Feedback:
  1. it's a lot of text, then a button click to get to the calculator. I think I'd prefer to land at the actual calculator, rather than the "about" page.
  2. the form fields look like they already have values in them. The placeholder text makes me think it's already filled out. I'd either leave them blank or actually fill them with default values.
  3. the 3rd page is a lot of text.
Overall, I think it'd be better as a one page app, e.g. I arrive at the calculator, it has default values in it, and as I update the values, the results change dynamically.
Thanks for the feedback @k00b. I actually started with a one-page app but people were confused about why they should use it. So I added that welcome screen. However, you should only see it the first time you hit the page.
I may have over-corrected to a multi-step process in order to make it clear what is going on. I'll have to think about this a little more.
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