Seafood
Tuna (canned in water) nutrition facts
A 1 undetermined oz (28 g) serving of tuna (canned in water) provides 56 calories, 8 g protein, 0 g carbohydrate, and 2 g fat — about 61% of its calories from protein, 0% from carbohydrate, and 39% from fat. The interactive label below toggles between a serving and 100 g.
Calorie split
Vitamins & minerals
Per serving (28 g)
- Vitamin A (RAE)
- 6.52 mcg
- Vitamin E
- 0.25 mg
- Vitamin K
- 12.5 mcg
- Thiamin (B1)
- 0.01 mg
- Riboflavin (B2)
- 0.03 mg
- Niacin (B3)
- 3.52 mg
- Vitamin B6
- 0.03 mg
- Folate (DFE)
- 1.42 mcg
- Vitamin B12
- 0.62 mcg
- Magnesium
- 8.79 mg
- Phosphorus
- 88.2 mg
- Zinc
- 0.26 mg
- Copper
- 0.02 mg
- Manganese
- 0.00 mg
- Selenium
- 21.5 mcg
Nutrition highlights
Per 1 undetermined oz (28 g), tuna (canned in water) is an excellent source of Selenium, Vitamin B12, and Niacin and a good source of Protein and Vitamin K.
% of the FDA Daily Value per 1 undetermined oz (28 g) serving.
Key metrics
Nutrient density
Per 100 kcal, tuna (canned in water) delivers about 11% of a Daily Value on average across 22 beneficial nutrients. The score is its percentile for that measure among the 177 foods in our database — higher means more nutrition per calorie. How this is calculated.
- More protein than 98% of foods · 93% of seafood
Density counts protein, fiber, and vitamins and minerals (not fat, sodium, or sugar), each capped so a single nutrient can’t dominate, with a calorie floor so very-low-calorie foods aren’t overstated. It measures nutrition per calorie within our database — a useful guide, not a complete verdict on how “healthy” a food is.
Similar foods & swaps
The closest seafood to tuna (canned in water) by nutrition (per 100 g), and how each differs.
Protein quality
As an animal-source protein, tuna (canned in water) is a complete protein — it supplies all nine essential amino acids on its own, so it doesn’t need to be paired with another protein source.
Questions
- How many calories are in tuna (canned in water)?
- A 1 undetermined oz (28 g) serving of tuna (canned in water) has about 56 calories. Per 100 g, it has 198 calories — a moderate calorie density.
- How much protein is in tuna (canned in water)?
- Tuna (canned in water) provides about 8 g of protein per 1 undetermined oz (28 g) serving, which is 17% of the Daily Value — a good source.
- What are the macros in tuna (canned in water)?
- Per serving, tuna (canned in water) has roughly 8 g protein, 0 g carbohydrate, and 2 g fat. By calories, that is 61% protein, 0% carbohydrate, and 39% fat.
- Is tuna (canned in water) high in protein?
- Tuna (canned in water) has a protein density of about 14.7 g per 100 kcal, and 61% of its calories come from protein. Foods above roughly 10 g per 100 kcal are generally considered protein-dense.
- What vitamins and minerals are in tuna (canned in water)?
- Per 1 undetermined oz (28 g), tuna (canned in water) is a notable source of Selenium, Vitamin B12, Niacin, and Vitamin K. The label above lists the full micronutrient profile with % Daily Values.
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References & methodology
- Data source: U.S. Department of Agriculture, Agricultural Research Service — FoodData Central, FDC ID 173708 (public domain).
- Daily Values: FDA Nutrition Facts label, 2016 update (adults and children aged 4+).
- Source claims: a serving supplying 10–19% of the Daily Value is a “good source”; 20% or more is an “excellent source” (FDA, 21 CFR 101.54).
- Calorie split: Atwater general factors — 4 kcal/g for protein and carbohydrate, 9 kcal/g for fat.
- Last reviewed: June 2026. Values are typical figures and vary with variety, ripeness, and preparation.
NutriFactsHub. “Tuna (canned in water) Nutrition Facts.” https://www.nutrifactshub.com/foods/tuna-canned-in-water