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Alpha Acid Units

1 byte added, 03:12, 17 July 2006
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.
:'''AAU 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important factors such as the batch size, boil time and [[specific gravity]] of the [[wort]], AAU's have largely been replaced by [[International Bitterness Units]] which provide a much more accurate picture of the bitterness of a particular brew.