A 3-ounce serving of plain cooked lobster (about 85 grams, weighed without the shell) contains roughly 64 to 81 calories. That makes lobster one of the lowest-calorie protein sources you can eat. A full cup of boiled or steamed lobster meat (145 grams) comes in at about 129 calories with 27.6 grams of protein, virtually zero carbohydrates, and only 1.3 grams of fat.
Calories by Serving Size
Most calorie counts you’ll see for lobster assume plain preparation: steamed, boiled, or broiled with no added butter or sauce. Here’s how the numbers break down by portion:
- 3 ounces (85g) without shell: approximately 64 to 81 calories
- 1 cup (145g) of cooked meat: approximately 129 calories
- A whole 1-pound lobster: yields roughly 5 to 6 ounces of meat after removing the shell, putting the edible portion at around 130 to 160 calories
The slight variation in published calorie counts comes down to the species (American versus spiny lobster), how the meat is cooked, and which database is reporting. The differences are small enough that any of these numbers work as a reliable estimate.
How Butter and Toppings Change the Count
Plain lobster is remarkably lean. What changes the equation is what you dip it in. A single tablespoon of butter sauce adds about 67 calories and 7 grams of fat. Most people use two or three tablespoons over the course of a lobster dinner, which can easily double the total calorie count of the meal.
A lobster roll pushes things further. Between the buttered, toasted split-top bun and either mayonnaise (Maine-style) or drawn butter (Connecticut-style), a typical lobster roll lands somewhere between 400 and 600 calories depending on the size and preparation. The lobster meat itself accounts for only a fraction of that total.
If you’re watching calories, a squeeze of lemon and a pinch of salt keep lobster in the ultra-lean category without sacrificing much flavor.
Lobster vs. Other Shellfish
Lobster holds its own against other popular shellfish when you compare equal 3-ounce servings:
- Lobster: 64 calories, 14 grams protein
- Shrimp: 72 calories, 17 grams protein
- Crab: 74 calories, 15 grams protein
All three are low-calorie, high-protein options. Lobster edges out the others on calories per serving, though shrimp delivers slightly more protein per ounce. The practical difference is negligible. Any of these shellfish works well as a protein source if you’re trying to keep calories low.
Protein and Fat Breakdown
Lobster is almost pure protein. A 145-gram serving delivers 27.6 grams of protein with just 1.3 grams of fat and zero carbohydrates. That protein-to-calorie ratio is comparable to skinless chicken breast, which is often considered the benchmark for lean protein.
The small amount of fat in lobster includes some beneficial omega-3 fatty acids. Spiny lobster provides roughly 300 milligrams of EPA and 100 milligrams of DHA per 100 grams. That’s less than fatty fish like salmon, but it still contributes meaningfully to your intake, especially if you eat shellfish regularly. A 3-ounce serving of spiny lobster contains about 76 milligrams of cholesterol, a moderate amount that fits comfortably within most dietary guidelines.
Vitamins and Minerals Worth Noting
Lobster’s calorie count gets most of the attention, but its micronutrient profile is where it really stands out. A single cup of cooked lobster delivers 190% of the daily value for selenium, a mineral that supports thyroid function and acts as an antioxidant. The same serving provides 53% of the daily value for zinc and 51% for vitamin B12, which is essential for nerve function and red blood cell production.
Few foods pack that much nutritional density into so few calories. You’d need to eat significantly more chicken or beef to match those micronutrient levels, and you’d take in far more calories doing it.
Fresh vs. Frozen Lobster
The calorie and protein content of lobster stays essentially the same whether you buy it fresh or frozen. Where frozen lobster can differ is in sodium. Commercially frozen lobster meat is sometimes treated with a sodium-based preservative solution to maintain texture and extend shelf life. If you’re monitoring sodium intake, check the label on frozen lobster products for added salt or sodium tripolyphosphate. Fresh lobster cooked at home in plain water won’t carry that extra sodium load.