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From BrewWiki
/* AAU */
if you added 1.5 oz of 13.25% Simcoe you would get 19.875 AAUs.
The AAU format is helpful for sharing recipes but does not give an accurate prediction of final bitterness.
AAUs are the easiest to calculate, but most brewers use IBUs. For normal strength beers you can approximate the IBUs in Tinseth simply by multiplying the AAUs by 3.5. Using the above example 4 AAUs x 3.5 = 14 IBUs.
==Tinseth==
