Alcohol by weight (ABW) is the measurement of the alcohol content of a solution in terms of the percentage weight of the alcohol in the solution.
Since most of us are accustomed to thinking of beer in terms of alcohol by volume, you may find it beneficial to convert the two. To convert ABW to ABV, multiply the ABW by 1.25. For instance, an ABW of 5 equals an ABV of 6.25%. To convert ABV to ABW, you would multiply the ABV by .8.