In North America, one standard drink corresponds to a typical 12 fl. oz. bottle of 5% Alcohol by Volume (ABV) beer, 5 fl. oz. of 12% ABV wine, or a 1.5 fl. oz. shot of 40% ABV liquor.[1] Due to the different size of the US and Canadian ounce however, the actual amount of alcohol is slightly different. In Europe the most common standard drink size is 10g of pure alcohol, making a typical 330ml bottle of 4.8% ABV beer correspond to 1.2 drinks or a 500ml bottle 1.9 drinks; 100ml of 11% wine is 0.9 drinks, and a 40ml shot of 33% spirits equal 1.0 drink, while in countries that use 12g, those same servings are 1.0, 1.6, 0.7, and 0.9 drinks respectively. Studies have shown that most people find it difficult to understand and define exactly what a standard drink is, and consistently underestimate how much they drink.[2]