yet again the US does weird af stuff:
The cup currently used in the United States for nutrition labelling is defined in United States law as 240 ml
Australia, Canada, New Zealand, and some other members of the Commonwealth of Nations, being former British colonies that have since metricated, employ a “metric cup” of 250 millilitres
Canada now usually employs the metric cup of 250 ml
Similar units in other languages and cultures are sometimes translated “cup”, usually with various values around 1⁄5 to 1⁄4 of a litre.
so let’s not base anything metric on what the US does
and as for cup sizes
https://en.wikipedia.org/wiki/Coffee_cup
Cafes use various sizes of coffee cups to serve mocha, lattes, and other coffee drinks. They are typically 225, 336, 460, and sometimes 570 ml
225ml = 7.61oz
336ml = 11.36oz
460ml = 15.55oz
which pretty much exactly matches up to the 8, 12, and 16oz standard cup sizes as i mentioned
if you walk into pretty much any cafe in the world that has a barista and not just a machine, you’ll be able to ask for an 8oz flat white and you’ll get roughly the same amount of beverage in the same sized cup








i don’t know what to tell you mate, but i have, and do this regularly: i travel to berlin yearly and drink multiple coffees per day when im there… they have them labelled as their size names, but they are 8oz-12oz sizes: what they call them is irrelevant; it’s the standard when buying the cups, so they are 8oz etc sizes
it’s also kinda irrelevant what a shot of espresso is: they come in 4oz cups… this is the standard that a cafe will give… a shot of espresso is a shot of espresso; the volume of liquid doesn’t really change, and you wouldn’t pay more for a larger amount without extra coffee anyway
for flat whites etc, the standard GLOBALLY is an 8oz cup with a single shot (or sometimes 2 depending on the bean - really that can vary depending on the cafe and how mild their beans are) full to the top with steamed milk… that’s it - there’s no ifs buts or maybes… it’s the same in germany, it’s the same in france, it’s the same in belgium, it’s the same in australia, and yes it’s the same even in the US
even starbucks behind their ridiculous names for their cups use standard cup sizes: a short is 8oz, a tall is 12oz, a grande is 16oz