Protein by the numbers

For a fair comparison, compare cooked, edible portions by weight. Cooked skinless chicken breast typically provides about 30–32 grams of protein per 100 grams. Canned tuna packed in water is usually around 25–29 grams per 100 grams, depending on the species and how much liquid is drained.

That means chicken breast is often slightly higher in protein gram-for-gram, but the gap is not huge. In real-life servings, a 3-ounce portion of either food can easily land in the 20- to 30-gram protein range.

If you compare a chicken thigh, breaded chicken, tuna salad with mayonnaise, or an oil-packed tuna, the numbers can change a lot. Preparation matters as much as the food itself.

Why the answer is not always simple

Chicken is a broad category. Breast meat is the leanest and highest-protein cut, while dark meat has slightly less protein per calorie and more fat. Tuna is also a broad category: fresh tuna steaks, canned albacore, canned light tuna, and tuna mixed into a recipe all differ in protein density.

Another reason the comparison gets tricky is portion size. A typical chicken breast on your plate is often larger than a standard can of tuna, so the total protein in the meal may be higher even if the protein concentration is similar.

If your goal is maximum protein with minimal calories, both can work well. Chicken breast is often a little leaner per serving, while tuna is very protein-dense and convenient.

Other nutrition differences that matter

Protein is only one part of the decision. Tuna generally has more omega-3 fats than chicken, which can be a plus for heart-healthy eating. On the other hand, tuna can contain mercury, and some types should be eaten in moderation—especially for pregnant people and young children.

Chicken is usually lower in mercury and easier to eat more frequently. It can also be a good option if you want a lower-sodium meal, because canned tuna may have added sodium unless you choose a low-sodium version.

If you’re tracking macros, the best choice depends on your overall diet. For example, tuna may fit better when you want a compact, shelf-stable protein source, while chicken may be better if you want a larger, more filling meal.

The bottom line

So, is there more protein in chicken or tuna? Usually chicken breast has a slight edge over canned tuna by weight, but both are very high in protein and close enough that serving size and preparation matter more than the label alone.

If you want the most protein per bite, choose skinless chicken breast or tuna packed in water and drained well. If you want more omega-3s, tuna has the advantage. If you want a lower-mercury protein you can eat often, chicken is the safer everyday staple.

Tools that help you keep workouts and meals consistent can make a difference too. For example, Fitnit can count reps from your phone camera and analyze form, which can help support steady training while you keep an eye on protein intake.

Tips

• Compare foods by cooked weight, not just by the label or can size.
• Choose skinless chicken breast or tuna packed in water if you want the highest protein with fewer extra calories.
• Watch sodium in canned tuna, especially if you eat it often.
• Rotate protein sources so you get a broader nutrient mix and reduce overreliance on one food.
• If you’re pregnant or feeding a child, check mercury guidance before making tuna a daily protein source.