To figure out the dollar value per unit of alcoholic beverage. Examples of one unit of alcoholic beverage include: 1.5 oz of 80 proof vodka, 12 oz of beer with 5% alcohol, 5 oz of wine with 12% alcohol.
For the same price, a 750ml bottle of 100 proof SoCo alculates much better than a 750ml bottle of 80 proof SoCo.
SoCo and lime shots alculate horribly as they are 50% SoCo, 50% non-alcoholic lime juice. For better alculation, you are better off asking for the shot of 100% SoCo and squeezing a lime into it.
Mike is a genious for coming up with the term alculate.