A typical coffee mug is usually 8 to 12 oz , with 12 oz being a very common everyday size. In coffee terms, a “cup” can mean less than a mug, since some sources use 4 to 6 oz for a brewed coffee serving.

Quick Scoop

  • Small coffee cup: about 4 to 6 oz.
  • Standard mug: about 8 to 12 oz.
  • Larger mug: about 12 to 15 oz or more.

Simple rule

If someone says “a mug of coffee,” they usually mean around 10 to 12 oz , unless the mug is clearly oversized.

Practical example

A mug labeled 12 oz is generally considered a standard coffee mug size, while a 15 oz mug is more of a large mug.