[ultravista]

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]

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

[a10t2]

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.

[Stevie]

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]

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]

The recipe explicitly calls for 1500 grams AA Warrior Extractand 45 grams AA Amarillo Extract.

[a10t2]

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

[ultravista]

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]

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