Quick answer: King Arthur Baking lists 1 cup of confectioners' sugar (unsifted) at 113 g, which works out to 113 g per US cup, 7.1 g per tablespoon and 2.35 g per teaspoon. So 100 g of confectioners' sugar (unsifted) is about 7/8 cup (0.88 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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Confectioners' sugar (unsifted): grams per cup
King Arthur Baking lists 1 cup of confectioners' sugar (unsifted) at 113 g, which works out to 113 g per US cup, 7.1 g per tablespoon and 2.35 g per teaspoon. So 100 g of confectioners' sugar (unsifted) is about 7/8 cup (0.88 cups).
Granulated sugars pack fairly consistently, so cup measures are more reliable than for flour; brown sugar is measured packed.
Grams to cups chart
Grams
Kitchen measure
Cups (decimal)
Tablespoons
25 g
1/4 cup
0.221
3.5
50 g
1/2 cup
0.442
7.1
100 g
7/8 cup
0.885
14.2
125 g
1 1/8 cup
1.106
17.7
150 g
1 1/3 cup
1.327
21.2
200 g
1 3/4 cup
1.77
28.3
250 g
2 1/4 cup
2.212
35.4
300 g
2 2/3 cup
2.655
42.5
400 g
3 1/2 cup
3.54
56.6
500 g
4 3/8 cup
4.425
70.8
1000 g
8 7/8 cup
8.85
141.6
Cups to grams
Volume
Grams
Ounces
1/4 cup
28 g
1 oz
1/3 cup
38 g
1.33 oz
1/2 cup
56 g
1.99 oz
2/3 cup
75 g
2.66 oz
3/4 cup
85 g
2.99 oz
1 cup
113 g
3.99 oz
1 tablespoon
7 g
0.25 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.
