King Crab Nutrition: A Complete Breakdown for Health-Conscious Seafood Lovers

If you've ever splurged on a plate of king crab legs and wondered whether they fit into your healthy lifestyle, the answer is a resounding yes. King crab is one of the most nutrient-dense proteins in the ocean, delivering impressive macros alongside a rich array of vitamins and minerals. Whether you're eating keto, following a paleo diet, tracking macros, or simply trying to make smarter food choices, king crab deserves a regular spot on your plate.

This guide breaks down everything you need to know about king crab nutrition. Calories, protein, fat, carbs, micronutrients, and how it stacks up against other popular seafood options. 

King Crab Nutrition Facts: The Numbers at a Glance

A standard 3 oz (85g) serving of cooked king crab contains approximately:

• Calories: 82 kcal

• Protein: 16g

• Total Fat: 1.3g

• Saturated Fat: 0.1g

• Carbohydrates: 0g

• Cholesterol: 45mg

• Sodium: 911mg

• Omega-3 Fatty Acids: 389mg (0.389g)

• Vitamin B12: 3.8mcg (158% DV)

• Zinc: 6.8mg (62% DV)

• Selenium: 38mcg (70% DV)

• Copper: 0.3mg (30% DV)

• Phosphorus: 230mg (18% DV)

These numbers tell a compelling story: king crab is a high-protein, low-calorie, zero-carb food with minimal fat. For context, that's roughly the same calorie count as a small apple,  except every one of those calories is working hard to fuel muscle repair, immune function, and metabolic health.

King Crab Calories: Lean Without Sacrifice

One of the most common questions health-focused eaters ask is: "Is king crab high in calories?"

At just 82 calories per 3 oz (85g) serving, king crab is one of the leanest protein sources available. Leaner than chicken breast (165 calories per 100g) and far leaner than beef. A generous restaurant portion of crab legs (around 8–12 oz of meat) typically comes in between 130–200 calories total.

The caveat to watch: how it's prepared. King crab served plain or with a squeeze of lemon is an exceptionally clean food. Drawn butter, rich sauces, or cream-based bisques can multiply the calorie count quickly. If you're calorie-conscious, serve your crab with herbs, citrus, or a light olive oil drizzle rather than ladling on the butter.

King Crab Protein: One of the Best Sources in Seafood

With 16 grams of protein per 3 oz (85g) serving, king crab is a protein powerhouse. To put that in perspective:

• Salmon: ~20g protein per 100g

• Shrimp: ~20g protein per 100g

• Chicken breast: ~31g protein per 100g

• King crab: ~16g protein per 100g (at nearly half the calories of chicken)

King crab provides high-quality protein your body can easily use. It contains all the essential amino acids needed to support muscle recovery, strength, and overall health, making it a great choice after workouts or for anyone trying to eat lean, satisfying meals.

Is King Crab Keto-Friendly?

Yes. King crab is one of the most keto-compatible proteins you can eat. Here's why:

• King crab contains virtually zero carbohydrates, making it an easy fit for a keto diet. A serving of plain crab meat provides lean protein without sugars or starches.

• While king crab is naturally low in fat, it's easy to balance on keto by pairing it with butter, olive oil, or other healthy fats.

The main thing to watch out for is imitation crab. Unlike real king crab, imitation crab (surimi) is typically made with starches and added sugars, which can add 15–17g of carbs per serving. For keto eating, stick with whole king crab legs or pure crab meat whenever possible.

King Crab Micronutrients: More Than Just Lean Protein

King crab isn’t just high in protein — it’s also packed with important vitamins and minerals that support energy, immunity, and overall health.

Zinc

King crab is an excellent source of zinc, providing approximately 62% of the Daily Value in a 3 oz (85g) serving. Zinc supports immune health, wound healing, hormone production, and healthy skin.

Selenium

A 3 oz (85g) serving of king crab provides approximately 70% of the Daily Value for selenium, an antioxidant mineral that helps protect cells from oxidative stress while supporting thyroid and immune function.

Vitamin B12

3 oz (85g) serving of king crab provides approximately 158% of the Daily Value for vitamin B12, making it one of the richest natural seafood sources of this essential nutrient. Vitamin B12 supports nerve function, red blood cell production, and energy metabolism.

Copper

King crab contains copper, a mineral that helps the body use iron properly and supports connective tissue and nervous system health.

Phosphorus

It’s also a good source of phosphorus, which plays an important role in bone strength, cellular repair, and energy production.

Is King Crab Healthy?

For most people, yes. King crab can be a very healthy addition to a balanced diet.

It’s high in protein, low in calories, naturally free of carbohydrates, and packed with important nutrients like zinc, selenium, and vitamin B12.

