How much coffee and water should I use when brewing different batch sizes?
Use 1 Ninja Scoop (equivalent to 1 tablespoon) of coffee grounds per cup of coffee. For example, 2 cups requires 2 scoops filled to the 2-cup water line, and 12 cups requires 12 scoops filled to the 12-cup water line. For batches of 4 cups or fewer, make sure to press the SMALL BATCH button. (Page 9)
From the official Ninja Ce251 manual, page 9
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