Attenuation - Home Brew Forums

 Home Brew Forums > Attenuation

02-05-2009, 03:24 AM   #1
beerthirty
big beers turn my gears

Recipes

May 2008
Podunk, VA. Not far from the NC line.
Posts: 2,589
Liked 34 Times on 14 Posts

I've tried the formula for calculating yeast attenuation and I must be doing something wrong. Its probably just a math mistake but I can't seem to figure this out. I'm hoping some one can help. The formula I'm using is OG-FG/OG.
Example OG 1.045- FG 1.011=.034/OG 1.045=.0325
What am I doing wrong here? I know my attenuation is not 32.5%. I've already searched but only come up with this same formula every time.
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 Originally Posted by the_bird "I've got a fever... and the only prescription is, MORE CARBOYS!"
primary- Tangerine Dream, SWMBO slayer,
serving- amber ale hop experiment #6, Roggenbier, apfelwine
planning- Cru?
conditioning- 9/9/09 barleywine
Drink water?... Never, fish fornicate in it.--- W.C. Fields
Most problems can be solved with the proper application of force.

02-05-2009, 03:52 AM   #2
beerocd
Recipes

Nov 2008
Posts: 697
Liked 5 Times on 5 Posts

34/45 = 75.6% apparent attenuation.
(OG - FG)/OG

-OCD
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02-05-2009, 02:09 PM   #3
menschmaschine

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Jun 2007
Delaware
Posts: 3,272
Liked 41 Times on 33 Posts

Yes, you have to use whole numbers, so just use the last two of each SG.
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02-06-2009, 06:36 AM   #4
beerthirty
big beers turn my gears

Recipes

May 2008
Podunk, VA. Not far from the NC line.
Posts: 2,589
Liked 34 Times on 14 Posts

Thanks, I knew it was something simple I was missing.
__________________
Quote:
 Originally Posted by the_bird "I've got a fever... and the only prescription is, MORE CARBOYS!"
primary- Tangerine Dream, SWMBO slayer,
serving- amber ale hop experiment #6, Roggenbier, apfelwine
planning- Cru?
conditioning- 9/9/09 barleywine
Drink water?... Never, fish fornicate in it.--- W.C. Fields
Most problems can be solved with the proper application of force.