I just checked with a measuring cup. The Black and Decker coffee maker
uses 4oz "cups". A full 12 cup carafe is 48 oz although I usually end
up filling it more than that. It actually holds closer to 14 "cups".
Taking this science fair project a step farther I weighed the normal
coffee charge and it is right at one oz by weight (Maxwell House drip
grind) for that pot of coffee. That makes a pot of coffee about 15
cents if you catch a sale. ($5.99 for 39 oz can)
I know when we charged a quarter a mug (4 cups or so) at our shop we
ended up with a tidy profit that we spent on a cookout lunch a few
times a year.
Damn. Now you've got me wondering.
Eight cups in my Starbucks pot is 48oz. So, Starbucks considers 6oz of
coffee to be a 'cup'. The coffeemaker we have holds 12 6oz cups, and
is called a 12 cup coffeemaker. I guess if it had a Black and Decker
label it would be an 18 cup coffeemaker.