I loaded up the calculator and fooled around with it a little.
I haven't done batch calculations since college, back when computer time wasn't easy to come by. I remember thinking it'd be cool to get the calculations put into my brother's programmable calculator to streamline the process, but of course I never did it.

Still, Dave's calculator looks nice, and being open source helps with someone like me who isn't going to make any money off of my work for some time to come, if at all.
A couple of questions, though.
there's a lot of colorants left out of the tables. How hard would it be for a dope like me to add them?
I'm going to start out using SPB color base. I got the stuff so long ago, I have little info on what's in it. Without stepping on any large and sore toes, I wonder if there'd be a way to insert this formula in there? Maybe the batch calculator is something better to use with a fresh formula, or the one dave so helpfully included with the spreadsheet.
I'm still working from theory on all this, as I have to build a barn to house my studio before I can start melting anything.
If only the ground would dry up a little so I can start the foundation.
Still, I can start gathering up the knowledge and practice with formulation in the meantime