How much protein is in 100g tuna?

A typical 100g serving of tuna contains about 23 to 29g of protein. Fresh tuna steaks are often near the upper end of that range, while canned tuna is usually around the middle depending on whether it’s drained and whether it’s packed in water or oil. In practical terms, 100g tuna can deliver about half or more of the protein many people aim for in a meal.

The exact number varies by species. Yellowfin, skipjack, and albacore can differ slightly, and cooking changes the water content, which can make the protein look higher per 100g after heat is removed. For the most accurate number, use the nutrition label on the exact product you buy or check a reliable food database like USDA FoodData Central.

What changes the protein amount?

The biggest factor is moisture. Fresh tuna loses water when cooked, so 100g cooked tuna usually contains more protein per gram than 100g raw tuna. Canned tuna may also be more protein-dense after draining because some water or oil is removed before you eat it.

Packing medium matters too. Tuna packed in oil often has more calories and fat than tuna packed in water, but the protein difference is usually small. If you’re tracking macros, the serving size on the can matters a lot: many cans list servings by drained weight, not by the full can with liquid included.

Is tuna a good protein choice?

Yes. Tuna is a lean, complete protein, meaning it supplies all essential amino acids. That makes it useful for muscle repair, satiety, and meeting daily protein goals without a large calorie load. It’s especially convenient for quick lunches, post-workout meals, and meal prep.

Tuna also provides other nutrients, including selenium, vitamin D in some varieties, and omega-3 fats. But it shouldn’t be your only fish choice. Because larger tuna species can contain more mercury, it’s smart to rotate tuna with lower-mercury seafood such as salmon, sardines, trout, shrimp, or canned light tuna depending on your needs.

How to use 100g tuna in real meals

A 100g portion of tuna is easy to build around. Try it with rice and vegetables, in a salad with beans and olive oil, mixed into pasta, or on whole-grain toast. If your goal is muscle gain or appetite control, pairing tuna with fiber-rich carbs and healthy fats can make the meal more satisfying and better balanced.

If you track reps or train at home, Fitnit can help you stay consistent with bodyweight and dumbbell work while you build a high-protein routine around meals like tuna. Its camera-based rep counting and form analysis can be useful for at-home strength sessions without extra equipment.

What to know about safety and daily intake

Protein needs depend on body size, activity level, age, and goals. The general RDA for adults is about 0.8 grams of protein per kilogram of body weight per day, but athletes and highly active people often need more. A 100g tuna serving can cover a meaningful chunk of that requirement.

For safety, pay attention to mercury guidance, especially if you’re pregnant, breastfeeding, or feeding young children. Federal and medical guidance generally recommends choosing lower-mercury seafood more often and varying fish choices across the week. If you eat tuna regularly, check species-specific recommendations and serving limits.

Tips

• Use drained weight when tracking canned tuna protein.
• Choose tuna packed in water if you want fewer calories and easier macro tracking.
• Rotate tuna with other seafood to reduce mercury exposure over time.
• Pair tuna with vegetables and a carb source to make the meal more filling.
• Check the can or package label, since protein can vary by brand and tuna type.