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 15.6 g in a 1 cup cooked serving of lentils is 62% of the first and 41% of the second. US food labels use a single Daily Value of 28 g instead, which puts this serving at 56%.
Calorie for calorie, the figure is 6.8 g of fiber per 100 kcal (this serving is 230 kcal). Among the 114 legumes & beans with USDA energy data here that is 10th, and 71st 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 lentils 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 Lentils for 100 g and the USDA household portions
Portion
Grams
Fiber
kcal
100 g
100
7.9 g
116
1 cup cooked - this page's serving
198
15.6 g
230
1 tbsp
12.3
1 g
14
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 lentils?
15.6 g of total dietary fiber, in a portion weighing 198 g. On a US label that reads as 56% of the 28 g Daily Value.
What is the fiber rank of lentils in its food group?
By fiber per serving it is number 12 of 114 in its group in this database, and number 10 of 114 when ranked by fiber per 100 kcal.
How much fiber is there per 100 calories of lentils?
6.8 g. USDA lists 7.9 g of fiber and 116 kcal in 100 g, and dividing one by the other gives the figure, whatever the portion.
How many servings of lentils 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 172421 (Lentils, mature seeds, cooked, boiled, without salt, SR Legacy), portion 1 cup. USDA nutrient data is public domain.