batch file - 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 "usebackq delims== tokens=2" %%x in (`wmic logicaldisk where "DeviceID='C:'" get       FreeSpace /format:value`) do set FreeSpace=%%x
echo %FreeSpace%

Answer 1

Batch does not support float point arithmetic. This would be a nice workaround:

@setlocal enableextensions enabledelayedexpansion
@echo off

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

echo !FreeSpace:~0,-10!,!FreeSpace:~2,-8!GB

It only works if you run the .bat as administrator. It just inserts a dot after the 9. digits from the right, and trims the last 7. This is not exactly matching the value from windows, because 1k is here 1000 and not 1024

A better but more complex solution would be to use VBScript, described in the following article: Article