NutriBase

Crustaceans, Crab vs Mollusks, Octopus: Nutrition Comparison

Compare calories, protein, fat, carbs, vitamins and minerals per 100 g. Values shaded green are generally the more favorable ones.

Fish & Seafood Crustaceans, Crab 83 kcal · 100 g VS Fish & Seafood Mollusks, Octopus 164 kcal · 100 g

Key differences

  • Mollusks, Octopus has more calories; Crustaceans, Crab is lower in calories.
  • Mollusks, Octopus has more protein per 100 g.
  • Mollusks, Octopus is notably higher in iron.
  • Mollusks, Octopus is notably higher in potassium.
  • Mollusks, Octopus is notably higher in vitamin c.

Nutrient comparison (per 100 g)

Nutrient Crustaceans, Crab Mollusks, Octopus
Calories 83 kcal 164 kcal
Protein 17.9 g 29.8 g
Total Fat 0.7 g 2.1 g
Saturated Fat 0.2 g 0.5 g
Carbohydrate 0 g 4.4 g
Dietary Fiber 0 g 0 g
Total Sugars 0 g 0 g
Sodium 563 mg 460 mg
Potassium 259 mg 630 mg
Calcium 91 mg 106 mg
Iron 0.5 mg 9.5 mg
Magnesium 36 mg 60 mg
Vitamin C 3.3 mg 8 mg
Vitamin A 1 mcg 90 mcg
Vitamin D 0 mcg 0 mcg
Cholesterol 97 mg 96 mg

Green highlighting marks the more favorable value where it applies (for example, more protein or less saturated fat). Neutral nutrients are not highlighted.

Data source: USDA FoodData Central. Values are per 100 g of edible portion and are reference figures — they vary by variety, preparation and brand. Last updated: 2026-04-30.

Crustaceans, Crab

  • Protein 91.5%
  • Fat 8.5%
  • Carbs 0%

Mollusks, Octopus

  • Protein 76.7%
  • Fat 12%
  • Carbs 11.3%

Frequently asked questions

Which has more calories, Crustaceans, Crab or Mollusks, Octopus?
Per 100 g: Crustaceans, Crab has 83 kcal, Mollusks, Octopus has 164 kcal.
Which has more protein, Crustaceans, Crab or Mollusks, Octopus?
Per 100 g: Crustaceans, Crab has 17.9 g of protein, Mollusks, Octopus has 29.8 g.

Compare with other foods

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Note. This information is provided for general reference only and is not medical advice or a diet prescription. If you have a medical condition or special dietary needs, consult a physician or a registered dietitian.