Quick answer: King Arthur Baking lists 1 cup of bread flour at 120 g, which works out to 120 g per US cup, 7.5 g per tablespoon and 2.5 g per teaspoon. So 100 g of bread flour is about 7/8 cup (0.83 cups).
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Bread Flour: grams per cup
King Arthur Baking lists 1 cup of bread flour at 120 g, which works out to 120 g per US cup, 7.5 g per tablespoon and 2.5 g per teaspoon. So 100 g of bread flour is about 7/8 cup (0.83 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
0.208
3.3
50 g
3/8 cup
0.417
6.7
100 g
7/8 cup
0.833
13.3
125 g
1 cup
1.042
16.7
150 g
1 1/4 cup
1.25
20
200 g
1 2/3 cup
1.667
26.7
250 g
2 1/8 cup
2.083
33.3
300 g
2 1/2 cup
2.5
40
400 g
3 1/3 cup
3.333
53.3
500 g
4 1/8 cup
4.167
66.7
1000 g
8 1/3 cup
8.333
133.3
Cups to grams
Volume
Grams
Ounces
1/4 cup
30 g
1.06 oz
1/3 cup
40 g
1.41 oz
1/2 cup
60 g
2.12 oz
2/3 cup
80 g
2.82 oz
3/4 cup
90 g
3.17 oz
1 cup
120 g
4.23 oz
1 tablespoon
8 g
0.26 oz
1 teaspoon
2 g
0.09 oz
Source: King Arthur Baking, Ingredient Weight Chart. Kitchen measures are rounded to the nearest common cup fraction.