title_body: Convert/Send Standalone EPUB from PC to Kindle via Menu/Command Line
upvoted_answer: You could use the Calibre ebook-convert command line utility. The following simple batch file should do the trick:
  
  FOR %%f IN ("*.epub") DO (ebook-convert "%%~nf.epub" "%%~nf.azw3")
  FOR %%f IN ("*.azw3") DO (copy "%%f" "E:\documents")
  
  
  (The script assumes that your Kindle is mounted as the E: drive; change the drive letter if it isn't the E: drive.) 
  
  Copy the two lines to a text file, save it with a .cmd or .bat extension in the same folder as the .epub files and then double-click it.