Glad y'all liked the calc link. If it could be 'stuck' somewhere around here for reference, go ahead somebody.
BTW, there is a fantastic, global first-in-class calculation reference website called "Martindale's" or somesuch (IIRC, don't have the link at hand).
It has tens of thousands of calculation links available, in every field imaginable; a veritable Wiki for calcnuts.
I'll try and look it up and edit this post w/the link(s). I've always found it extremely useful, and have used it since the 1990's.