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Old 06-16-2011, 03:13 AM   #1
scottyg354's Avatar
May 2011
Hazleton, PA
Posts: 420
Liked 23 Times on 16 Posts

Ok guys, quick question. Made a summer brew about two weeks ago. OG was supposed to be 1.051 but it wound up being 1.046. I think I might have taken my OG when the wort was still a little warm. This was a partial mash brew.

My question is how much does heat affect your OG.
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Old 06-16-2011, 03:16 AM   #2
SD-SLIM's Avatar
Jan 2011
Fort Worth, Texas
Posts: 1,205
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Here this should help: http://www.howtobrew.com/appendices/appendixA.html

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Old 06-16-2011, 05:53 AM   #3
May 2011
Studio City, CA
Posts: 82
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If the wort was still warm and you did a partial boil (diluted with cold water) then it's possible the wort wasn't fully mixed when you took your reading giving you a slightly inaccurate reading. But getting 1.046 when you were expecting 1.051 isn't bad and I wouldn't lose any sleep, your beer will be just fine. Since you mention a partial mash it's possible you didn't get the full conversion you were expecting. I know my first mashes were only about 60% efficient until I refined my technique, now I'm consistently at 75%. Monitor your next few mashes closely (take a hydrometer reading from the kettle) to determine what your efficiency is. That'll help you plan recipes better (i.e.use a little more grain if your efficiency is low).

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Old 06-16-2011, 11:15 AM   #4
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Hammy71's Avatar
Sep 2008
, Maryland, The Tax Me State
Posts: 5,908
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I've always enjoyed this calculator. Compensates for temps...and best of all, no math.


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