Hops AAU equasion question

RotorHead6 · Sep 27, 2007

I have a recipe that I will be brewing this morning. The recipe calls for Hallertau Pellets 4.5% alpha acids. When I went to the local home brew shop they only had Hallertau 4.2% Alpha acid.

My question is how do I do the math to figure out how to add more/less hops to my brew? Thanks for the help.

Khirsah17 · Sep 27, 2007

The equation for calculating AAU is:

AAU = AA (%) X Hops (oz)

So in your case, if the recipe calls for 3 oz of Hallertau at 4.5% AA,

AAU = 4.5 X 3 = 13.5 AAU

So you can use that to solve what the amount of hops you need at 4.2% to still get you the same AAUs.

Hope that helps!

TexLaw · Sep 27, 2007

Just to finish that up:

Hops (oz) = AAU / AA (%)

So, Hops (oz) = 4.5/4.2= 1.07

So, you need 1.07 oz of 4.2% AA hops for every 1 oz of 4.5% hops in the recipe. In other words, you need a little more

TL

FSR402 · Sep 27, 2007

TexLaw said:
Just to finish that up:

Hops (oz) = AAU / AA (%)

So, Hops (oz) = 4.5/4.2= 1.07

So, you need 1.07 oz of 4.2% AA hops for every 1 oz of 4.5% hops in the recipe. In other words, you need a little more

TL

In other words, not enough more to bother figuring it out.

TexLaw · Sep 27, 2007

FSR402 said:
In other words, not enough more to bother figuring it out.

Yep. But, I miss doing arithmetic sometimes. :fro:

TL

Dude · Sep 27, 2007

I brought this up a LONG time ago....

...if nothing else, my first post has another explanation for the equation. The answers you've gotten so far suffice though. Just offering more.

https://www.homebrewtalk.com/showthread.php?t=2887

malkore · Sep 27, 2007

use two extra hop pellets

boo boo · Sep 27, 2007

1 oz of any hop at a AA rating is the AAU of that hop.

For instance 1 oz of 7.1 AA cascade would be 7.1 AAU's
1 oz of 6.3 AA cascade would be 6.3 AAU's

If you needed 7.1% AAU's of cascade and had 6.3% then you divide 7.1 by 6.3 to get 1.13 oz.

And if you had 7.1 and needed 6.3 then divide 6.3 by 7.1 to get .89 oz.

RotorHead6 · Sep 27, 2007

Thanks for all of the help. I successfully hopped da brew.

Hops AAU equasion question

Help Support Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum:

RotorHead6

Well-Known Member

Khirsah17

Well-Known Member

TexLaw

Here's Lookin' Atcha!

FSR402

Supporting Member

TexLaw

Here's Lookin' Atcha!

Dude

Supporting Member

malkore

Well-Known Member

boo boo

Well-Known Member

RotorHead6

Well-Known Member

Similar threads

Latest posts

Hops AAU equasion question

Help Support Homebrew Talk - Beer, Wine, Mead, & Cider Brewing Discussion Forum:

Well-Known Member

Well-Known Member

Here's Lookin' Atcha!

Supporting Member

Here's Lookin' Atcha!

Supporting Member

Well-Known Member

Well-Known Member

Well-Known Member

Similar threads

Join the conversation!

Join today and get all the highlights of this community direct to your inbox. It's FREE!