KelpNutrition reference
Seafood

Kelp

Kelp is a large edible brown seaweed with a mild, savory flavor, used in soups, salads, and side dishes. Per 100 g it provides 13 calories with 1.2 g protein and 2.1 g carbs.

13
kcalper 100g
Carbs
2.1g
Protein
1.2g
Fat
0.1g
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Nutrition facts

Per 100 grams

Reference values
Measurement basis
Food state
Raw
Edible portion
Fresh seaweed, trimmed
Measurement basis
Per 100 g raw edible portion
Energy (kcal)
13 kcal
Protein
1.2 g
Carbohydrates
2.1 g
Fat
0.1 g
Dietary fiber1
2.5 g
Sodium1
216 mg
More nutrients17
Energy (kJ)
54.4 kJ
Calcium1
80 mg
Potassium
6 mg
Magnesium
21 mg
Iron
0.9 mg
Zinc
0.1 mg
Vitamin B1
0.01 mg
Vitamin B2
0.01 mg
Vitamin B3
0.1 mg
Vitamin B6
0.5 mg
Vitamin B9 (folate)
38.2 µg
Vitamin B12
0.12 µg
Vitamin C
0.1 mg
Beta-carotene
142 µg
Alpha-carotene
38 µg
Vitamin E (alpha-tocopherol)
0.07 mg
Vitamin K1 (phylloquinone)
14.9 µg
  1. Additional data source[5]

Data sources

5
  1. 1

    CaloriePilot curated nutrition base

  2. 2

    台湾卫生福利部食品药物管理署

    F0710101 · Not reported

  3. 3

    日本文部科学省

    09017 · 日本食品標準成分表(八訂)増補2023年

  4. 4

    台湾卫生福利部食品药物管理署

    F07001 · Official dataset metadata updated2026-10-05; retrieved2026-10-16

  5. 5

    台湾卫生福利部食品药物管理署

    F07001 · 食品營養成分資料集;詮釋資料更新2026-10-05;2026-10-16下载

About this food

Understanding this nutrition reference

Kelp is a large, leafy brown seaweed that grows in cool coastal waters. It is eaten fresh, dried, or rehydrated in East Asian cooking, where it flavors soups and broths or is served as a seasoned salad or side dish.

Nutritionally, kelp is very low in calories and mostly water. Per 100 g it provides about 13 kcal, 2.1 g of carbohydrates, 1.2 g of protein, and 0.1 g of fat. This reference reflects plain kelp without seasoning.

Dried kelp weighs much less than fresh, and rehydrated kelp absorbs water. For accurate tracking, weigh kelp as prepared and note any seasoning or oil, and use the serving sizes below.

Plan your portion

How much is in your serving of Kelp?

Nutrition values are reported per 100 g. A typical 1 cup serving (about 80 g) provides roughly 10 kcal. Use the serving sizes below to estimate portions when logging.

Calculated from the per-100-g reference. Values are rounded.
ServingWeightCaloriesCarbsProteinFat
100 g100 g13 kcal2.1 g1.2 g0.1 g
1 cup chopped80 g10.4 kcal1.7 g1 g0.1 g
1/2 cup chopped40 g5.2 kcal0.8 g0.5 g0 g

Use the weight of the edible portion in the food state shown above.

Energy (kcal)
13 kcal
Energy (kJ)
54.4 kJ
Protein
1.2 g
Carbohydrates
2.1 g
Fat
0.1 g
Dietary fiber1
2.5 g
Sodium1
216 mg
Calcium1
80 mg
Potassium
6 mg
Magnesium
21 mg
Iron
0.9 mg
Zinc
0.1 mg
Vitamin B1
0.01 mg
Vitamin B2
0.01 mg
Vitamin B3
0.1 mg
Vitamin B6
0.5 mg
Vitamin B9 (folate)
38.2 µg
Vitamin B12
0.12 µg
Vitamin C
0.1 mg
Beta-carotene
142 µg
Alpha-carotene
38 µg
Vitamin E (alpha-tocopherol)
0.07 mg
Vitamin K1 (phylloquinone)
14.9 µg

Questions and answers

Kelp nutrition FAQ

How many calories are in kelp?

Kelp provides about 13 calories per 100 g. A typical 1 cup serving (about 80 g) provides roughly 10 calories.

Is kelp low in calories?

Yes. Kelp is mostly water and very low in calories, providing about 13 kcal per 100 g.

How is kelp usually eaten?

Kelp is used to flavor soups and broths or served as a seasoned salad or side dish. Dried kelp is often rehydrated before use.