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

Could use the StrFormatByteSize64() API function to convert a long int to human readable size. This results in a more accurate value than truncating to meet the cmd environment's 32-bit limit. This API function supports values in the ranges from bytes and kilobytes to petabytes and exabytes.

(This script is a hybrid Batch + PowerShell script. Save it with a .bat extension.)

<# : batch portion
@echo off & setlocal

for /f "tokens=2 delims==" %%x in (
    'wmic logicaldisk where "DeviceID='C:'" get FreeSpace /value'
) do call :int2size FreeSpace %%x

echo %FreeSpace% free on C:

rem // end main runtime
exit /b

rem // batch int2size function
:int2size  
setlocal
set "num=%~2"
for /f "delims=" %%I in (
    'powershell -noprofile "iex (${%~f0} | out-string)"'
) do endlocal & set "%~1=%%I" & goto :EOF

: end batch / begin PowerShell #>
Add-Type @'
using System.Runtime.InteropServices;
namespace shlwapi {
    public static class dll {
        [DllImport("shlwapi.dll")]
        public static extern long StrFormatByteSize64(ulong fileSize,
            System.Text.StringBuilder buffer, int bufferSize);
    }
}
'@

$sb = new-object Text.StringBuilder 16
[void][shlwapi.dll]::StrFormatByteSize64($env:num, $sb, 16)
$sb.ToString()