One drink isn't always one drink! Different types of alcoholic beverages contain different amounts of alcohol. Hence, it is important to know what a Standard Drink is.
Below is a table of Standard Drinks. Although they all differ in size, a Standard Drink has about 10 grams of alcohol. Labels on alcoholic drink containers state the number of Standard Drinks in the container.
Check the label to find out how many Standard Drinks are in a bottle or can. The Standard Drinks shown on this table are calculated to one decimal place.
If you get tricky numbers like 1.4 or 0.8 Standard Drinks, just round them to 1.5 and 1 to make it easier to count. Some people put the bottle caps or coasters in their pockets as a way of to help them count.