How do you calculate Alpha Acid Units (AAU) in hops?

Alpha Acid Units (AAU) are a measurement used to quantify the potential bitterness contribution of hops in brewing. The correct method to calculate AAU involves multiplying the weight of the hops used (in ounces) by the alpha acid percentage of the hops.

To elaborate, hops contain compounds known as alpha acids, which contribute to the bitterness of beer. The higher the percentage of alpha acids, the more bittering potential the hops have. By taking the weight of the hops (in ounces) and multiplying it by the alpha acid percentage (expressed as a decimal), brewers can determine the total bittering power contributed by that specific addition of hops. For example, if you have 2 ounces of hops with an alpha acid percentage of 5%, the calculation would be:

2 ounces x 0.05 (alpha acid percentage) = 0.10 AAU.

This straightforward calculation helps brewers adjust the hop quantities for achieving the desired bitterness level in their brews.