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 15 g in a 1 cup cooked serving of black beans is 60% of the first and 39% of the second. US food labels use a single Daily Value of 28 g instead, which puts this serving at 54%.
Calorie for calorie, the figure is 6.6 g of fiber per 100 kcal (this serving is 227 kcal). Among the 114 legumes & beans with USDA energy data here that is 11th, and 75th 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 black beans alone would take 2 servings, and 38 g would take 3. Most days reach the target through several different sources.
Dietary fiber and energy in Black beans for 100 g and the USDA household portions
Portion
Grams
Fiber
kcal
100 g
100
8.7 g
132
1 cup cooked - this page's serving
172
15 g
227
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 black beans?
15 g of total dietary fiber, in a portion weighing 172 g. On a US label that reads as 54% of the 28 g Daily Value.
What is the fiber rank of black beans in its food group?
By fiber per serving it is number 17 of 114 in its group in this database, and number 11 of 114 when ranked by fiber per 100 kcal.
How much fiber is there per 100 calories of black beans?
6.6 g. USDA lists 8.7 g of fiber and 132 kcal in 100 g, and dividing one by the other gives the figure, whatever the portion.
How many servings of black beans would cover a day's fiber on their own?
About 2 for the 25 g Adequate Intake for women aged 19 to 50, or 3 for the 38 g set for men of those ages.
The fiber figure on this page is reproduced exactly by USDA FoodData Central record 173735 (Beans, black, mature seeds, cooked, boiled, without salt, SR Legacy), portion 1 cup. USDA nutrient data is public domain.