Alcohol by weight

(ABW) Amount of alcohol in beer measured in terms of the percentage weight of alcohol per volume of beer, i.e., 3.2% alcohol by weights equals 3.2 grams of alcohol per 100 centiliters of beer. (It is approximately 20% less than alcohol by volume.) So a 7 percent ABW beer would be a 9 percent ABV beer. If for some reason you want to convert from ABV to ABW, multiply the ABV percent by 0.80.