whats AAU

[smeggedup]

hi all

looking at this recipe

Sierra Nevada Celebration
=======================
11.5 lbs 2-row Pale Malt
1 lb Crstal Malt 35L
0.5 lbs CaraPils Malt

11 AAU Chinook 60 min
8.5 AAU Cascade 30 min

0.66 oz Cascade dry hop
0.66 oz Centennial dry hop

Wyeast 1056 American Ale or
White Labs WLP001 California Ale

Mash @ 156
Boil for 90 min


but not following the aau, never seen it what does it mean?

i'm more use to seeing recipes that tell you the hop additions by amount, aa, and time
i,e

20g bobek aa 6.5% for 60mins
could anyone simplifie this for me

cheers all

[Befuddler]

AAU = Alpha Acid Units

An Alpha Acid Unit (AAU), also called Homebrew Bitterness Units (HBU) is a measure of hops used - typically for a 5 gallon batch. It can be calculated simply by multiplying the percent alpha acid of the hops used by the number of ounces of hops. For example 3 ounces of 5% alpha hops would be equivalent to 15 AAUs.
AAUs = (hops_alpha_percent * hops_weight_oz)
Because AAU's do not take into account important factors such as the batch size, boil time and specific gravity of the wort, AAU's have largely been replaced by International Bitterness Units which provide a much more accurate picture of the bitterness of a particular brew.

[smeggedup]

so do you work out whts needed by
aau / aa = oz of hops requird

(aau divided by aa equals oz's of hops required