Beer
The calculation for beer is:
Where 1.05 is number of grams of ethanol produced for every gram of CO2 produced and .79 is the density of ethanol,
- ABV = ((1.05 * (Starting SG – Final SG)) / Final SG) / 0.79 * 100
However, many brewers use the following formula:
- ABV = (Starting SG - Final SG) * 131
Read more about this topic: ABV, Calculation of Alcohol Content
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