A 6-oyster steamed serving lands around 70 calories, or roughly 12 calories each, so steamed oysters are light while still packing protein, zinc, and B12.
Calories (6 Oysters)
Protein (6 Oysters)
Zinc (6 Oysters)
Plain Steamed
- Shells popped, no butter
- ≈12 kcal each
- Bright briny flavor
Lowest calories
Steamed With Butter
- 1 tsp melted butter
- Adds ~35 kcal fat
- Still no breading
Rich taste
Fried Po’boy
- Breaded oysters
- Soft roll + mayo sauce
- Heavier meal style
Calorie heavy
Calories In Steamed Oysters Per Serving Breakdown
Steaming keeps oyster meat tender without breading or frying, so the calorie count stays low. A typical 100 gram cooked portion, roughly 3 ounces, comes in near 84 calories with about 8 to 9 grams of protein and only around 3 grams of fat. That same 3 ounce cup is close to 5 to 6 medium oysters, which means you’re looking at about 12 calories per medium steamed oyster.
The table below shows ballpark calorie numbers for common steamed oyster portions you’ll see at a raw bar or seafood shack. These numbers pull from USDA-style listings for “oyster, eastern, cooked, moist heat,” which is the database way of saying the oyster was cooked with steam or gentle heat, not fried in oil.
| Serving Size | Calories (Steamed) | What That Means |
|---|---|---|
| 1 Medium Oyster (≈14 g meat) | ~12 kcal | Single slurp size, no butter |
| 6 Medium Oysters (≈85 g meat) | ~70 kcal | Restaurant half-dozen plate |
| 3 oz Cooked Oyster Meat (85 g) | ~84 kcal | Standard “nutrition facts” serving |
| 100 g Cooked Oyster Meat | ~84 kcal | Food scale reference |
| 12 Medium Oysters (≈170 g meat) | ~140 kcal | Full tray / main course size |
That means a half-dozen tray of steamed oysters, dipping in plain lemon, barely dents your daily calorie needs for many adults, even if you’re tracking intake for weight loss or maintenance.
Steamed oysters pull off this low calorie trick while still bringing protein, vitamin B12, iron, and omega-3 fats like EPA and DHA. USDA FoodData Central describes oysters as nutrient-dense seafood with lean protein and minerals. The FDA seafood advice page lists oysters in the “best choices” group for low-mercury shellfish that fit in a normal week for most adults, pregnant people, and kids, as long as they’re cooked all the way through.
Why Steamed Oysters Are So Low In Calories
Oyster meat is mostly water and lean tissue. You’re getting seafood that tastes rich, but gram for gram the energy load sits in the same ballpark as lean white fish, not bacon or butter. There are three main reasons that steamed oyster calories stay this friendly.
Lean Protein And Water Content
A 3 ounce steamed portion runs roughly 8 to 9 grams of protein. That’s solid protein density for fewer than 100 calories. Protein helps you feel satisfied after a meal and can slow the urge to keep snacking right away. You’re filling up on chew and brine, not filler starch.
No Bread, No Oil
Steaming oysters means the cook traps heat and moisture until the shells pop. No batter. No deep fryer. No mayo-heavy sauce baked on top. That’s a huge swing compared with fried oysters or a po’boy sandwich, where breading, oil, and bread can triple or quadruple the calorie count fast.
Trace Carbs And Natural Fat
Per 100 grams of steamed oyster meat you’re looking at roughly 4 to 5 grams of carbohydrate and around 3 grams of total fat. Both numbers sit low. Carbs mainly come from glycogen stored in the oyster, not from sugar added in the kitchen. The fat that’s there includes omega-3s, the same marine fats that show up in fish oil, which are linked to heart and brain benefits in FDA seafood guidance.
