### Author Topic: Convert Hop Extract Grams AA to AAU or Pounds?  (Read 2847 times)

#### ultravista

• Brewer
• Posts: 409
##### Convert Hop Extract Grams AA to AAU or Pounds?
« on: April 09, 2015, 08:10:28 am »
A commercial recipe calls for 1500 grams AA of Warrior extract. Warrior ranges from 15.0 – 17.0% AA (Hop Union).

What is the formula to calculate AAU or pounds?

My goal is to determine the weight in pounds.

#### S. cerevisiae

• Guest
##### Re: Convert Hop Extract Grams AA to AAU or Pounds?
« Reply #1 on: April 09, 2015, 11:51:28 am »
While I may be wrong, the alpha percentage should be the percentage of the hop weight that is alpha acid resin.

1500g / 0.17 = 8.8 kilograms  x 2.20462 =  19.4 pounds
1500g / 0.15 = 10 kilograms x 2.20462 = 22 pounds
« Last Edit: April 09, 2015, 12:10:43 pm by S. cerevisiae »

#### a10t2

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##### Re: Convert Hop Extract Grams AA to AAU or Pounds?
« Reply #2 on: April 09, 2015, 11:58:32 am »
I'd cheat that up just a little bit - maybe 5% for pellets or 10% for whole cones to account for the better utilization from the extract.
« Last Edit: April 09, 2015, 12:53:46 pm by a10t2 »
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#### Stevie

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##### Re: Convert Hop Extract Grams AA to AAU or Pounds?
« Reply #3 on: April 09, 2015, 12:39:25 pm »
I found a recipe that called for hop shots and played with the numbers in my software to have the hop shot additions be .1oz = 1ml. Ended up being ~26% AA. I'm sure I would need to adjust for potency from batch to batch.

#### ultravista

• Brewer
• Posts: 409
##### Re: Convert Hop Extract Grams AA to AAU or Pounds?
« Reply #4 on: April 09, 2015, 08:27:20 pm »
the alpha percentage should be the percentage of the hop weight that is alpha acid resin

That makes sense. Did you find this on a hop grower/producer website?

#### ultravista

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• Posts: 409
##### Re: Convert Hop Extract Grams AA to AAU or Pounds?
« Reply #5 on: April 09, 2015, 09:00:39 pm »
The recipe explicitly calls for 1500 grams AA Warrior Extractand 45 grams AA Amarillo Extract.

#### a10t2

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##### Re: Convert Hop Extract Grams AA to AAU or Pounds?
« Reply #6 on: April 09, 2015, 09:02:47 pm »
the alpha percentage should be the percentage of the hop weight that is alpha acid resin

That makes sense. Did you find this on a hop grower/producer website?

That's the only way I've seen it written. Same as for hops, except extracts are typically 30-60% AA. The individual cans are sometimes labeled with total grams alpha acid.

Edit: So you want the mass of hop extract needed? You'd need to know the AA% for the individual batch of extract. Same math as with hops: 1500 g / %AA = mass of extract
« Last Edit: April 09, 2015, 09:05:06 pm by a10t2 »
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#### ultravista

• Brewer
• Posts: 409
##### Re: Convert Hop Extract Grams AA to AAU or Pounds?
« Reply #7 on: April 10, 2015, 08:05:23 am »
a10t2 - unfortunately, I do not know the AA% and have not been able to find Warrior Extract via the internet. I'll just have to approximate, or perhaps call Yakima or others.

#### S. cerevisiae

• Guest
##### Re: Convert Hop Extract Grams AA to AAU or Pounds?
« Reply #8 on: April 10, 2015, 09:06:03 am »
the alpha percentage should be the percentage of the hop weight that is alpha acid resin

That makes sense. Did you find this on a hop grower/producer website?

No, it is an American Society of Brewing Chemists standard.  Alpha and beta acids are weight by weight (w/w) measurements.

AA_weight / hop_weight  = AA_percentage

hop_weight * AA_percentage = AA_weight

AA_weight / AA_percentage = hop_weight

Essential oil (hop flavor and aromatic compounds) is a volume by weight (v/w) measurement. Essential oil profiles can be stated in v/w or percentage terms.  A rating of 1.2ml means that the cultivar yields 1.2 milliliters of oil per 100 grams of hops.   A rating of 1.2% also means that the cultivar yields 1.2 milliliters of oil per 100 grams of hops.

Example

http://www.barthhaasgroup.com/en/varieties-and-products/hop-varieties/51-popup/en