NutriBase

Crustaceans, Crab vs Mollusks, Oyster: 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, Oyster 68 kcal · 100 g

Key differences

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

Nutrient comparison (per 100 g)

Nutrient Crustaceans, Crab Mollusks, Oyster
Calories 83 kcal 68 kcal
Protein 17.9 g 7.1 g
Total Fat 0.7 g 2.5 g
Saturated Fat 0.2 g 0.6 g
Carbohydrate 0 g 3.9 g
Dietary Fiber 0 g 0 g
Total Sugars 0 g 0 g
Sodium 563 mg 112 mg
Potassium 259 mg 229 mg
Calcium 91 mg 45 mg
Iron 0.5 mg 6.7 mg
Magnesium 36 mg 54 mg
Vitamin C 3.3 mg 5 mg
Vitamin A 1 mcg 90 mcg
Vitamin D 0 mcg 0 mcg
Cholesterol 97 mg 55 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, Oyster

  • Protein 42.7%
  • Fat 33.6%
  • Carbs 23.7%

Frequently asked questions

Which has more calories, Crustaceans, Crab or Mollusks, Oyster?
Per 100 g: Crustaceans, Crab has 83 kcal, Mollusks, Oyster has 68 kcal.
Which has more protein, Crustaceans, Crab or Mollusks, Oyster?
Per 100 g: Crustaceans, Crab has 17.9 g of protein, Mollusks, Oyster has 7.1 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.