Quick script to get the size of all tables in all user databases in sql server. This reports the size in MB and truncates the decimal points. This uses SQLPSX, but could be easily converted to use SMO directly.
cls
Import-Module SqlServer
$outputs = @();
$dbs = Get-SqlDatabase -sqlserver "ServerName" | where{$_.IsSystemObject -ne $true}
foreach($db in $dbs)
{
foreach($table in $db.Tables)
{
$output = New-Object -TypeName PSObject -Property @{
Database = $db.Name
Schema = $table.Schema
Table = $table.Name
Size = [Math]::Truncate(($table.DataSpaceUsed * 1024) / 1MB)
}
$outputs += $output
}
}
$outputs | Sort Size -Descending | Format-Table -AutoSize
Sql Server Powershell 
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