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A standard drink is 12 fluid ounces of 5% ABV or the equivalent (6 fluid ounces of 10% ABV, 1.5 fluid ounces of 40% ABV, etc.).A 16 oz. pour of an 8% IPA is actually approximately 2.13 drinks. To calculate how many standard drinks are in a given serving of alcohol, I find it easiest to multiply the serving size in fluid ounces by the ABV (as a whole number, not a percentage) and divide by 60.