Changes
From BrewWiki
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)'''
