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Old 10-28-2012, 05:32 PM   #1
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Default whats my efficiency

This whole efficiency thing htconfuses the hell out of me. I brewed Slims Graham Cracker Ale 2.0 found here, http://www.homebrewtalk.com/f78/slims-graham-cracker-ale-2-0-a-342443/. My numbers are as follows

BIAB system. I had to sparge with one gallon of water to get to my preboil volume of 6.5 gallons.

Pre boil 6.5 gallons 1.047 using refractometer, no sugar added or bakers chocolate added

Pre Boil 6.5 gallons 1.061 with the 1lbd of brown sugar and baker’s chocolate

Post boil 5.5 Gallons 1.073 using refractometer.

Not sure which numbers to use in order to calculate my efficiency.

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Old 10-28-2012, 05:55 PM   #2
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Kind of hard to say what your efficiency was since I don't know the gravity contribution of the graham crackers. I would say you were probably somewhere in the mid to high 70's. To determine your efficiency, you need to know what the maximum gravity contribution is for the grains you are using. For this task, I use a table in Palmer's "How to Brew" which lists the approximate max points you will get from each grain. Then you just do the math. For instance, you had a pre boil gravity of 1.047 and a volume of 6.5 gallons. That's 47 x 6.5 = 305 points. Here are the max points for the grains you used. 2-row - 38 PPG, 80L - 34 PPG, Choc Malt - 28 PPG, Graham Crackers - Unknown. If the crackers didn't contribute any sugar (which I'm sure they do) you could easily determine your efficiency as follows.

Max points = 9 * 38 + (8/16) * 34 + (4/16) *28 = 366 points per LB per gallon. You ended up with 305 points so 305/366 = ~ 83% efficiency. That is actually lower, of course, since we don't know how many points the crackers contributed.

Hope that helps.

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Old 10-28-2012, 06:39 PM   #3
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I used an online calculator to figure out my efficiency and 83% is what it said, but that just seemed high to me. Wasnt sure if I was inputing the correct numbers or not.

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