So, who is good with math? - Home Brew Forums

 Home Brew Forums > So, who is good with math?

04-29-2012, 02:47 AM   #1
Beer_Eugenics
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Jan 2012
Laredo, TX
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If I add 375ml of 180 proof whiskey to a 5 gallon batch how much would this raise my ABV. I came up with about 1.8%, sound right?

04-29-2012, 02:55 AM   #2
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Dec 2011
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I suck at math. Sorry! Curious what your trying to do though.

04-29-2012, 02:56 AM   #3
Beer_Eugenics
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Jan 2012
Laredo, TX
Posts: 258
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AHS Oaked Imperial Whiskey Stout

04-29-2012, 03:02 AM   #4
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Dec 2011
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Ok. Sounds like something I would try.

04-29-2012, 03:14 AM   #5
RiverCityBrewer

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Dec 2009
Cincinnati, OH
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Yeah I get 1.75%

04-29-2012, 11:25 AM   #6
boscobeans
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Apr 2012
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180 proof = 90%

90% of 375ml=337.5ml

5gallons=18.93 liters=18930ml

337.5 / 18930 = .0178 or 1.78%

bosco

04-29-2012, 12:24 PM   #7
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Jun 2011
Ham Lake, MINNESOTA
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We need to know the alcohol content of your beer before we can give you an accurate answer. The answers above are based on adding the alcohol to water, and fail to take into account any alcohol that may already be in the beer.

The differences are probably pretty minor, but to illustrate - if you were to pour the whiskey into a beer that was already 99% alcohol, you would actually be lowering the alcohol content of your mix. A silly example, but it proves the point.

So, if you want an accurate answer, we need to know the aldohol content of your beer before the addition. It probably won't make a 1/10% difference from what has already been submitted, but it is required to do the math correctly.

DJG

04-29-2012, 02:46 PM   #8
blakelyc
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Mar 2012
Bergenfield, New Jersey
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The calc above doesn't take into account the increase in total volume:

whiskey bump = 337.5 / (18930 + 375) =0.01745 or 1.745%

Teeny difference Assuming that the beer is lower, the current abv isn't necessary to calculate the bump, but would of course be necessary to calculate the final abv.

04-29-2012, 03:32 PM   #9
jeffjm

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Aug 2010
St. Louis, Missouri
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Not to digress, but what exactly is 180-proof whiskey and how is it different than everclear?

04-29-2012, 04:02 PM   #10
boscobeans
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Apr 2012
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Quote:
 Originally Posted by blakelyc The calc above doesn't take into account the increase in total volume: whiskey bump = 337.5 / (18930 + 375) =0.01745 or 1.745% Teeny difference Assuming that the beer is lower, the current abv isn't necessary to calculate the bump, but would of course be necessary to calculate the final abv.