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 2 g in a 1/2 cup serving of sauerkraut is 8% of the first and 5% of the second. US food labels use a single Daily Value of 28 g instead, which puts this serving at 7%.
Calorie for calorie, the figure is 15.3 g of fiber per 100 kcal (this serving is 13 kcal). Among the 178 vegetables with USDA energy data here that is 2nd, and 3rd 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 sauerkraut alone would take 13 servings, and 38 g would take 19. Most days reach the target through several different sources.
Dietary fiber and energy in Sauerkraut for 100 g and the USDA household portions
Portion
Grams
Fiber
kcal
100 g
100
2.9 g
19
1/2 cup - this page's serving
71
2.1 g
13
1 cup
142
4.1 g
27
1 cup, undrained
236
6.8 g
45
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 1/2 cup serving of sauerkraut?
2 g of total dietary fiber, in a portion weighing 71 g. On a US label that reads as 7% of the 28 g Daily Value.
What is the fiber rank of sauerkraut in its food group?
By fiber per serving it is number 178 of 179 in its group in this database, and number 2 of 178 when ranked by fiber per 100 kcal.
How much fiber is there per 100 calories of sauerkraut?
15.3 g. USDA lists 2.9 g of fiber and 19 kcal in 100 g, and dividing one by the other gives the figure, whatever the portion.
How many servings of sauerkraut would cover a day's fiber on their own?
About 13 for the 25 g Adequate Intake for women aged 19 to 50, or 19 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 169279 (Sauerkraut, canned, solids and liquids, SR Legacy). For 1/2 cup that record gives 2.1 g of fiber; the 2 g used on this page is the site's reference figure. USDA nutrient data is public domain.