Question about the relationship between OG and FG. - Home Brew Forums
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Old 06-05-2006, 08:18 PM   #1
Jwedel
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May 2006
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I brewed the Nothern Brewing's American Wheat Kit over the weekend.

I have an OG of 1.040.

This kit consits of:

6# LME Wheat Malt Syrup

1.0 OZ Tettnag (60m)
1.0 OZ Tettnag (1M)

Wyeast #1010

What FG should I expect? 1.020 or lower?



 
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Old 06-05-2006, 08:32 PM   #2
brackbrew
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Did the kit give you an estimated final gravity or estimated abv percentage? If you're going to use it to judge when fermentation is done, I'd take hydrometer reading every couple days (ever 4 or so) after you've put it into the secondary or after the first 10 days of fermenting, and wait until the readings don't change.

Good luck and BREW ON



 
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Old 06-05-2006, 08:36 PM   #3
Baron von BeeGee
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It depends to some extent on how fermentable your LME is (which depends on the brand). But, all things being equal, you can use the following equation for a guesstimate:

FG = OG - (Attenation * (OG - 1))/100

For your Wyeast 1010, Attenuation 74-78 (we'll say 76):

FG = 1.04 - ( 76 * 0.04) / 100 yielding:
FG ~ 1.010

In reality, I would expect anywhere from 1.008 - 1.014.

 
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Old 06-05-2006, 08:46 PM   #4
david_42
 
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The Baron has it pegged. I just use 1/4 of the OG as my target. Anything more than 1/3 is probably stuck.
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Old 06-05-2006, 10:41 PM   #5
Jwedel
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May 2006
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Thanks. I have learned a few things.

The Northern Brewer kit had generic directions.



 
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