Is it possible in Windows to get a folder\'s size from the command line without using any 3rd party tool?
I want the same result as you would get when right clicking
I think your only option will be diruse (a highly supported 3rd party solution):
Get file/directory size from command line
The Windows CLI is unfortuntely quite restrictive, you could alternatively install Cygwin which is a dream to use compared to cmd. That would give you access to the ported Unix tool du which is the basis of diruse on windows.
Sorry I wasn't able to answer your questions directly with a command you can run on the native cli.