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What counts as "one drink"? PDF Print E-mail

All drinks are not created equal.

When you start to think about your drinking, you’ll want to start out by having a method of figuring out how many drinks you typically drink.

To do this, you’ll need to know one thing -- what makes up "one drink"?  Seems like a simple question, doesn’t it?  You might say that one beer is one drink, or one glass of wine, or even a single shot of hard liquor.  But, how big is that beer?  What kind of beer is it?  How high did you pour that glass of wine?  How much alcohol is in that shot? 

Believe it or not, there actually is a standardized way of measuring "one drink."

Defining a “Standard Drink”

In the United States, a standard drink is any drink that contains 0.6 fluid ounces (14 grams) of pure alcohol.  To give you a practical sense about what this looks like, take a look at the following chart:

1 Standard Drink

What affects the individual is the amount of actual alcohol in the drink, and not the type of drink itself.   It doesn’t matter whether you drink shots of hard liquor, a bottle of beer, or “just a glass of wine” – the result is the same if you are drinking the same amount of pure alcohol.  That means that drinking one glass of wine is the same as having one shot of whiskey.  Each one counts as “one drink.”

The Strength of a Drink

Another complicating factor is that the alcoholic content in the same types of drinks can actually vary quite a bit. 

  •  One beer is not always just one beer.  The number of drinks you have when you drink "a beer" depends entirely on the percentage of alcohol per volume for that kind of beer.  For example, a 12 oz. bottle of Labatt Blue contains about 5% alcohol, which is one standard drink.  The same size bottle of Bell’s Expedition Stout contains 10.5% alcohol.  That's more than double!  So, having one Bell’s is like having two Labatts, in terms of alcohol content.  Drink two of them in one night, and you've really had four drinks already.


  • "I just had one glass of wine. Why do I feel so tipsy?"  One glass of wine might not really be one drink.  Standard table wines, reds, and whites typically have 10 to 12% alcohol content.  But, these days wineries are getting pressure to intensify their flavors, which means riper grapes.  That means that many wines have higher alcohol content.  Some Chardonnays, Pinots, and Merlots can get as high as 15%.  Zinfendels can have as much as 20% alcohol.
  • Hard liquors can really vary alot.  While standard liquors like rum, whiskey, tequilla or vodka tend to contain 40% alcohol, some contain much more than that.  For example, Jack Daniel's contains about 40% alcohol by volume, while Booker's (made by Jim Beam Distilling) contains 62% alcohol!  Drinking one shot of Booker's is like drinking one and a half shots of Jack Daniel's, or 1.5 standard drinks.  Drinking two shots is three standard drinks. 
  • Mixed drinks can get even more confusing.  A rum and coke probably has enough rum to equal just one standard drink, but depending on your bartender, you could get as much as two or three drinks worth of rum.  A Long Island Iced Tea could have as many as five shots of different kinds of alcohol, which is the same as five drinks in one glass!

long island iced tea = five drinks

Don't Forget About Size!

The other thing to pay attention to is the size of your drink.  You might order a large glass of wine thinking that you’re getting a bargain, but the amount of alcohol in the large wine glasses can measure up to one third of a bottle! 

Take a look at what the standard amount of wine looks like in two very different wine glasses:


The first glass looks to be half full; that second glass looks almost empty, though.  And, they both contain the same amount of wine, and the same amount of alcohol.  It would be tempting to fill that second glass up much higher, but in doing so you'll be drinking more drinks.

If you’re interested in seeing how many standard drinks are in different sized containers, take a look at NIAAA’s Rethinking Drinking site.

Using the Standard Drink Measure

Now that you know what a standard drink is, you can use that to figure out how much you really drink.  Check out this page to try out a couple of tools that will help you to count the number of standard drinks you've been using.

Once you have done this, you are ready to estimate your drinking pattern.

Last Updated on Thursday, July 14, 2011 11:57 AM
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