Lobster is a lean, protein-rich seafood that fits neatly into low-carb, keto, and high-protein meal plans. But tracking calories for a food that is often sold by the pound or served as a restaurant plate can be tricky. Shell weight, cooking method, and melted butter all change the numbers. This calculator converts your portion into calories per ounce using standard cooked lobster values, so you can log your meal with confidence.
Use it when planning a dinner, logging a restaurant meal, or comparing lobster tail with whole lobster. Enter the amount you are eating, choose ounces or grams, and select whether that weight is edible meat, shell-on tail, or a whole lobster. The calculator estimates the edible meat yield for shell-on portions and can also account for optional melted butter.
Built for seafood lovers, home cooks, and nutrition trackers, this tool returns a realistic calorie total, per-ounce figures, and approximate protein and fat values. That makes your next lobster dinner a little easier to fit into your daily goals.
🦞 Lobster Calories Per Ounce
Quick Start Guide
This calculator is designed for real lobster meals, not just simple nutrition charts. Start by entering the weight of the portion you plan to eat. If you weighed the shell-on tail or a whole live lobster, the calculator estimates the edible meat yield before converting to calories.
- Enter the weight in ounces or grams.
- Select what that weight represents: edible meat, shell-on tail, or whole lobster.
- If you dipped your meat in melted butter, check the option and enter how much you used.
- Press Calculate to see the total calories, calories per ounce, protein, fat, and a full breakdown.
For comparing other lean seafood options, you might also find the catfish calorie calculator and the tilapia calorie calculator useful.
Lobster Nutrition Reference
Cooked lobster meat is naturally low in fat and carbohydrates and high in protein. The values below reflect plain cooked lobster meat with no added butter, sauces, or breading.
| Nutrient | Per 1 oz meat | Per 3 oz meat | Per 100 g meat |
|---|---|---|---|
| Calories | 25 kcal | 76 kcal | 89 kcal |
| Protein | 5.4 g | 16 g | 19 g |
| Fat | 0.2 g | 0.7 g | 0.6 g |
| Carbohydrates | 0 g | 0 g | 0 g |
These figures are based on cooked lobster meat prepared without added fat. You can look up more detail in USDA FoodData Central using entries for crustaceans, lobster, northern, cooked, moist heat.
How the Calculation Works
The calculator starts by converting your logged weight to ounces when needed. If you entered grams, it divides by 28.35 to get ounces. Next, it applies an average edible-yield factor: 100% for meat-only portions, about 45% for shell-on lobster tail, and about 30% for whole lobster. This converts the weight you actually weighed into the weight of meat you are likely eating.
Edible meat ounces are then multiplied by 25.2 calories per ounce. Protein is estimated at 5.4 grams per ounce and fat at about 0.18 grams per ounce. If you chose to add melted butter, the calculator adds roughly 102 calories per tablespoon or 34 calories per teaspoon of butter.
Because lobster contains virtually no carbohydrate, it is a popular choice for low-carb and keto meals. The main calorie additions usually come from butter, mayonnaise, or creamy sauces served alongside the meat.
Worked Examples
Example 1: 4 oz cooked tail meat
Yield is 100%, so edible meat is 4 oz. Calories = 4 × 25.2 = 100.8, or about 101 kcal. Protein is about 21.6 g and fat is about 0.7 g.
Example 2: 1.25 lb whole lobster
1.25 lb is 20 oz. Whole-lobster yield is estimated at 30%, so edible meat is 6 oz. Calories = 6 × 25.2 = 151 kcal. Add one tablespoon of melted butter, and the total rises to about 253 kcal.
Example 3: 150 g shell-on lobster tail
150 g converts to 5.29 oz. With a 45% tail yield, edible meat is about 2.38 oz. Calories = 2.38 × 25.2 = 60 kcal, with about 12.9 g of protein.
Factors Affecting Accuracy
- Yield estimates are averages. Whole-lobster meat yield can range from 20% to 35% depending on season, size, molting stage, and how carefully the meat is extracted.
- Butter, mayonnaise, lemon-butter sauce, or other seasonings can add significant calories. Use the optional butter field or add those calories separately.
- Boiled or steamed lobster can absorb some water, which slightly increases weight without adding many calories.
- Frozen and thawed lobster may retain water and weigh more than the actual meat portion.
- Restaurant calorie counts may vary because of butter basting, marinades, or breading.
Frequently Asked Questions
Does a whole lobster have more calories than the same amount of tail meat?
No. Per ounce of actual meat, whole lobster and tail meat have roughly the same calorie density. The difference is that whole lobster contains shell and body parts, so a larger total weight is needed to get the same amount of meat.
Is lobster keto-friendly?
Yes. Cooked lobster meat contains 0 grams of carbohydrate per serving and is naturally low in fat. The carb count only changes if you eat it with breading, flour-based sauces, or sugary dips.
Why does my result differ from a restaurant nutrition label?
Restaurants often cook lobster with butter, salt, or other seasonings, and their portion weights may include shell. This calculator assumes plain cooked meat unless you add melted butter yourself. That makes it most accurate for home-cooked and plainly prepared lobster.
Can I use this calculator for frozen lobster?
Yes, but you should weigh the cooked meat after thawing and draining, or use the shell-on estimates if you are weighing a raw frozen shell portion. Excess water in frozen packages can make the weight look higher than the true edible meat.