One of the top requests we've received is to add smarter final gravity calculation on the recipe builder. And for good reason: nothing's more frustrating that planning a recipe to perfection and coming out with a different FG, hence ABV than you planned. Today we rolled out the first in a series of changes to make this calculation better. The recipe builder now takes mash temperature into account when calculating yeast attenuation, which in turn influences final gravity. To try it out, just visit the recipe builder: http://www.brewersfriend.com/homebrew/r ... alculator/ Add some fermentables and then add a mash step in the 145 to 165 range. You'll notice that the FG calculation starts to adjust itself based on this temperature. Please experiment with it and let us know how it's doing. In the analysis we've done, we've found it to be much more accurate, but we want to hear how it's working for all of you. This change is only for the desktop version of the calculator currently, but we'll be rolling out similar updates to the mobile apps soon. Prost!