Heart Health

King crab contains omega-3 fatty acids and very little saturated fat, making it a good fit for many heart-conscious eating patterns.

Supports Muscle Maintenance

Because it’s rich in protein, king crab can help support muscle recovery, strength, and fullness after meals — especially useful for active adults or anyone trying to maintain lean muscle while managing calories.

Rich in Important Nutrients

The selenium, zinc, and B vitamins found in king crab help support immune function, energy production, and overall metabolic health.

A Note About Sodium

One thing to keep in mind is sodium. King crab can be relatively high in sodium, especially if it’s pre-cooked or processed in brine. If you’re watching your salt intake or managing high blood pressure, it’s best to enjoy crab in moderation and avoid adding extra salt during preparation.

King Crab vs. Lobster Nutrition: How Do They Compare?

Both are premium crustaceans, but they have different nutritional profiles. The following values are based on referenced serving sizes from ASMI and USDA nutrition data:

Calories:

• King crab: 82 kcal

• Lobster: 89 kcal

Protein:

• King crab: 16g

• Lobster: 18.8g

Fat:

• King crab: 1.3g

• Lobster: 0.9g

Carbohydrates:

• King crab: 0g

• Lobster: 1.2g

Sodium:

• King crab: 911mg

• Lobster: 423mg

Zinc:

• King crab: 6.8mg

• Lobster: 3.4mg

Vitamin B12:

• King crab: 3.8mcg

• Lobster: 1.4mcg

Key takeaways:

• Lobster is slightly higher in protein and lower in sodium.

• King crab significantly outperforms lobster in zinc and vitamin B12.

• Both are excellent, low-calorie proteins with negligible fat and carbs.

• If micronutrient density matters to you, king crab has a clear edge.

King Crab for Popular Diets

Keto / Low-Carb
With virtually zero carbohydrates and plenty of protein, king crab fits easily into keto and low-carb eating plans.

Paleo
As a minimally processed seafood rich in protein and minerals, king crab aligns well with paleo-style diets.

Whole30
Plain king crab is Whole30 compliant. Just be mindful of sauces, glazes, or seasoning blends that may contain sugar or other non-compliant ingredients.

Mediterranean Diet
Seafood plays a major role in Mediterranean-style eating, and king crab is a nutrient-rich option that pairs well with vegetables, olive oil, and fresh herbs.

Gluten-Free
Pure king crab meat is naturally gluten-free. However, imitation crab often contains wheat and other additives, so always check labels carefully.

Dairy-Free
King crab itself contains no dairy, making it suitable for dairy-free diets when served without butter-based sauces.

Diabetic-Friendly
Because it contains virtually no carbohydrates, king crab can be a good protein choice for people managing blood sugar levels.

How to Get the Most Nutrition from King Crab

Choose wild-caught king crab
Wild-caught king crab is known for its quality, rich flavor, and sustainable harvesting practices. It’s also the type most nutritional data is based on.

Steam or bake when possible
Gentler cooking methods like steaming or baking help preserve texture and flavor without adding unnecessary fats or sodium.

Pair it with fresh, nutrient-rich sides
Serving king crab with foods like lemon, vegetables, or leafy greens creates a more balanced meal and complements the crab’s natural richness.

Go easy on the butter
King crab is naturally lean, but heavy butter sauces can quickly increase calories and saturated fat. For a lighter option, try olive oil, herbs, garlic, or fresh lemon juice.

Choose whole crab over processed products
Crab cakes, dips, and imitation crab products often contain fillers, starches, added sodium, and lower-quality ingredients. Whole king crab legs or pure crab meat are usually the healthiest options.

The Bottom Line

King crab is more than a luxury seafood choice — it’s also an impressively nutrient-dense source of protein. With relatively few calories, zero carbohydrates, and high levels of nutrients like zinc, selenium, and vitamin B12, it fits well into a wide range of healthy eating patterns, including keto, paleo, Mediterranean, and low-carb diets.

Its combination of lean protein, rich flavor, and valuable micronutrients makes king crab a smart option for health-conscious seafood lovers looking for something both satisfying and nutritious.

Looking for premium king crab delivered to your door? Explore our selection of wild-caught king crab legs, responsibly sourced and shipped for peak freshness.

Sources

1. Alaska Seafood Marketing Institute (ASMI). Nutrition Information: Alaska Shellfish. Available at: https://www.alaskaseafood.org/health-nutrition/nutrition-information/#alaska-shellfish

2. Alaska Seafood Marketing Institute (ASMI). Alaska King Crab Nutrition Facts. Revised January 22, 2020. Available at: https://www.alaskaseafood.org/wp-content/uploads/King_Crab_Final_revised_1-22-20.pdf