Octopus is a lean, protein-rich seafood that fits easily into a wide range of eating styles, from Mediterranean plates to high-protein training meals. Despite its impressive 15 g of protein per 100 g in raw form, it stays low in fat and carbohydrates, making it a useful choice for calorie-conscious cooks who want something more interesting than chicken breast.
This calculator converts your serving into calories and macros using standard USDA values for both raw and cooked octopus. You can switch between grams, ounces, pounds, or kilograms, choose how your octopus was prepared, and even add the cooking fat you used so your final estimate reflects what actually goes on the plate.
Whether you’re planning a seafood dinner, checking a restaurant portion, or logging a meal, this tool gives you a clear breakdown in seconds.
📊 Nutrition Breakdown
How to Use This Tool
Start by entering the amount of octopus you plan to eat. Pick the unit you have on hand — grams, ounces, pounds, or kilograms — then choose whether your octopus is raw or cooked. If you sautéed it or finished it with oil or butter, select the matching cooking-fat option so those calories are included too.
- Enter your serving amount and choose the matching unit.
- Select raw or cooked. Raw is best when you weigh the portion before cooking; cooked is better for leftovers or premade seafood.
- Optional: select a cooking fat to see the combined total.
- Press Calculate to view calories, protein, fat, carbs, and a step-by-step breakdown.
Tip: The quick-fill chips (100 g, 85 g / 3 oz, 1 lb, 150 g) set common portions instantly. You can still edit the amount afterward and recalculate.
Nutrition Reference (per 100 g)
The values below are based on USDA FoodData Central entries for common octopus and are the backbone of this calculator.
| Form | Calories | Protein | Fat | Carbohydrates |
|---|---|---|---|---|
| Raw | 82 kcal | 14.9 g | 1.0 g | 2.2 g |
| Cooked (boiled/steamed) | 164 kcal | 29.8 g | 2.1 g | 4.4 g |
Because octopus loses water when cooked, the same 100 g of cooked meat contains more concentrated calories and protein than 100 g of raw meat. That is why it is important to select the correct form for the scale you are using.
How the Estimate Is Calculated
The calculator first converts your serving size into grams, then multiplies the per-100-g nutrition values by the gram weight divided by 100. For example, a 250 g raw portion is 2.5 × the 100 g baseline, while an 85 g cooked portion is 0.85 × the cooked baseline.
Worked example: You cook 150 g of raw octopus in 1 tablespoon of olive oil. Raw octopus provides 82 kcal per 100 g, so 150 g gives 1.5 × 82 = 123 kcal from the octopus, plus about 22.4 g protein, 1.6 g fat, and 3.3 g carbs. Add 1 tablespoon of olive oil (119 kcal, 13.5 g fat), and the meal component totals roughly 242 kcal, 22.4 g protein, 15.1 g fat, and 3.3 g carbs.
If you use the cooked option, the base values are 164 kcal, 29.8 g protein, 2.1 g fat, and 4.4 g carbs per 100 g, and the same multiplication applies. Macro percentages are not shown because they can vary depending on added fat; using the optional oil field keeps the final fat estimate realistic.
Tips & Best Practices
- Weigh before cooking for raw entries, after cooking for cooked entries. Octopus shrinks by roughly 30–40% when cooked, so 100 g raw will not weigh 100 g after boiling. Using the matching form prevents over- or under-counting.
- Count the oil honestly. A light brush coats differently than a shallow fry. If much of the oil stays in the pan or is drained off, reduce or skip the added fat to avoid overestimating calories.
- Watch sodium too. Tenderized, canned, or smoked octopus can have very high sodium levels even though its calorie and macro profile stays similar. Check the label if sodium is a concern.
- Pair it with non-starchy vegetables for a low-calorie, high-protein seafood dinner, or with potatoes and bread on higher-carb days.
- For low-carb or keto planning, this tool’s carb estimate can be combined with the octopus net carbs calculator to separate fiber from digestible carbs.
Frequently Asked Questions
Why does cooked octopus have more calories per 100 g than raw octopus?
Because cooking removes moisture. When water leaves the meat, the same weight of cooked tissue contains a larger proportion of protein and fat, so calories per 100 g are higher. The nutrients in the whole original portion do not suddenly multiply; the change is simply a matter of weight concentration. This is why the calculator asks you to match the entry to the form you are weighing.
Is octopus a good source of protein for muscle building?
Yes. Raw octopus is about 15% protein by weight, and cooked octopus is about 30% protein. It is also low in saturated fat and provides micronutrients such as vitamin B12, selenium, and iron. For someone tracking body composition, it can be a high-satiety alternative to fattier cuts of meat.
Does grilling change the macros compared with boiling?
If you weigh the cooked result, grilling and boiling give very similar calorie and macro values per 100 g because both remove water. The main difference is whether you add oil or a marinade. Grilled octopus often absorbs or retains more oil, so be generous when logging added fat if it looks glossy.
Is it safe to eat octopus regularly?
Octopus is generally safe for most people when cooked thoroughly. People with conditions such as gout should check with their care team, and health agencies advise limiting certain large seafood due to mercury; octopus is considered lower-risk than many large predatory fish, but variety is still a good idea. If you have specific health concerns, talk with your doctor or a registered dietitian.
Real-World Applications
This estimator is useful for Mediterranean-diet meal plans, high-protein fat-loss days, restaurant portion estimates, and scaled family recipes. If you are cooking for several people, enter the total weight of the whole octopus and divide the result by the number of servings, or use the pounds-to-grams conversion tool to translate a recipe measurement first. Food labels and restaurant nutrition information can vary by species, marinade, and preparation method, so treat the numbers as a solid estimate rather than a laboratory result.