This calc will estimate B.A.C.
FLUID OUNCES BY DRINK
Beer 12 oz. | Wine Glass 4 oz. | 1 Shot 1.5 oz
ALCOHOL PERCENTAGE BY DRINK
Beer 4-4.5% | Wine 15-20% | 1 Shot 30-50%
Ounces of alcohol is self explanatory, % of alcohol is either half of the proof, or marked on the label on wines/liquors. Most beer is 4%.
BAC = ((ounces of alcohol * % of alcohol by volume * 0.075) / persons
weight) - (hours of drinking * 0.015)
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