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Old 01-21-2013, 11:39 PM   #1
J-stone
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Jul 2012
, NW Oregon
Posts: 21



I did my first AG brew the other day and have a question. By the time I was done with my boil, I forgot to take my OG reading. I did however take a reading before boil. My before boil gravity was 1.038 at 6.75-7 US gal. After boil volume was 4.5 gal. (I got a little carried away and did not have a marked stick for my new unmarked kettle). Any help would be great.

Thankyou HomeBrewTalk.com for being the best resorce for begining brewers. I don't post much, but read alot on here, thankyou
Oh, not that it matters. . . but I only brew pilsners. . . just thought you should know.

 
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Old 01-21-2013, 11:42 PM   #2
dbsmith
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Feb 2011
Seattle, Wa
Posts: 414
Liked 27 Times on 19 Posts


Have no fear, those crazy chemists have made us a concentration/dilution formula:
c1v1=c2v2

(38)*(6.88 gallons) = c2 * (4.5 gallons)
c2 = 58.1

So your OG (post-boil) should be something around 1.058 (+/- .001)

 
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Old 01-22-2013, 03:05 PM   #3
J-stone
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Jul 2012
, NW Oregon
Posts: 21


Sweet! Thankyou sir. Now, off to find an efficiency formula

 
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