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 Home Brew Forums > Hop AAU adjustment?
03-09-2012, 03:11 PM   #1
mikesalvo
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I have a question about following recipes...

Lets say a recipe calls for 1 oz. of Cascade hops @ 9.6% aau. If I purchase cascade hops that are say 9.3%, should I adjust the amount? Also, which formula is best for doing this???? thanks!

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03-09-2012, 03:15 PM   #2
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with such a similar AA%, you wouldn't need to in this case. but the way to convert is multiply the AA% and weight for the recipe. 1 x 9.6 = 9.6. then divide that by the AA% of your hops, 9.6/9.3 = 1.03. so you'd need 1.03 oz of 9.3% cascades to = 1 oz of 9.6% cascades.
say you have a recipe that calls for 1 oz of 9.3% amarillo, but you have 10.4% amarillo, using the same math, you'd need .89 oz of the 10.4% amarillo for that recipe.

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03-09-2012, 06:58 PM   #3
mikesalvo
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nice, thanks! At what point should I worry about adjusting the amount? What AAU difference...

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03-09-2012, 07:00 PM   #4
Jayhem
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Just throw your recipe into http://beercalculus.hopville.com/recipe
and choose your AA% and it calculates it for you.

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03-09-2012, 07:26 PM   #5
mikesalvo
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awesome. thanks for that link! Ive been looking for something like that!

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03-09-2012, 07:33 PM   #6
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Quote:
 Originally Posted by mikesalvo nice, thanks! At what point should I worry about adjusting the amount? What AAU difference...
mainly bittering additions (early in the boil hop additions). AAUs are translated into IBUs by a function of AA%, time, and specific gravity.

As mentioned, AAUs are easy to caculate by hand; IBUs are not.

So, if you are targeting a specifc IBU #, you can use software to determine what you need based on the AA%/AAU.
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03-09-2012, 08:35 PM   #7
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04-05-2012, 06:49 PM   #8
mikesalvo
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At what point in the boil are the additions considered flavoring hops? With a 1.8-2% AAU difference between what I have ad what the recipe calls for, should I STILL not adjust my flavoring weights?

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04-05-2012, 07:29 PM   #9
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Here's one good example showing you what you get from different lengths of the boil.

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04-05-2012, 07:43 PM   #10
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Quote:
 Originally Posted by mikesalvo At what point in the boil are the additions considered flavoring hops? With a 1.8-2% AAU difference between what I have ad what the recipe calls for, should I STILL not adjust my flavoring weights?
Correct. If you're adding hops at 15 minutes, those are your flavoring hops. Adding more to adjust the IBUs means that you'd add more (or less) hops. The flavor is a complex thing, and IBUs really don't matter much as compared to the flavor you're getting.

I'd say any hops added at 20 minutes or less shouldn't be adjusted for AAUs, as they are for flavoring and aroma.
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