What is the definition of a cup of coffee My wife and I had a discussion in regards of my consumption of coffee during office hours. Health gurus always talk about a maximum amount of coffee during a day - measured in cups!

But what is the definition of 1 cup of coffee, and how much coffee is one cup?

We have several types of cups etc. at the office and at home, so its hard to know how many "cups" I drank over the day!
The most common global standard for recipe and marketing purposes** is 150 ml (5 oz), with a caffeine content around 100 mg. This commonly refers to instant, filter, or drip coffee, or a mixed espresso coffee like a latte

Coffee is traditionally served in a smaller cup than other hot beverages, mainly due to strength and expense. For example, an Italian espresso cup is around 30 to 60 ml (1 to 2 oz) in size, with a caffeine content a little more then 100 mg

Some references


http://www.ico.org/caffeine.asp
http://www.scaa.org/?page=resources&amp;d=cupping-standards


** e.g. marketing description of a "6 cup coffee maker" refers to 6 x 150 ml cups