Which has more calories, Crustaceans, Crab or Mollusks, Oyster?

Per 100 g: Crustaceans, Crab has 83 kcal, Mollusks, Oyster has 163 kcal.

Which has more protein, Crustaceans, Crab or Mollusks, Oyster?

Per 100 g: Crustaceans, Crab has 17.9 g of protein, Mollusks, Oyster has 18.9 g.

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 163 kcal · 100 g

Key differences

Mollusks, Oyster has more calories; Crustaceans, Crab is lower in calories.
Mollusks, Oyster 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.

At a glance

Crustaceans, Crab on the left, Mollusks, Oyster on the right. The longer bar holds more per 100 g; green marks the generally more favorable value.

Calories

83 kcal

163 kcal

Protein

17.9 g

18.9 g

Total Fat

0.7 g

4.6 g

Carbohydrate

0 g

9.9 g

Dietary Fiber

0 g

Total Sugars

0 g

Nutrient comparison (per 100 g)

Nutrient	Crustaceans, Crab	Mollusks, Oyster
Calories	83 kcal	163 kcal
Protein	17.9 g	18.9 g
Total Fat	0.7 g	4.6 g
Saturated Fat	0.2 g	1 g
Carbohydrate	0 g	9.9 g
Dietary Fiber	0 g	0 g
Total Sugars	0 g	0 g
Sodium	563 mg	212 mg
Potassium	259 mg	302 mg
Calcium	91 mg	16 mg
Iron	0.5 mg	9.2 mg
Magnesium	36 mg	44 mg
Vitamin C	3.3 mg	12.8 mg
Vitamin A	1 mcg	146 mcg
Vitamin D	0 mcg	—
Cholesterol	97 mg	100 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

Protein91.5%17.9 g
Fat8.5%0.7 g
Carbs0%0 g

Mollusks, Oyster

Protein48.3%18.9 g
Fat26.4%4.6 g
Carbs25.3%9.9 g

Frequently asked questions

Which has more calories, Crustaceans, Crab or Mollusks, Oyster?: Per 100 g: Crustaceans, Crab has 83 kcal, Mollusks, Oyster has 163 kcal.
Which has more protein, Crustaceans, Crab or Mollusks, Oyster?: Per 100 g: Crustaceans, Crab has 17.9 g of protein, Mollusks, Oyster has 18.9 g.

Compare with other foods

Crustaceans, Crab vs Alaska Pollock, Raw Crustaceans, Crab vs Anchovies, Canned In Olive Oil Crustaceans, Crab vs Cod, Pacific Or Alaskan Crustaceans, Crab vs Crustaceans, Crab Mollusks, Oyster vs Alaska Pollock, Raw Mollusks, Oyster vs Anchovies, Canned In Olive Oil Mollusks, Oyster vs Cod, Pacific Or Alaskan Pick a pair manually

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.