Chicken vs. tuna: the protein comparison

On a typical cooked, skinless chicken breast serving, you’ll usually get about 25 to 26 grams of protein in 3 ounces. Tuna is also very high in protein, but the amount varies by species and form. A 3-ounce serving of canned tuna or cooked tuna steak commonly lands in the low-to-mid 20s for grams of protein, and some tuna products can get close to chicken breast.

So, if you’re comparing standard servings, chicken breast usually has a little more protein than tuna. But the difference is small enough that both foods belong in the same “high-protein” category.

Why the numbers change

The exact answer depends on the type of chicken and tuna you’re eating. Chicken breast has more protein than chicken thighs or wings, and tuna steaks can differ from canned light tuna, albacore, or oil-packed tuna. Water content also matters: foods with more water can look like they have less protein per ounce even when they’re still very protein-dense.

Cooking method matters too. Grilling, baking, broiling, and draining canned tuna can change the final weight and therefore the protein amount per serving. That’s why comparing equal weights is more useful than comparing “one chicken breast” to “one can of tuna,” which can be very different sizes.

Which is better for your goals?

For muscle building, fat loss, or general satiety, both chicken and tuna are strong choices because they provide a lot of protein without much carbohydrate. Chicken breast is often the simpler pick if you want a very lean, versatile protein. Tuna is convenient, shelf-stable, and easy to use in quick meals.

One important difference is variety and safety. Tuna can be a great protein source, but some types contain more mercury than others, so it’s smart not to rely on large amounts every day. The FDA and EPA recommend paying attention to fish choices, especially for pregnant people and young children.

How to choose between them

If your main question is strictly protein, chicken breast often wins by a small margin. If your priority is convenience, tuna may be easier. If you want to manage calories and fat, both can work well as long as you choose lean chicken and tuna packed in water rather than oil.

For people tracking intake closely, reading labels or logging portions can help remove guesswork. Tools that estimate portions and macros from food photos can make that easier, especially when meals are mixed or you’re eating at home without a scale.

Tips

• Compare protein by equal cooked weight, not by the size of the whole piece or can.
• Choose skinless chicken breast for the leanest chicken option.
• Pick tuna packed in water if you want fewer extra calories from fat.
• Rotate protein sources through the week instead of relying on one food only.
• If you eat tuna often, pay attention to mercury guidance from FDA and EPA.