The Dietary Reference Intakes set an Adequate Intake for total fiber of 25 g a day for women aged 19 to 50 and 38 g for men of the same ages. Measured against those, the 4.6 g in a 1 cup cooked serving of corn is 18% of the first and 12% of the second. US food labels use a single Daily Value of 28 g instead, which puts this serving at 16%.
Calorie for calorie, the figure is 2.8 g of fiber per 100 kcal (this serving is 152 kcal). Among the 178 vegetables with USDA energy data here that is 132nd, and 350th across all 957. The intakes above were derived from 14 g of fiber per 1,000 kcal, or 1.4 g per 100 kcal, so this food sits above the ratio a whole day of eating is meant to reach.
Getting all 25 g from corn alone would take 6 servings, and 38 g would take 9. Most days reach the target through several different sources.
Dietary fiber and energy in Corn for 100 g and the USDA household portions
Portion
Grams
Fiber
kcal
100 g
100
2.7 g
97
1 cup cooked - this page's serving
157
4.2 g
152
1 ear, small (5-1/2" to 6-1/2" long)
89
2.4 g
86
1 ear, medium (6-3/4" to 7-1/2" long)
103
2.8 g
100
1 ear, large (7-3/4" to 9" long)
116
3.1 g
113
1 ear, yields
77
2.1 g
75
Gram weights come from the household measures on the USDA record; fiber and energy for each portion are its per-100 g values scaled to that weight.
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How many grams of fiber are in a 1 cup cooked serving of corn?
4.6 g of total dietary fiber, in a portion weighing 157 g. On a US label that reads as 16% of the 28 g Daily Value.
What is the fiber rank of corn in its food group?
By fiber per serving it is number 91 of 179 in its group in this database, and number 132 of 178 when ranked by fiber per 100 kcal.
How much fiber is there per 100 calories of corn?
2.8 g. USDA lists 2.7 g of fiber and 97 kcal in 100 g, and dividing one by the other gives the figure, whatever the portion.
How many servings of corn would cover a day's fiber on their own?
About 6 for the 25 g Adequate Intake for women aged 19 to 50, or 9 for the 38 g set for men of those ages.
Per-100 g figures and portion weights on this page come from USDA FoodData Central record 168539 (Corn, sweet, white, cooked, boiled, drained, without salt, SR Legacy). For 1 cup cooked that record gives 4.2 g of fiber; the 4.6 g used on this page is the site's reference figure. USDA nutrient data is public domain.