How to convert bytes to GB vbscript??

Hi I need to find the total size of my C: partition and how much free space it contains. For that I have written a vbscript which works fine but it shows the value of total size and free space in bytes. I need to show it in GB. How it can be done any help??
Below is my script,
strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Set colItems = objWMIService.ExecQuery("Select * from Win32_LogicalDisk",,48)
For Each objItem in colItems
    If objItem.Name = "C:" then
       Wscript.Echo "FreeSpace: " & objItem.FreeSpace
       Wscript.Echo "Name: " & objItem.Name
       Wscript.Echo "Size: " & objItem.Size
   End If
Next

Hi
You can query properties of the drive object (file system object) to enumerate the total, used and available space in bytes then convert the values to gigabytes. See the code below
Cheers Matt :)
Option Explicit
Dim objFSO, scriptBaseName
Dim drive, driveLetter, totalSize, freeSpace, usedSpace
On Error Resume Next
Set objFSO = CreateObject("Scripting.FileSystemObject")
scriptBaseName = objFSO.GetBaseName(Wscript.ScriptFullName)
driveLetter = "C:\"
Set drive = objFSO.GetDrive(driveLetter)
totalSize = drive.TotalSize
freeSpace = drive.FreeSpace
usedSpace = totalSize - freeSpace
If Err.Number <> 0 Then
WScript.Quit
End If
MsgBox driveLetter & " drive is " & FormatGB(totalSize) & " GB" & vbCrLf & _
driveLetter & " drive is using " & FormatGB(usedSpace) & " GB" & vbCrLf & _
driveLetter & " drive has " & FormatGB(freeSpace) & " GB available", vbInformation, scriptBaseName
On Error Goto 0
'Name : FormatGB -> Format Bytes to GigaBytes.
'Parameters : size -> Numeric value in Bytes.
'Return : FormatGB -> Numeric value in GigaBytes to two decimal places.
Function FormatGB(size)
FormatGB = FormatNumber(size / (1024 * 1024 * 1024), 2,0,0,0)
End Function

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