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Everyday nutrition

Dried Spirulina Seaweed: calories, macros and portion sizes

Published 20 October 2026 · BiteCal editorial draft

Dried Spirulina Seaweed provides 290 kcal, 57.5 g protein, 23.9 g carbohydrate and 7.72 g fat per 100 g in the USDA SR Legacy reference. The exact record is “Seaweed, spirulina, dried.” These are historical reference values for that food and preparation, not a measurement of every brand or recipe.

USDA reference per 100 g

Selected reference

Seaweed, spirulina, dried

calories290 kcal
protein57.5 g
carbs23.9 g
fat7.72 g
fiber3.6 g
sugars3.1 g
sodium1050 mg

Historical reference: USDA FoodData Central SR Legacy, April 2018. Values describe the named edible portion and preparation, not every food with a similar name or a current retail formulation. Missing values are not zero.

USDA FoodData Central · FDC 170495 ↗

USDA reference panel

NutrientPer 100 g
Energy290 kcal
Protein57.5 g
Carbs23.9 g
Fat7.72 g
Fiber3.6 g
Sugars3.1 g
Sodium1050 mg

What the nutrition record actually describes

The reference is USDA FoodData Central food 170495, from the April 2018 SR Legacy release. Its basis is per 100 g edible portion. Food names in search results can hide important differences: the record description, rather than the broad headline alone, determines whether this panel matches your serving.

The figures below are scaled from that source record. Missing nutrients are labeled “Not reported”; an absent sugar value is not evidence that a food contains no sugar. Values may be rounded, and a current product label takes precedence for that exact packaged product.

Powder portions are not meal-sized servings

The database entry represents dried spirulina. A supplement scoop or small amount added to a smoothie is far less than 100 g. The table is a reference for scaling, not a suggestion to consume a large quantity.

For a commercial powder, check the labeled serving and ingredient list. A blended green powder can contain several ingredients and should not inherit the composition of pure dried spirulina.

Calculated portion examples; not serving recommendations

Edible portionEnergyProteinCarbohydrateFat
25 g72.5 kcal14.4 g6 g1.9 g
50 g145 kcal28.8 g12 g3.9 g
75 g217.5 kcal43.1 g17.9 g5.8 g
100 g290 kcal57.5 g23.9 g7.7 g
150 g435 kcal86.3 g35.9 g11.6 g

How to calculate the portion on your plate

Multiply the per-100-g value by your edible portion in grams and divide by 100. A 75 g portion of this reference has approximately 217.5 kcal; a 150 g portion has approximately 435 kcal. Those are mathematical examples, not recommended serving sizes.

Use the same scaling for protein, carbohydrate and fat. For a mixed recipe, calculate each ingredient first, add the batch, then allocate the share eaten. If a finished batch weighs 600 g and you serve 150 g, you have one quarter of the batch nutrition; the recipe's water content affects its final weight.

Where the reference is useful—and where it stops

Use this panel to compare like-for-like portions and to understand what drives the meal total. It does not decide whether dried spirulina seaweed is suitable for a particular medical diet, nor does one nutrient describe the quality of an entire day.

A meal can include additional vegetables, grains, proteins, sauces and drinks. Record the components you ate rather than judging the plate from a single ingredient. If you need a sodium or other nutrient limit for a condition, use the plan agreed with your healthcare professional.

Logging dried spirulina seaweed with BiteCal

Photograph the meal in good light with the whole serving visible. Review the foods the scanner suggests, match the preparation, and adjust the portion before saving. Photo recognition is a starting estimate; it cannot read the weight under a pile of food or identify every hidden recipe ingredient.

Compare the saved calorie and macro totals with the reference and your portion calculation. Review the daily diary rather than assuming one scan is exact. A label or measured homemade recipe is often a better source when the product or recipe is known.

Frequently asked questions

How many calories are in 100 g of dried spirulina seaweed?

290 kcal in this specific USDA reference. Match the food description and preparation before applying that number to a meal.

Can I use the same number for a different brand?

Use the current product label if you have one. The historical USDA entry describes seaweed, spirulina, dried, so a different formulation or preparation may differ.

Why does my food diary show another value?

Check whether the entries use the same grams, preparation state, edible portion and source. A cooked item, dry ingredient and complete recipe can have different values even when their names look similar.

Sources

USDA FoodData Central: Seaweed, spirulina, dried (FDC 170495) ↗

BiteCal food reference methodology ↗

AI-assisted original draft. Editorial review pending. Sources describe their stated records or general principles. Current restaurant and branded-product figures require matching current information.

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