Originally Posted by d_striker
I don't understand the second part:
If (initial cells between 1.4 and 3.5 Billion / gram extract)
yeast growth is 2.33 - 0.67 * Billion initial cells per gram extract
Assuming the same inputs as above:
The BF calculator says that there would be 155B cells of new growth; not 189B.
Please correct me if I am wrong here, but it seems the OP is having trouble with the math more than the theory.
Two things look like they are going on here. First, I think you're missing the order of operations. Second the billion initial cells per gram extract is not the same as grams extract.
Say you were pitching 100 billion cells into that litter of 1.040 wort. That would be 100/114 = 0.877 billion cells per gram extract putting you in the first range. If you pitched 200 billion cells it would be 1.75 billion cells per gram extract putting you in the second range.
0.67 * 1.75 = 1.17, 2.33-1.17= 1.16 billion cells grown per gram extract.
1.16*114 = 132 billion cells grown.