetSubWebSizes ($Web)
{
    [long]$subtotal = 0
    foreach ($subweb in $Web.GetSubwebsForCurrentUser())
    {
        [long]$webtotal = 0
        foreach ($folder in $subweb.Folders)
        {
            $webtotal += GetFolderSize -Folder $folder
        }
        write-host "Site" $subweb.Title "is" $webtotal "Bytes"
        $subtotal += $webtotal
        $subtotal += GetSubWebSizes -Web $subweb
    }
    return $subtotal
}
function GetFolderSize ($Folder)
{
    [long]$folderSize = 0 
    foreach ($file in $Folder.Files)
    {
        $folderSize += $file.Length;
    }
    foreach ($fd in $Folder.SubFolders)
    {
        $folderSize += GetFolderSize -Folder $fd
    }
    return $folderSize
}