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 5.1 g in a 1 cup cooked serving of broccoli is 20% of the first and 13% of the second. US food labels use a single Daily Value of 28 g instead, which puts this serving at 18%.
Calorie for calorie, the figure is 9.4 g of fiber per 100 kcal (this serving is 55 kcal). Among the 178 vegetables with USDA energy data here that is 23rd, and 31st 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 broccoli alone would take 5 servings, and 38 g would take 8. Most days reach the target through several different sources.
Dietary fiber and energy in Broccoli for 100 g and the USDA household portions
Portion
Grams
Fiber
kcal
100 g
100
3.3 g
35
1 cup cooked - this page's serving
156
5.1 g
55
0.5 cup, chopped
78
2.6 g
27
1 stalk, large (11"-12" long)
280
9.2 g
98
1 stalk, medium (7-1/2" - 8" long)
180
5.9 g
63
1 stalk, small (5" long)
140
4.6 g
49
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 broccoli?
5.1 g of total dietary fiber, in a portion weighing 156 g. On a US label that reads as 18% of the 28 g Daily Value.
What is the fiber rank of broccoli in its food group?
By fiber per serving it is number 71 of 179 in its group in this database, and number 23 of 178 when ranked by fiber per 100 kcal.
How much fiber is there per 100 calories of broccoli?
9.4 g. USDA lists 3.3 g of fiber and 35 kcal in 100 g, and dividing one by the other gives the figure, whatever the portion.
How many servings of broccoli would cover a day's fiber on their own?
About 5 for the 25 g Adequate Intake for women aged 19 to 50, or 8 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 169967 (Broccoli, cooked, boiled, drained, without salt, SR Legacy). USDA nutrient data is public domain.