Hi Becky, 1 cup of flour weighs 120 grams. To calculate 1 2/3 cup, you can multiply 120 by 1.6666 (1 2/3 in decimal form) = 200 (rounded up from 199.99) grams. You can use this same approach when trying to calculate any measurement of flour. We hope that helps! Kye@KAF

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