Calories In Steamed Oysters Vs Other Cooking Styles
Calories change fast once you start adding breading, butter, cream sauce, or a bun. That’s why a plain steamed platter lands in “lean seafood” territory, while fried oysters in a po’boy feel more like bar food. The table below gives rough calorie comparisons across common oyster styles. Values are per ~3 ounce cooked portion unless noted. Data lines up with USDA-style cooked oyster listings and common prep add-ons.
| Preparation Style | Calories | Why It Changes |
|---|---|---|
| Plain Steamed (no butter) | ~84 kcal | Moist heat only, no breading |
| Steamed + 1 tsp Butter | ~120 kcal | Butter adds ~35 kcal fat |
| Fried Oysters | ~200+ kcal | Breading & oil cling to the meat |
| Oyster Po’boy Sandwich (4–6 fried oysters on a roll) | ~450–600 kcal | White roll, mayo sauce, frying oil |
See how steaming keeps things tight? You’re getting seafood flavor with a calorie load closer to shrimp cocktail than to a fried seafood basket. That makes steamed oysters handy for people watching sodium and calories at the same time, since you can season with lemon, cracked pepper, or hot sauce instead of salty butter sauce.
Are Steamed Oysters Healthy For You
Steamed oysters punch above their calorie number in micronutrients. A modest serving hands you hefty amounts of vitamin B12, iron, copper, and selenium. Oysters also deliver huge zinc levels. The NIH Office of Dietary Supplements notes that oysters hold more zinc per serving than any other common food, beating beef and chicken by a wide margin. Six medium oysters can land above 300% of the daily zinc target while staying under 80 calories, which helps explain why seafood pros call oysters a powerhouse food for micronutrients even though the calorie hit stays tiny.
Omega-3 fats in oysters, mainly EPA and DHA, show up in FDA seafood guidance because they’re linked to heart and brain health, and they’re helpful during pregnancy and breastfeeding. The FDA lists cooked low-mercury shellfish like oysters and mussels as smart seafood picks for pregnant people and young kids, as long as the shellfish is fully cooked. Low mercury matters because large predator fish such as swordfish and some tuna steaks can carry higher mercury. Too much mercury can harm brain growth in babies and young kids, so swapping in steamed oysters keeps flavor while easing that risk.
Protein For Staying Satisfied
Low calorie foods sometimes leave you hungry fast. Steamed oysters don’t do that. A half-dozen has around 8 grams of protein, which helps you feel done eating sooner and can help you go longer between snacks. Pair that tray with a simple side like grilled vegetables, corn, or a vinegar slaw and you’ve got a filling meal still under a couple hundred calories.
Iron, B12, And Energy Levels
Iron in oysters helps carry oxygen in the blood, and vitamin B12 feeds normal nerve function and red blood cell production. People who feel run down sometimes learn that low iron or low B12 is part of the story. Shellfish like oysters can raise intake without piling on calories from heavy red meat.
Who Should Be Careful With Steamed Oysters
Most people can enjoy steamed oysters a few times a month with no trouble, but a few groups should pause and plan. People with shellfish allergy should skip oysters altogether. Folks watching sodium for blood pressure might cap portions, since oyster meat naturally carries sea salt and sauces can stack more sodium fast. People dealing with high cholesterol sometimes worry about shellfish. Oysters do contain cholesterol, yet the calorie level and fat load stay low, which makes steamed oysters easier to fit into a balanced plate than a heavy fried seafood platter.
Safety Tips For Eating Steamed Oysters
Cooking matters. Raw oysters can carry bacteria like Vibrio, which can make people sick. The FDA seafood advice page says to stick to cooked oysters during pregnancy, while breastfeeding, or if you have a weaker immune system. Steaming until the shells pop and the meat turns opaque is a fast way to get that kill step.
Watch The Sauce And Sides
The oyster by itself stays light. The butter tub, cheesy topping, or fried side can double or triple the calorie count you planned. If you want the briny flavor without the calorie bomb, squeeze lemon, add hot sauce, or spoon a mignonette built with vinegar, minced shallot, and cracked pepper. No mayo needed.
Sodium And Portion Size
Oysters pull sodium from seawater, so sodium can creep up fast once you hit full entrée portions. If you’re tracking blood pressure, stick to a half-dozen steamed oysters and fill the plate with low-sodium sides. That plate still sits under 100 calories for the oysters themselves, which keeps room in your meal plan for a baked potato or a slice of bread later in the day.
Bottom Line On Steamed Oyster Calories
A half-dozen steamed oysters lands near 70 calories, roughly 8 grams of protein, and a surge of zinc, B12, and omega-3 fats for a tiny calorie bill. You get briny flavor, chew, and real micronutrients while keeping oil and starch to a minimum. For a longer read on heart-friendly seafood fats, try our guide to omega-3 fats for heart.