Enjoy the beer that you deserve.
In much of the United States and Australia, this term refers to a slightly curved glass of moderate capacity.
Typical volumes range from 10 to 15 ounces (285 to 425 milliliters).
In some places the term schooner can also refer to a large, goblet-shaped glass of great volume. So, to avoid miscommunication, first ask what schooner means locally before ordering.