Typically I have found that a small brew is about 6oz, a medium brew is 8oz, and a large brew hits about 10oz. I believe each K cup is designed for a medium brew at 8oz making a small brew slightly stronger and a large one weaker. If you like a particularly light flavor, then you can use the same K-cup to brew two 6oz portions or even one 6 and one 8 to dilute the flavor. I wouldn't stretch the K-cup usage much beyond this though.
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I believe that the question was "how much coffee is in a K-cup." If this is truly the question, then the answer is 8.5 to 10 grams (.30 to .35 ounces) of ground coffee per K-cup, depending on the blend, roast, and manufacturer. For reference, two tablespoons of coffee - a popular amount recommended for a 6 ounce cup of coffee - weighs about .35 ounces).
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As much as I would love to stretch the amount of cups I can get out of one K-cup you probably could get a cup and a half in total. My family usually brews 1 k-cup for one very large cup. There are different settings on your Keurig machine that allow you to brew sizes from a shot to a large cup of coffee.