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08-18-2012, 12:03 AM   #11
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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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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?
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08-18-2012, 01:34 AM   #13
BrewKnurd
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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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The coopers one adds 0.5% to account for the priming sugar addition, it's just a rough estimate.

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08-18-2012, 02:03 PM   #15
Revvy
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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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