Calories in Blue Crabs For those looking to add more protein to their diets, 79.2 percent of the calories from crab meat comes from protein. A 3oz serving of blue crab meat is about 86.7 calories, which is 4.3 percent of the calories you can consume on a 2,000-calorie diet.Click to see full answer. Beside this, how many calories are in a whole crab?Dungeness Crab (Wild): (1 crab (127g) calories 140, calories from fat 14, total fat 1.57g, saturated fat >1g, trans fat 0g, cholesterol 97mg, sodium 480mg, total carbohydrate 1.2g, dietary fiber 0g, sugars 0g, protein 28.35g, vitamin a 2.6%, vitamin c 7.6%, calcium 7.5%, iron 3%.Secondly, is crab good for weight loss? A 3-ounce portion of crab contains only 98 calories, 1g of fat and a hefty 20g of lean protein. But if you are on a sodium restricted diet or struggle with high blood pressure, keep in mind that crab is one of the few foods that is naturally high in sodium. Furthermore, how many calories are in steamed crab legs? Alaskan King Crab Legs (Wild): (134g serving (or 1 leg), calories 130, calories from fat 18.5, total fat 2.06g, saturated fat 0g, trans fat 0g, cholesterol 71mg, sodium 1436mg, total carbohydrate 0g, dietary fiber 0g, sugars 0g, protein 25.93g, vitamin a >1%, vitamin c 1.7%, calcium 7.9%, iron 5.6%.Is Crab high in cholesterol?Shellfish. Shellfish such as oysters, mussels, crab, lobster, and clams contain large amounts of cholesterol, particularly in relation to their serving size. For example, King crab legs contain 71 mg of cholesterol per serving, lobster contains 61 mg per serving, and oysters contain 58 mg per serving.