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Drink size calculator

Drink SizeDo you know how many “standard drinks” are in a:

  • 21-fluid ounce ballpark souvenir cup of light beer?
  • 40-fluid ounce bottle of malt liquor?
  • “half-pint” of 80-proof spirits?
  • 25-fluid ounce bottle of wine?

Chances are, your cup or beverage label won't tell you the answer—but this calculator will. See this drop-down menu for common container sizes and alcohol content for different beverages.

(The alcohol content of different types of beer, other malt beverages, and wine may vary.)

What's the
alcohol content
of the
(convert proof to alc/vol)

U.S. standard
drink size
(containing 14 g "pure" alcohol)

What's the
container size?
(convert to fl. oz.
if needed)

Number of
U.S. standard
drinks per

% alc/vol fl. oz fl. oz

Why is this information important?

Knowing standard drink sizes and the number of drinks per container can help you make informed decisions about your drinking. You’ll be able to:

Can't find your beverage on the menu?

To check beverages or container sizes not listed in the drop-down menu,  you can enter your own amounts into the calculator.  Here’s how:  

  • Find the alcohol content of the beverage. For all distilled spirits and most wine, the container label lists the percent "alcohol by volume" or alc/vol.  Many beer and malt liquor labels do not list this information, however. To find it, search online for the beverage bottler or other reliable sources.
  • Enter the alc/vol in the first column of the calculator.
  • Enter the container size in the third column of the calculator.

The calculator will show you how many standard drinks the container holds.

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A standard drink size may not reflect customary serving sizes. This calculator is for educational purposes only, to show how the standard drink size and the number of standard drinks per container varies depending on the alcohol content (% alc/vol) of different beverages and the container size. Any differences between the data you enter in the calculator and the actual amount in a drink or container could significantly affect the accuracy of the estimates. Because of this and individual variations in alcohol sensitivity and metabolism, the calculator should not be relied upon to predict blood alcohol level or any other measure. Do not drink if you are under the legal age (21 in the United States), and do not drive or engage in other potentially dangerous activities after drinking.