Originally Posted by homebrewdad
I keep reading that the formula is (OG - FG) * ~131... and I have seen 131.25 several times as the more accurate number.
I've also seen a couple of references to 129.
Using my 131.25 gives you an ABV of 4.86%... which is close enough to passedpawn's number as to not matter one whit.
Maybe it's 131
That was from memory. In fact, I know I've done that exact thing before (wrong multiplier). Sorry.
You know, I always just look at the OG to know what the final ABV is going to be. I.e., this one should be about 5.1% (1.051
). Mathematically, if you assume 76% attenutation, my shortcut works perfectly.