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 Home Brew Forums > Attenuation
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02-05-2009, 03:24 AM   #1
beerthirty
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 Attenuation

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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primary- Tangerine Dream, SWMBO slayer,
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planning- Cru?
conditioning- 9/9/09 barleywine
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02-05-2009, 03:52 AM   #2
beerocd
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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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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
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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.

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