Fennel serving size, cups to grams
Here a serving of fennel is counted as 1 cup (sliced), which USDA weighs at 3.1 oz (87 g), with 23 calories and 0.8 g protein. 100 g (3.5 oz) is about 1 1/8 cups.
Serving sizes of fennel
Every household measure USDA weighs for this food, plus 1 oz and 100 g.
| Measure | Weight | Calories | Protein | Carbs | Fat |
|---|---|---|---|---|---|
| 1 cup, sliced | 3.1 oz (87 g) | 23 calories | 0.8 g | 4.8 g | 0.12 g |
| 1 bulb | 8.3 oz (234 g) | 63 calories | 2.2 g | 12.8 g | 0.33 g |
| 1 oz | 1 oz (28 g) | 8 calories | 0.26 g | 1.6 g | 0.04 g |
| 100 g | 3.5 oz (100 g) | 27 calories | 0.92 g | 5.5 g | 0.14 g |
Cups to grams
USDA weighs 1 cup (sliced) of fennel at 87 g. Smaller cup measures follow from it.
| Measure | Weight | Calories |
|---|---|---|
| 1 cup | 3.1 oz (87 g) | 23 calories |
| 3/4 cup | 2.3 oz (65 g) | 18 calories |
| 2/3 cup | 2 oz (58 g) | 16 calories |
| 1/2 cup | 1.5 oz (44 g) | 12 calories |
| 1/3 cup | 1 oz (29 g) | 8 calories |
| 1/4 cup | 21.8 g | 6 calories |
Grams and ounces to cups
| Weight | Volume | Calories |
|---|---|---|
| 1 oz | 1/3 cup | 8 calories |
| 100 g (3.5 oz) | 1 1/8 cups | 27 calories |
| 1 lb (454 g) | 5 1/4 cups | 122 calories |
What 3.5 oz (100 g) of fennel looks like
3.5 oz (100 g) of fennel is 3.5 oz, or about 1 1/8 cups or 1/2 bulb. It has 27 calories, 0.92 g protein, 5.5 g carbs and 0.14 g fat. One bulb weighs 8.3 oz (234 g).
Keep exploring
Sources
Weights and nutrition: USDA FoodData Central, food portions and nutrients (FoodData Central, April 2026 release, accessed 2026-10-14)
- Raw fennel (bulb): Fennel, bulb, raw, FDC ID 2747655 (Foundation Foods, published 2025-12-18)
- Kitchen measures (1 cup = 16 tbsp, 1 tbsp = 3 tsp): NDSU Extension, Ingredient Substitutions (FN198, J. Garden-Robinson, April 2013 edition). https://www.extension.purdue.edu/extmedia/HHS/HHS-784-W.pdf (accessed 2026-10-12)
How we calculate: each household measure is the gram weight USDA lists for this food. Calories and nutrients are the USDA values per 3.5 oz (100 g) scaled to that weight. 1 oz = 28.35 g and 1 lb = 453.6 g. Cup fractions are rounded to the nearest kitchen measure. A dash (—) means USDA reports no value. How we verify.