How much protein is in a can of tuna?

Most cans of tuna provide roughly 20 to 35 grams of protein per can, with many common 5-ounce cans landing around 25 to 30 grams after draining. Smaller cans may have closer to 15 to 20 grams. The best way to know for sure is to check the Nutrition Facts panel and look at the serving size and whether the listed amount is for drained tuna.

A useful rule of thumb: tuna packed in water usually gives you a lot of protein with relatively few calories, while oil-packed tuna has similar protein but more calories and fat. If you’re tracking macros, always compare the label instead of guessing.

What changes the protein amount?

Three things matter most: tuna species, can size, and packing liquid. Light tuna, skipjack, and chunk-light products often have similar protein amounts per ounce, but albacore cans are usually larger and can deliver more total protein. A 3-ounce serving is different from a full 5-ounce or 7-ounce can, so the total protein changes even when the protein density is similar.

Drained weight also matters. If a label lists protein per serving of drained tuna, that is the number to use. If it lists nutrition for the entire can, make sure the can is fully eaten and compare the actual ounces. For the most accurate estimate, use the label’s grams of protein per serving and multiply by the number of servings in the can.

Is tuna a healthy protein choice?

Yes, tuna can be a very efficient protein source. Protein supports muscle repair, satiety, and overall daily intake. Tuna also provides nutrients such as selenium and vitamin B12, and some varieties contain omega-3 fats. Harvard Health and Mayo Clinic both note that fish can be part of a heart-healthy eating pattern.

The main tradeoffs are sodium and mercury. Canned tuna can be high in sodium depending on the brand, and mercury levels are higher in some larger tuna species, especially albacore. The NIH advises pregnant people, nursing parents, and young children to choose lower-mercury seafood more often and limit higher-mercury options.

How to use tuna can protein in real meals

Tuna works well when you need a quick protein boost: mix it into a sandwich, salad, pasta bowl, rice bowl, or wrap. If you’re trying to raise protein without adding many calories, pair tuna with vegetables, beans, or whole grains instead of heavy mayo.

If you train at home and track workouts and meals, Fitnit can help with rep counting and form feedback while you keep an eye on your protein intake. It’s not necessary for tuna tracking, but it can make overall fitness habits easier to follow.

Tips

• Check the label for drained serving size before you calculate protein.
• Choose tuna in water if you want more protein for fewer calories.
• Watch sodium if you eat canned tuna often.
• Vary seafood choices to reduce mercury exposure over time.
• Add tuna to meals with fiber-rich foods, like beans or vegetables, for better fullness.