Alcohol measurement - Home Brew Forums

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05-27-2012, 02:28 AM   #1
fatnhappy
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May 2012
Estell Manor, NJ
Posts: 28
Liked 3 Times on 3 Posts

I, I made a nice KBS clone. I measured the starting and final gravity and it is 6.3 percent ( a little low for KBS I know). I added a cup of bourbon and oak chunks to it when it went into the secondary. How do I measure what alcohol percent of the beer now?

05-27-2012, 02:37 AM   #2
cshamilton
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Mar 2011
South Central Michigan, MI
Posts: 320
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If you check with a hydrometer you will get the correct FG but you won't have a true OG. So, you cannot measure it at this point without lab equipment.

But you CAN calculate it:

Volume of beer X alcohol % + Volume of bourbon X alcohol % and the divide by the new total volume.
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05-27-2012, 02:42 AM   #3
fatnhappy
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May 2012
Estell Manor, NJ
Posts: 28
Liked 3 Times on 3 Posts

Hi, I made a KBS clone. Took the starting and final gravity and it's 6.3 percent ( a little low for KBS I know). When I put it in the secondary, I added 1 cup of bourbon and oak chunks. How do I calculate how much alcohol the bourbon added to the beer?

05-27-2012, 03:03 AM   #4
CastleHollow

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Dec 2010
Midlothian, VA
Posts: 674
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If you check with a hydrometer you will get the correct FG but you won't have a true OG. So, you cannot measure it at this point without lab equipment.

But you CAN calculate it:

Volume of beer X alcohol % + Volume of bourbon X alcohol % and the divide by the new total volume.

05-27-2012, 12:23 PM   #5
cshamilton
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Mar 2011
South Central Michigan, MI
Posts: 320
Liked 20 Times on 18 Posts

Quote:
 Originally Posted by fatnhappy Hi, I made a KBS clone. Took the starting and final gravity and it's 6.3 percent ( a little low for KBS I know). When I put it in the secondary, I added 1 cup of bourbon and oak chunks. How do I calculate how much alcohol the bourbon added to the beer?
We gave you the formula! If you are confused, just ask. (There are some old threads too, so be sure to search).

OK - let's say your bourbon is 100 proof (50%). 1 gallon is 16 cups.

So for a 5 gal batch: ((80 x 6.3) + (1 x 50)) / 81 = 6.84%
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05-27-2012, 12:43 PM   #6
fatnhappy
Recipes

May 2012
Estell Manor, NJ
Posts: 28
Liked 3 Times on 3 Posts

Thanks for your help. Hope the beer is as tasty as KBS, one of my favs.