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Old 06-20-2006, 12:02 PM   #1
Beer Snob
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Dec 2005
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I'm figuring out the alcohol of the stout I just made and always had a question.

SG was 1.032
FG (check to see if fermentation has stoped) was 1.010

Promash puts % by weight at 2.26
ProMash puts % by volume at 2.88

What is the difference between these two and which one do we use?

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Old 06-20-2006, 01:29 PM   #2
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Oct 2005
Oak Grove, Oregon, USA
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Alcohol is lighter than water, so an ounce (by weight) of alcohol is about 1.25 ozs. in volume. 3.2% by weight is 4.0% ABV. ABV sounds sooo much better when you are selling BMC, so legally that's how they are labelled.

I think just about everyone uses ABV.
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Old 06-20-2006, 05:53 PM   #3
Darth Konvel
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Sep 2005
Columbus, OH
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ABV is the defacto standard, but you'll see ABW mentioned in legal texts and by some brewers from time to time.
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