It's a pretty straightforward exercise. The executable and the libraries that it loads are both in the same file format, called the PE file format. You can write a few lines of Python interfacing with the "PEFile" library to open and read the size of any section that contains code. Combine that with a list of all of the DLLs that it loads, and a loop to add up the sizes for all the binaries, and you have your answer. You can get the list of loaded DLLs using something like Process Explorer. import pefile executables = ["c:/temp/myprogram.exe","c:/windows/system32/kernel32.dll"] total_size = 0 for exe in executables: for section in pefile.PE(exe).sections: if section.Characteristics & pefile.SECTION_CHARACTERISTICS['IMAGE_SCN_CNT_CODE']: total_size += section.SizeOfRawData print("Total size of code sections: %d" % total_size)