How can I convert this raw bytes output to GB?

Question

I\'m using the below code to output the current free space on the C: Drive. How can I convert the output from bytes to GB using batch?

@echo off
for /f \"use         


        

Answer 1

REM ECHO Disk Storage

for /f "tokens=1" %%d in (
 'wmic logicaldisk where drivetype^=3 get deviceid ^| find ":"') do ( 
    for /f "usebackq delims== tokens=2" %%x in (`wmic logicaldisk where "DeviceID='%%d'" get Size /value`) do set Size=%%x
    echo VolumeSize on %%d Partition = !Size:~0,-10!,!Size:~2,-8! GB >output.txt
    for /f "usebackq delims== tokens=2" %%x in (`wmic logicaldisk where "DeviceID='%%d'" get FreeSpace /value`) do set FreeSpace=%%x
    echo Freespace on %%d Partition = !FreeSpace:~0,-10!,!FreeSpace:~2,-8! GB >> output.txt
    echo.
    )
)