How do you measure efficiency? - Page 2 - Home Brew Forums

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04-20-2010, 06:59 PM   #11
WickedLB
Recipes

Jan 2010
Worcester
Posts: 108

Quote:
 Originally Posted by dcp27 Just a correction, those pre- and post-boil efficiencies are the same since the max would now be 1.069, not 1.054. Whichever time you have the most accurate volume and the wort is sufficiently mixed. Ideally, you should check it pre-boil though so you know if you need to add extract, sugar, etc to make up for bad numbers.
Excellent point and you are absolutely right. I have never looked at it these post-boil numbers since I learned that the pre-boil gravity is key to making adjustments. Thanks for the correction.
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04-20-2010, 11:07 PM   #12
ajf
Senior Member

Recipes

Oct 2005
Long Island
Posts: 4,646
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Just a small but important point.
Those posts that told you to divide one specific gravity by another (i.e. 1.062 / 1.069, or 1.042 / 1.054) are wrong. You have to subtract the 1.000 before doing the division (i.e. .062 / .069 or .042 / .054). Even easier, multiply the numerator and denominator by 1000 (i.e. 62/69 or 42/54)
The previous posters %ages were correct because they had subtracted the 1 before doing the division. They just didn't say that in the explanation.

-a.
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