According to the U.S. Food and Drug Administration, an eight-ounce cup of coffee contains between 80 to 100 milligrams of caffeine.

There are 128 fluid ounces in a gallon. Is distilled water safe to drink? Here's what to know about purified water. How many ounces in a pint? There are 16 fluid ounces in a pint.

Many cafes serve straight espresso as double shots rather than single shots, which comprise 2 fluid ounces. Regarding fluid ounces alone, it would take about eight espresso shots to fill a coffee cup.

So, for each cup, you just multiply the amount by 8 to get the total fluid ounces. For instance, to find out how many ounces are in 3 cups, you would multiply 3 x 8 to equal 24 fluid ounces.