Started trying to improve the user interface

Quite a few of the reviews I got on the last ship said that I should add more of a UI, so now I started trying to do that. So far, I have tried Tkinter to create a GUI (Same as in my other project Bible Clock), but it is harder than I expected. I have dropdown menus working so far and am (sometimes) able to get the unit into the code, but the number input fields are not doing what it seems like they should.
I looked at creating a website, but I don’t know JavaScript and I will need that to create a dropdown menu and do the math.
Maybe I will end up learning JavaScript instead of learning Tkinter :)