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Old 10-14-2010, 08:22 PM   #1
Teufelhunden
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Default alpha acids

Hey guys, I am going to brew a recipe that calls for northern brewer hops 6.5% alpha acids. I looked on AHS website and can only find them at 10.4%. What is the best way to adjust?

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Old 10-14-2010, 08:57 PM   #2
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http://www.howtobrew.com/section1/chapter5-4.html

this should help you figure it out.
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Old 10-14-2010, 09:04 PM   #3
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From what I understand...

Weight x %AA = Weight x %AA
In your case that would be:
Weight X 6.5%AA = Weight x 10.4%AA

This essentially boils down to 6.5/10.4=0.625 or 5/8 of the called for weight.

If the recipe calls for 1oz of 6.5%AA hop, the you would use 5/8oz of 10.4%% hops.

Here is a IBU calculator that my be useful if you want to play around with the hop weights, %AA, and addition time.

http://www.rooftopbrew.net/ibu.php

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Old 10-14-2010, 09:05 PM   #4
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or plug them into a brewing calculator program, like Beersmith

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Old 10-14-2010, 10:38 PM   #5
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Only adjust the bittering add. The flavor and aroma adds are for the oils and oil levels are not impacted by AA %. You will be a little higher for the IBUs, but not by much.

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Old 10-15-2010, 01:06 AM   #6
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Thanks guys!!!

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