If you’re comparing tuna and chicken for protein, the short answer is: it depends on the cut and the serving size. Chicken breast is often equal to or slightly higher in protein per 100 grams than canned tuna, while tuna steaks can be very close.
Both are excellent high-protein foods. The better choice usually comes down to your goals, your budget, and how you plan to eat it.
Protein comparison: tuna vs. chicken
For a fair comparison, look at the same cooking method and similar portions. Cooked skinless chicken breast is usually around 31 grams of protein per 100 grams. Canned light tuna, drained, is often around 26 grams per 100 grams. That means chicken breast commonly has more protein by weight.
But the gap is not huge. A tuna steak can land closer to chicken, and a larger serving of tuna may give you more total protein than a smaller chicken portion. The main point is that both foods are protein-dense, so the “winner” depends on the specific product and serving size.
Why the numbers change so much
Tuna is not one single food. Canned light tuna, albacore tuna, and fresh tuna steaks all have different water content and nutrient profiles. Chicken also varies by cut: breast is much leaner and higher in protein per calorie than thigh or drumstick.
Cooking also changes the math. Water is lost during cooking, so protein appears more concentrated by weight. That is why raw and cooked values can look different even when the actual amount of protein in the food has not changed much.
Which is better for muscle, weight loss, or convenience?
If your main goal is maximizing protein with fewer calories, skinless chicken breast is a strong choice. It is also easy to portion, meal prep, and pair with vegetables or grains. Tuna is equally useful when you want a fast, no-cook protein source, especially canned tuna.
For muscle-building, total daily protein matters more than choosing one food over the other. Both tuna and chicken can help you hit your target. If you train at home, tools like Fitnit can help with automatic rep counting and AI form feedback, which can make it easier to track workouts and keep technique clean while you focus on nutrition.
Important nutrition trade-offs: mercury, sodium, and variety
Tuna has one important caution: mercury. Mercury levels are usually higher in larger tuna species, so frequent intake should be moderate, especially for pregnant people and young children. Canned light tuna generally has less mercury than albacore.
Canned tuna can also be high in sodium, depending on the brand and whether it is packed in water or oil. Chicken can be high in sodium too if it is brined, seasoned heavily, or processed. Choosing lower-sodium versions and rotating protein sources is usually the best approach.
Tips
- Compare servings by weight, not by can size or plate size, to get a fair protein comparison.
- Choose skinless chicken breast when you want the most protein per calorie.
- Choose tuna when you want a quick, no-cook protein option.
- Watch sodium on canned tuna and look for lower-sodium versions when possible.
- Rotate protein sources through the week to help with nutrient variety and mercury exposure.
Sources
- FoodData Central — USDA
- Protein in the diet — NIH
- Protein: How much do you need every day? — Harvard Health Publishing
- Protein — ACE Fitness
Frequently Asked Questions
Does tuna have more protein than chicken breast?
Usually no. Cooked chicken breast typically has slightly more protein per 100 grams than canned light tuna, though tuna steaks can be close.
Is tuna or chicken better for building muscle?
Both work well. Pick the one that helps you consistently hit your daily protein goal and total calories.
Which has fewer calories, tuna or chicken?
Skinless chicken breast and tuna are both lean, but chicken breast is often a little lower in calories per gram of protein.
Is canned tuna as healthy as chicken?
Yes, it can be a nutritious lean protein source, but tuna has more mercury concerns and canned versions may be higher in sodium.
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