Originally By Tony Ackland
Yield from GrainsHow much alcohol can you expect to make, based on your Grain recipe ?. Check out Mash Effficiency and Yield which I have stolen in its entirety, from a posting from John Palmer which was sent to the rec.crafts.brewing discussion group. Sorry, but its still in imperial units (points/pound/gallon (ppg)).
Whats the differences between 6 row and 2 row barley ? Dick explains ..
Andrew adds ...
x p/p/g = x / 119.8264 p/g/l
1/2 kilo 2 row lager malt
3 kilos wheat flakes
17.5 litres of water
using the optimal column:
37 ppg for the 2 row is 37/119.8264 pgl, or .30878 pgl
36 ppg for the wheat flakes is .30043 pgl
500 gms x .30878 = 154.39
3000 gmx x .30043 = 901.29
1055.68 / 17.5 = 60.32 points
divide the actual number of points the mash yielded by 60.32 and you have your mash efficiency, just like using the original imperial rates in John Palmer's post.
It took me quite a while to find the correct conversion method so I thought it might help out someone else trying to do the same thing without thinking in imperial.
PS -- I assumed the author was using US Imperial units -- if you know that they were in fact UK units please let me know. The conversion factor in that case would be x/99.77633.