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How many grams is a cup of cake flour?

1 cup of cake flour weighs 120 grams (4.23 oz), according to King Arthur Baking — Ingredient Weight Chart.

Cake flour: cups to grams

AmountGramsOunces
1/4 cup30 g1.1 oz
1/3 cup40 g1.4 oz
1/2 cup60 g2.1 oz
2/3 cup80 g2.8 oz
3/4 cup90 g3.2 oz
1 cup120 g4.2 oz
1 tablespoon7.5 g0.26 oz
1 teaspoon2.5 g0.09 oz

US cup = 236.6 ml. Flour is spooned into the cup and leveled, not scooped.

FAQ

How many grams is 1/2 cup of cake flour?

1/2 cup of cake flour is about 60 grams, based on 120 g per US cup (King Arthur Baking — Ingredient Weight Chart).

How many grams is 1/4 cup of cake flour?

1/4 cup of cake flour is about 30 grams.

How many ounces is a cup of cake flour?

A US cup of cake flour weighs about 4.2 oz (120 g).

Why weigh instead of using cups?

Cups measure volume, so how you fill them changes how much you get. A kitchen scale gives the same amount every time, which is why bakers weigh.

Source: King Arthur Baking — Ingredient Weight Chart (120 g per US cup). Other amounts are calculated from that figure.