Powershell Calculated Properties

More for me than you.  I constantly have a need to convert bytes to GB or MB as an expression, yet I constantly forget how to do it.  Here is how:

gci -Path 'c:\' -Recurse -File | where{$_.Extension -eq ".bak"} | sort -Property Length -Descending | SELECT Name, @{Name="SizeGB";Expression={$_.Length / 1GB}} 
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