While reading through Kai Troester's blog (http://braukaiser.com/blog/) I came across some interesting work he did on yeast growth calculations. The best part is, Brewer's Friend has already taken his results and folded them into an online pitching rate calculator. If you're looking for an alternate to the MrMalty calculator, check this out.
http://www.brewersfriend.com/yeast-pitc ... alculator/