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 3.6 g in a 1 cup raw serving of carrots is 14% of the first and 9% of the second. US food labels use a single Daily Value of 28 g instead, which puts this serving at 13%.
Calorie for calorie, the figure is 6.8 g of fiber per 100 kcal (this serving is 52 kcal). Among the 178 vegetables with USDA energy data here that is 45th, and 70th 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 carrots alone would take 7 servings, and 38 g would take 11. Most days reach the target through several different sources.
Dietary fiber and energy in Carrots for 100 g and the USDA household portions
Portion
Grams
Fiber
kcal
100 g
100
2.8 g
41
1 cup raw - this page's serving
128
3.6 g
52
1 cup grated
110
3.1 g
45
1 cup strips or slices
122
3.4 g
50
1 large (7-1/4" to 8-/1/2" long)
72
2 g
30
1 medium
61
1.7 g
25
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 raw serving of carrots?
3.6 g of total dietary fiber, in a portion weighing 128 g. On a US label that reads as 13% of the 28 g Daily Value.
What is the fiber rank of carrots in its food group?
By fiber per serving it is number 138 of 179 in its group in this database, and number 45 of 178 when ranked by fiber per 100 kcal.
How much fiber is there per 100 calories of carrots?
6.8 g. USDA lists 2.8 g of fiber and 41 kcal in 100 g, and dividing one by the other gives the figure, whatever the portion.
How many servings of carrots would cover a day's fiber on their own?
About 7 for the 25 g Adequate Intake for women aged 19 to 50, or 11 for the 38 g set for men of those ages.
The fiber figure on this page is reproduced exactly by USDA FoodData Central record 170393 (Carrots, raw, SR Legacy), portion 1 cup chopped. USDA nutrient data is public domain.