Quick answer: King Arthur Baking lists 1 cup of pastry flour at 106 g, which works out to 106 g per US cup, 6.6 g per tablespoon and 2.21 g per teaspoon. So 100 g of pastry flour is about 1 cup (0.94 cups).
Checked Oct 23, 2026. King Arthur lists 1 cup of all-purpose flour as 120 g. 100 g ÷ 120 g = 0.833 cup, which this converter shows as 0.833 cups and rounds to the nearest kitchen measure, 7/8 cup.
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Pastry Flour: grams per cup
King Arthur Baking lists 1 cup of pastry flour at 106 g, which works out to 106 g per US cup, 6.6 g per tablespoon and 2.21 g per teaspoon. So 100 g of pastry flour is about 1 cup (0.94 cups).
Flour weight depends heavily on how the cup is filled: spooning flour into the cup and levelling it gives a lighter cup than scooping straight from the bag.
Grams to cups chart
Grams
Kitchen measure
Cups (decimal)
Tablespoons
25 g
1/4 cup
0.236
3.8
50 g
1/2 cup
0.472
7.5
100 g
1 cup
0.943
15.1
125 g
1 1/8 cup
1.179
18.9
150 g
1 3/8 cup
1.415
22.6
200 g
1 7/8 cup
1.887
30.2
250 g
2 3/8 cup
2.358
37.7
300 g
2 7/8 cup
2.83
45.3
400 g
3 3/4 cup
3.774
60.4
500 g
4 3/4 cup
4.717
75.5
1000 g
9 3/8 cup
9.434
150.9
Cups to grams
Volume
Grams
Ounces
1/4 cup
26 g
0.93 oz
1/3 cup
35 g
1.25 oz
1/2 cup
53 g
1.87 oz
2/3 cup
71 g
2.49 oz
3/4 cup
80 g
2.8 oz
1 cup
106 g
3.74 oz
1 tablespoon
7 g
0.23 oz
1 teaspoon
2 g
0.08 oz
Source: King Arthur Baking, Ingredient Weight Chart. Kitchen measures are rounded to the nearest common cup fraction.
