WHAT'S A STANDARD DRINK SIZE?
The simple answer: .6 fluid ounces of pure alcohol. The not so simple answer: You can’t drink pure alcohol. It’s flammable. And it tastes awful. Even vodka, which at 100 proof is often called hard liquor, is only 50% alcohol. Then you have to factor in the size of the pour or, in the case of beer, the size of the glass.
The point is, counting drinks isn’t a good way to keep tabs on how much you’re drinking. Volume is. But, with so many variables, that takes some math.
You could ask the bartender. He or she should know the strength of the drinks they serve. You could also do a little research. Find out how much alcohol goes into your favorite drinks.
But, no matter what you do, please know that one drink isn’t necessarily just one drink.