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Old 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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Old 08-18-2012, 12:29 AM   #12
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Quote:
Originally Posted by unionrdr View Post
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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Old 08-18-2012, 01:34 AM   #13
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Quote:
Originally Posted by bleme View Post
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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Old 08-18-2012, 01:53 AM   #14
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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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Old 08-18-2012, 02:03 PM   #15
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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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