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Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Hop AAU adjustment?
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Old 03-09-2012, 04:11 PM   #1
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Default Hop AAU adjustment?

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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Old 03-09-2012, 04:15 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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Old 03-09-2012, 07:58 PM   #3
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nice, thanks! At what point should I worry about adjusting the amount? What AAU difference...

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Old 03-09-2012, 08:00 PM   #4
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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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Old 03-09-2012, 08:26 PM   #5
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awesome. thanks for that link! Ive been looking for something like that!

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Old 03-09-2012, 08:33 PM   #6
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Quote:
Originally Posted by mikesalvo View Post
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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Old 03-09-2012, 09:35 PM   #7
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Please note that you SHOULD NOT adjust a recipe's flavor or aroma additions based on a different AA%. AA% is useful only for bittering. The flavors and aromas come from other compounds. So if your recipe calls for 1 oz of Cacades at 10 minutes, throw in 1 oz of Cascades at 10 minutes, regardless of the AA%. Of course this means you may need to readjust your bittering addition to keep the total IBUs the same, beyond your original adjustment for AA%.

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Old 04-05-2012, 07:49 PM   #8
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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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Old 04-05-2012, 08:29 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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Old 04-05-2012, 08:43 PM   #10
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Quote:
Originally Posted by mikesalvo View Post
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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