They say that 1 beer is equal to 1 glass of wine which is also equal to 1 shot of hard liquor. But where does this formula come from, and it is useful in practical settings? We explore the math of a standard drink in America.

Note: All the units and definitions are for American customary units. Other countries have different definitions of a standard drink. The formula of a standard drink is given to be educational to explain the definition, and as the video explains, it is very easy to drink a different amount based on variations in alcohol content and serving sizes.

Online drink calculator:
http://rethinkingdrinking.niaaa.nih.gov/ToolsResources/DrinkSizeCalculator.asp

The standard drink definition varies by country
http://en.wikipedia.org/wiki/Standard_drink

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