Protein in tuna depends on the type and portion you eat. As a reference, 3 ounces of drained canned light tuna in water provides about 17 grams of protein, while 3 ounces of cooked yellowfin tuna provides about 25 grams. These estimates use specific USDA food entries; the label on your canned tuna may differ. [1]
When you’re fitting meals around work and the gym, the useful question is simple: how much protein is in the tuna on your plate?
You don’t need to compare every product on the shelf. Start with the serving size, then choose the entry that matches your tuna: canned in water, canned in oil, or fresh.
Protein in tuna by serving size
The table below compares edible fish weight. For canned tuna, weigh the drained fish. For fresh tuna, choose the raw or cooked row to match when you weighed it.
| Tuna type | 3 oz (85 g) | 100 g | 4 oz (113 g) |
|---|---|---|---|
| Canned light, in water, drained | 16.5 g | 19.4 g | 22.0 g |
| Canned light, in oil, drained | 24.8 g | 29.1 g | 32.9 g |
| Fresh yellowfin, weighed raw | 20.7 g | 24.4 g | 27.6 g |
| Fresh yellowfin, cooked with dry heat | 24.8 g | 29.2 g | 32.9 g |
Calculated from USDA Standard Reference entries 15121, 15119, 15127, and 15221, using the gram weights shown and rounding to one decimal place. These are reference foods, not universal product values. [1]
Quick tracking tip: a serving is a reference amount, not a requirement to eat exactly that much. Log the amount you actually eat.
How much protein is in a can of tuna?
There is no single protein number for every can. Can sizes, drained amounts, and products differ. Check whether the Nutrition Facts panel gives protein for one serving or the entire container.
For example, if your label says 20 grams per container, eating the whole container gives you about 20 grams. Half gives you about 10 grams. That’s an illustrative label example, not a claim about every can.
When weighing canned tuna, check the serving basis. If the information is for drained fish, use the weight after draining. Don’t count the packing liquid as though it were tuna flesh.
For a busy workday, a tuna sandwich or rice bowl is a straightforward meal idea. Count the bread, rice, dressing, and other ingredients separately if you’re tracking the whole meal.
For another canned-fish option, see our guide to protein in sardines.
How much protein is in fresh tuna?
Fresh tuna needs a little more detail in your food log: the species and whether you weighed it raw or cooked.
The yellowfin examples in the table show why this matters. Cooking changes the weight and moisture content, so the raw and cooked numbers are not interchangeable. It doesn’t create extra protein.
If you weigh a tuna steak before cooking, use a matching raw entry. If you weigh it afterward, use a matching cooked entry. Add cooking oil or sauce separately.
Fresh tuna may suit a planned dinner, while canned tuna can be more convenient when you want less preparation. Choose what fits your routine and preferences. You can also compare portions using our guide to protein in salmon fillets.
What about tuna canned in oil?
Oil-packed tuna is still canned tuna; it needs a separate nutrition entry because its composition differs from water-packed tuna.
Oil itself supplies no protein. The higher protein concentration in the selected USDA oil-packed entry does not mean adding oil creates protein. These are different reference foods, not the same tuna tested before and after adding oil. [1]
For packaged tuna, follow your own label and its instructions about draining. If you eat packing oil that a drained-food entry excludes, account for that oil separately.
Taste may help you choose. Bon Appétit’s editors describe water-packed tuna as more neutral and olive-oil-packed tuna as richer. That is an attributed editorial observation, not our own taste test, and individual products vary. [2]
You don’t have to enjoy tuna plain. Lemon, mustard, herbs, or a dressing can be options to try. Choose a meal you want to eat rather than forcing down a food solely for its protein number.
A brief note on mercury: tuna species matter beyond protein. FDA/EPA guidance places canned light tuna in “Best Choices,” albacore and yellowfin in “Good Choices,” and bigeye in “Choices to Avoid.” The guidance specifically addresses people who might become or are pregnant or breastfeeding, and children; portions and frequency depend on the group. Check the guidance and vary your fish choices. [3]
How does your tuna serving fit into your day?
Use our free protein calculator to estimate your daily target, then plan a mix of meals around it. A tuna portion is one contribution to that target, not your whole food plan.
Sources and calculation notes
- USDA National Nutrient Database for Standard Reference, Release 27: Finfish and Shellfish Products. Entries 15121 (light tuna, canned in water, drained), 15119 (light tuna, canned in oil, drained), 15127 (yellowfin, raw), and 15221 (yellowfin, cooked with dry heat). Protein per 100 g: 19.44 g, 29.13 g, 24.40 g, and 29.15 g respectively. Portion calculation: gram weight Ă— protein per 100 g Ă· 100. This is historical reference data; use a current product label when available.
- Bon Appétit: Which Canned Tuna Is the Best? Source of the attributed taste comparison.
- FDA/EPA: Questions and Answers About Eating Fish.
