This is a mathematical method for calculating the calorific value as a sum of the calorific values for the primary constituents in beer as determined through analytical methods.
Suitable for beer and other beverages
The energy or caloric value of beer is calculated according to Council Directive 90/496/EEC and is based on the amount of protein, carbohydrate, alcohol, glycerin and organic acids. For performing the calculation, caloric values are attributed to 1 g of each of the following: 17 kJ (4 kcal) of protein or utilizable carbohydrate, 29 kJ (7 kcal) of ethanol, 13 kJ (3 kcal) of organic acid, and 10 kJ (2.4 kcal) of higher alcohols. (Fat is not included in the calculation for beer.)
Calculations made on this basis demand a significant amount of analytical effort.
A simpler approach, which also suffices for routine analysis, is the calculation from the alcohol content (A) and real extract (ER) [1, 2]: