A typical 5-oz can of tuna in water, drained, delivers about 25–30 g of protein; species, brand, and packing liquid can shift the number.
Canned tuna is a handy protein source when you need something fast. Labels look simple, yet numbers vary by species, can size, and whether the count is for “drained” tuna. This guide gives clear ranges you can trust, plus clear math you can apply to any label on the shelf.
Protein In Canned Tuna Per Can: Real-World Ranges
Protein in a can is shaped by four levers: species, packing liquid, drained weight, and serving math. Light tuna (often skipjack) tends to show a touch more protein per weight than albacore. Water-packed cans carry fewer calories than oil-packed cans, but protein per weight stays close. Drained weight matters because water or oil left in the can adds weight without adding protein. Brands also pick different serving sizes, which changes the “per serving” figure you see.
| Type & Pack | Protein Per 100 g* | Protein Per 5-oz Can (Drained)† |
|---|---|---|
| Light tuna, water-packed | 23–26 g | 25–30 g |
| Albacore (white), water-packed | 22–25 g | 23–27 g |
| Light tuna, oil-packed | 23–26 g | 25–30 g |
*Drawn from USDA-based data sets for canned tuna in water. †Range reflects typical drained weight for a 5-oz net can and brand label examples. See sources cited below.
How Labels Turn One Can Into A Protein Number
Most labels use a 3-oz drained serving. If the panel lists 19 g of protein per 3 oz drained, the full can will land near 25–30 g once you drain it. Some brands list a single “per can” number. You’ll see 20–26 g per can on common products, depending on species and can size.
Where Those Serving Numbers Come From
USDA FoodData figures for canned tuna in water sit around the mid-20s per 100 g. A drained 5-oz can usually yields 110–120 g of fish. Multiply the per-100 g figure by that drained weight and you land in the same 25–30 g range. The Canned White Tuna (water packed) entry based on USDA data is a handy benchmark for the math.
If your pantry has flavored pouches, expect similar protein with swings from added sauces. Those packets often weigh a bit less than small cans, so the per-pouch total lands near a single 3-oz serving. Check the panel for “drained” wording before comparing.
Species, Pack, And Why Numbers Vary
Species Choice
Skipjack (often sold as “light”) packs lean protein with a mild taste. Albacore (sold as “white”) has a firmer bite and a slightly different macro profile per label. Both deliver solid protein. Species also ties to mercury guidance, covered below.
Water Vs. Oil
Oil raises calories. Protein per drained weight stays close to water-packed because protein sits in the fish, not the liquid. Choose water when you want more protein per calorie. Choose oil when you want richer texture or extra calories.
Drained Weight
Brands do not drain identically during lab tests. That’s why two similar cans can list different “per serving” numbers. The quickest way to compare? Look for “protein per can” or multiply the “per serving” figure by the listed servings per container, then adjust if the panel says “about” a serving and a half.
Simple Math You Can Use In The Aisle
- Spot the serving size. Most list “3 oz drained.”
- Grab the protein per serving. Many show 18–20 g.
- Multiply by servings per can. A 5-oz can often lists 1 to 1.5 servings. That lands you in the mid-20s for the whole can.
- If sodium looks high, look for “low sodium” or “no salt added.”
Is Tuna A Safe Weekly Protein Pick?
Health agencies encourage seafood intake and sort fish into intake tiers based on mercury levels. Canned light sits in the “Best Choices” tier with guidance to eat it two to three times per week. Albacore sits in a middle tier, so keep it to once a week for most people. You can read the FDA’s detailed advice about eating fish for species lists and serving sizes.
Label Examples From Real Cans
Brand panels help anchor the ranges. One common solid white albacore can lists 26 g of protein per can. A typical chunk light in water lists about 20 g per can. Another label uses the 3-oz drained serving and prints 19 g per serving with roughly one and a half servings per can, which lands near 28–29 g for the whole can. These values sit inside the table ranges above.
If you buy a larger can, the math scales. A 12-oz family can often lists three 3-oz drained servings at about 19 g each. That puts the whole can near 57 g of protein before you add any mix-ins.
Common Can Sizes And Approximate Protein
Use this table to translate can size into a ballpark protein total. Ranges account for species and label math differences.
| Can Size (Net) | Typical Drained Weight | Protein Range Per Can |
|---|---|---|
| 5 oz (142 g) | 110–120 g | 25–30 g |
| 7 oz (198 g) | 150–165 g | 35–42 g |
| 12 oz (340 g) | 260–290 g | 60–75 g |
| Pouch 2.6–3 oz | 75–85 g | 17–22 g |
Calories, Fat, And Sodium: Quick Comparisons
Water-packed cans keep calories low since most energy comes from protein. Oil-packed cans add fat calories. Many 5-oz water-packed cans list around 100–130 calories for the fish alone, while similar oil-packed cans can land above 200. Sodium varies widely. Low sodium or no salt added cans keep the total in check if you’re watching intake.
When you mix tuna with mayo or oil, the protein stays the same but calories climb. If you want a lighter bowl, use Greek yogurt, mustard, lemon, herbs, or salsa for punch without a large calorie bump.
Quick Meal Ideas That Hit Protein Goals
15-Minute Options
- Tuna + plain Greek yogurt + lemon + dill on whole-grain toast.
- Tuna + white beans + cherry tomatoes + olive oil + parsley.
- Tuna + rice + cucumber + nori strips + soy sauce for a pantry bowl.
- Tuna + avocado + lime + chopped jalapeño in a warm tortilla.
Make-Ahead Mixes
- Tuna with celery, red onion, and light mayo. Keep chilled for quick sandwiches.
- Tuna, couscous, chopped spinach, and a squeeze of citrus. Packs well for lunches.
- Tuna, farro, roasted peppers, and capers with a splash of vinaigrette.
How This Guide Grounds Its Numbers
USDA-based datasets place canned tuna in water around the mid-20s grams of protein per 100 g. Brand nutrition panels show real-world “per can” values from 20 g up to the mid-20s, and serving-based math lands in the same range. Mercury guidance comes from U.S. agencies that grade species into tiers for routine intake. Nerd out if you like math: take the per-100 g number from a reliable entry, multiply by the drained weight you see on the label, and you have a sound estimate for your exact can.
What To Buy When Protein Is The Goal
- Pick water-packed cans when you want more protein per calorie.
- Choose light tuna for routine meals; rotate albacore less often.
- Scan for “low sodium” if that matters to you.
- When labels list protein per serving, multiply by servings per can to get a fast total.
- If you need more calories, pick oil-packed or add olive oil, beans, or avocado.
Bottom Line On Tuna Can Protein
One small can delivers a strong protein punch that fits into busy days. Expect 25–30 g of protein from a drained 5-oz can in water. Bigger cans scale the total up in a straight line. Pick the species and pack that match your goals, and keep variety across the week with other low-mercury fish.
Sources: USDA FoodData Central entries for canned tuna in water; brand nutrition panels; U.S. FDA guidance on fish intake and mercury categories.