A PowerShell Script to Determine Directory Size

Here's a script I wrote to determine the size (in megabytes) of all the files in a directory and its subdirectories. This should be a bit more accurate, if less precise, than what you get in Windows Explorer.

function GetSize()
{
  $size= gci -recurse -force | 
 ? { $_.GetType() -like 'System.IO.DirectoryInfo'} | 
 % {$_.GetFiles() } | 
 Measure-Object -Property Length -Sum |
 Measure-Object -Property Sum -Sum

  $size2 = (Get-item .).GetFiles() | 
  Measure-Object -Property Length -Sum

  [System.Math]::Round(($size.Sum + $size2.Sum) / 
    (1024 * 1024)).ToString() + "MB"
}