Hello all. I'm relatively new to all grain brewing and have not quite mastered the efficiency calculations yet. I did find some calculators and such for this but I wanted to do it by hand as well. Here is what I did (please correct me if I'm wrong):
12 lbs Maris Otter Pale
0.5 lbs Brown Malt
0.5 lbs Special B Malt
0.5 lbs Chocolate Malt
I came out with a pre-boil gravity reading of 1.063 with 5.8 gallons.
I used Course Grind Dry Basis (CGDB) values for all the grains since the grains were only run through the grain mill once and the mill was somewhat old producing a courser grind...
80.73% x 46ppg x 12.0 lbs = 446 gravity points
75.07% x 46ppg x 0.5 lbs = 17.2 gravity points
-Special B Malt:
63.7% x 46ppg x 0.5 lbs = 14.6 gravity points
61.26% x 46ppg x 0.5 lbs = 14.1 gravity points
TOTAL = 491.9 gravity points
1.063 means 63 points/gallon x 5.8 gallons = 365.4 points
Therefore 365.4/491.9 gives me an efficiency of 74.3%?
ALSO... I didn't have a hydrometer when I was brewing so I wasnt able to take a sample of my post-boil OG... I saved a sample of the pre-boil which is how I got the value above. To get an estimate of my post boil OG, is this the correct calculation?
365.4 points/4.75 gallons = 76.9 points/gallon or a reading of 1.063?
Thanks for taking a look!