Peridot, the answer is a definite yes. First go to
http://calibre.kovidgoyal.net/
Have a nose around, and then download Calibre. I appreciate that you will want to get up and running quickly. Calibre does the job quietly, without any fuss.
Have a go at it, and if you get into bother read the manual at
http://calibre.kovidgoyal.net/user_manual/
and particularly the FAQ at:
http://calibre.kovidgoyal.net/user_manual/faq.html#faq
There is a massive thread on the topic of lit to lrf here:
https://www.mobileread.com/forums/showthread.php?t=11618
The chances are you will be able to get going without too much reading of the above: I think the User Manual and the FAQ will have you converting to beat the band. If not the Calibre thread above has all the questions ever asked, plus a few more.