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This little powershell function allows you to get the size of given folder. It has two parameters, -Name which takes file path as argument and -recurse which gets you size of the folders including the recursive items. For this powershell function -name is mandatory parameter and can take values from pipeline by property name.

function Get-FolderSize {
[CmdletBinding()]
param(
[parameter(valuefrompipelinebypropertyname=$true,mandatory=$true)]
$Name,
[switch]
$recurse            

)            

begin {}
process {
    if($recurse) {
        $colItems = (Get-ChildItem $name -recurse | Measure-Object -property length -sum)
        "Size of $name is -- " + "{0:N2}" -f ($colItems.sum / 1GB) + " GB"
    }
    else {
        $colItems = (Get-ChildItem $name | Measure-Object -property length -sum)
        "Size of $name is -- " + "{0:N2}" -f ($colItems.sum / 1GB) + " GB"
    }            

}
end {}
}

Output: