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Home Brew Forums > Home Brewing Beer > All Grain & Partial Mash Brewing > Mash Efficiency/brewhouse Eff.
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Old 02-29-2012, 12:17 AM   #1
Rogueangel1212
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Default Mash Efficiency/brewhouse Eff.

Finished my first all grain batch last week and have been trying to calculate my mash/brewhouse efficiency. The part that is really throwing me off is that I added honey post boil and haven't figured out how to include it into the brewhouse. here is my grain bill and readings:
4 lbs Wheat Malt, 3 lbs Vienna Malt,1.5 lbs Flaked Wheat, 8.0 oz Honey Malt,
17 oz Honey

Pre-boil amount: 5.5 gallons
Pre-boil SG = 1.04 at 108 degrees (which I calculated to be 1.048)

FG= 1.053 at 95 degrees (1.058)
Post-boil amount: 5.5 gal

Thanks in advance!

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Old 02-29-2012, 04:28 PM   #2
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The honey will add about 7 points to the 5.5gal post-boil. Is that post-boil measured with the honey or without? and what was your pre-boil volume? I'm guessing that's a typo. With the honey for post-boil, I'm getting an 85% brewhouse efficiency. To calculate the mash eff, just take the honey out of the equation with your pre-boil vol.

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Old 02-29-2012, 04:37 PM   #3
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Taking a gravity reading before the addition of the honey, and then leaving the honey out of the equation would be the easiest answer for next time.

I want to calculate this for you, but I am forced to question why your pre and post boil volumes are the same.

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Old 02-29-2012, 04:51 PM   #4
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Originally Posted by tjpfeister View Post

I want to calculate this for you, but I am forced to question why your pre and post boil volumes are the same.
I was wondering this too. I don't think 17oz of honey would return the amount of boil off that should have occurred. Did you have a good boil?
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Old 03-01-2012, 02:10 PM   #5
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Pre and post boil volumes were 5.5 gal, I added a little bit of water to boil(and honey after the boil) and I was able to leave the lid on during the boil without it boiling over. (have since learned that I shouldn't do that) anyway this minimized loss of volume during boil and measured out to 5.5 gal. Post boil SG was after honey was added.

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