Quick answer: King Arthur Baking lists 1 cup of corn syrup at 312 g, which works out to 312 g per US cup, 19.5 g per tablespoon and 6.5 g per teaspoon. So 100 g of corn syrup is about 1/3 cup (0.32 cups).
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Corn syrup: grams per cup
King Arthur Baking lists 1 cup of corn syrup at 312 g, which works out to 312 g per US cup, 19.5 g per tablespoon and 6.5 g per teaspoon. So 100 g of corn syrup is about 1/3 cup (0.32 cups).
Sticky syrups measure more cleanly if the cup is lightly oiled first.
Grams to cups chart
Grams
Kitchen measure
Cups (decimal)
Tablespoons
25 g
1/8 cup
0.08
1.3
50 g
1/8 cup
0.16
2.6
100 g
1/3 cup
0.321
5.1
125 g
3/8 cup
0.401
6.4
150 g
1/2 cup
0.481
7.7
200 g
5/8 cup
0.641
10.3
250 g
3/4 cup
0.801
12.8
300 g
1 cup
0.962
15.4
400 g
1 1/4 cup
1.282
20.5
500 g
1 5/8 cup
1.603
25.6
1000 g
3 1/4 cup
3.205
51.3
Cups to grams
Volume
Grams
Ounces
1/4 cup
78 g
2.75 oz
1/3 cup
104 g
3.67 oz
1/2 cup
156 g
5.5 oz
2/3 cup
208 g
7.34 oz
3/4 cup
234 g
8.25 oz
1 cup
312 g
11.01 oz
1 tablespoon
20 g
0.69 oz
1 teaspoon
6 g
0.23 oz
Source: King Arthur Baking, Ingredient Weight Chart. Kitchen measures are rounded to the nearest common cup fraction.