ArticleCalculating Alcohol Content, Attenuation, Extract, and Calories Learn how to calculate measures of extract, real and apparent attentuation, alcohol content and how many calories are in your beer.Already a member? Log InWritten by Bill PierceYou'll Also Like Article MEMBERS ONLY It's Complicated: Understanding oxygen in brewing Oxidation has negative connotations in all areas of brewing except one. Learn how oxygen finds its way into our beer and some of the keys to controlling it. Article MEMBERS ONLY Testing Your Hypothesis: Experiments you should do Homebrewing and experimenting are about as old as brewing itself . . . but modern scientific method delineates theories and proven facts. Denny and Drew provide some pointers.