pull down to refresh
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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Feedback:
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.