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08-18-2012, 12:03 AM   #11
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Aug 2011
Portland, Oregon
Posts: 465
Liked 24 Times on 21 Posts

I don't remember where I saw it, but I use this one:

(OG - FG) x 131.25 =
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08-18-2012, 12:29 AM   #12
bleme

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Jan 2012
Visalia, CA
Posts: 2,142
Liked 331 Times on 240 Posts

Quote:
 Originally Posted by unionrdr Not in my experience. I've used their formula & got 4.5% as well.
I think you may have typed it wrong or something. Try it with 1.050 OG and 1.010 FG (fairly common readings). That works out to about 5.2% with Revvy's formula but .5067 with Coopers. What is that supposed to mean?

08-18-2012, 01:34 AM   #13
BrewKnurd

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Mar 2011
Prairieville, LA
Posts: 2,763
Liked 245 Times on 203 Posts

Quote:
 Originally Posted by bleme I think you may have typed it wrong or something. Try it with 1.050 OG and 1.010 FG (fairly common readings). That works out to about 5.2% with Revvy's formula but .5067 with Coopers. What is that supposed to mean?
I think with the Coopers version you would use just the last 3 digits, without the decimal. i.e. your example would be 50-10 instead of .050-.010.
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08-18-2012, 01:53 AM   #14
Gab1788

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May 2011
Springwood, Nsw
Posts: 77
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The coopers one adds 0.5% to account for the priming sugar addition, it's just a rough estimate.

08-18-2012, 02:03 PM   #15
Revvy
Post Hoc Ergo Propter Hoc

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Dec 2007
"Detroitish" Michigan
Posts: 40,941
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The one that I posted is the one most commonly cited, and used. Whether it's the most accurate or right, almost is irrelevant. Because it's the formula most accepted (and listed by folks like Palmer and Papazian.) Therefore if you are brewing a recipe in a book or on a website, more than likely it was the formula the creator used to determine the abv for his recipe.
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