How many ounces are in a coffee?

The standard serving size for a regular cup of coffee is typically 12 ounces, particularly in many coffee shops and restaurants, where a medium coffee is commonly defined as such. However, it's important to consider that coffee is often served in varying sizes, including 10, 14, or even larger 16-ounce cups in some venues.

In the context of the question, if the answer provided is 16 ounces, it suggests that the question may refer to a larger size often referred to in coffee shops as a "large" or "venti" size. This understanding is essential as it highlights that the definition of a coffee serving can vary significantly based on the establishment's sizing standards.

Therefore, recognizing serving sizes in the context of specific establishments or typical coffee formats is crucial for understanding the correct volume measurement associated with “a coffee.”