Hi there, George! While one cup of water (and many other liquids) weigh 8 ounces, because of the difference in density a cup of flour is lighter. We weigh our flour at 4 1/4 ounces or 120 grams per cup, so a scant cup of flour for maintaining a sourdough starter weighs in at 4 ounces. We hope this clarifies! Kindly, Morgan@KAF

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