How Much Mercury Is In A Can Of Albacore Tuna? | Clear-Safe Guide

Shoppers often switch between “white” (albacore) and “light” tuna, but the cans look the same. The difference that matters is mercury. Albacore is a larger, longer-lived species, so it accumulates more. Below, you’ll see clear numbers grounded in federal sources, how to convert ppm to micrograms per portion, how this lines up with safety guidance, and simple ways to keep tuna in your routine without overdoing it.

Quick Context On Units And A Typical Portion

Mercury levels on official lists use parts per million (ppm), which is the same as micrograms per gram (µg/g). A practical eating portion for adults is 4 ounces, or 113 grams; that’s the portion size used by U.S. guidance for fish.

Mercury By Tuna Type (FDA Numbers)

The FDA compiled thousands of seafood tests and publishes mean mercury levels by species. Here’s how common tuna choices compare, plus what that means in micrograms per 4-oz portion.

Tuna Product	Mean Mercury (ppm)	Mercury Per 4-oz (µg)
Light, Canned	0.126	0.126 µg/g × 113 g = 14 µg
White (Albacore), Canned	0.350	0.350 µg/g × 113 g = 40 µg
Yellowfin, Fresh/Frozen	0.354	0.354 µg/g × 113 g = 40 µg
Albacore, Fresh/Frozen	0.358	0.358 µg/g × 113 g = 41 µg
Bigeye, Fresh/Frozen	0.689	0.689 µg/g × 113 g = 78 µg

Source data: FDA “Mercury Levels in Commercial Fish and Shellfish (1990–2012).” The albacore (white) canned mean is 0.350 ppm; the table also lists minimums and maximums, showing wide spread across samples.

Mercury In A Typical Can Of White Tuna — The Math

Most shoppers finish roughly one adult portion when they open a standard 5-oz can after draining. Using the FDA mean for white tuna in cans (0.350 ppm), the arithmetic is straightforward:

• 0.350 µg/g × 113 g ≈ 40 µg mercury per portion.
• If a can yields a bit more or less than 113 g when drained, the total shifts in the same direction. Double the portion, and you double the micrograms.

Is that amount “safe”? Safety guidance doesn’t rate a single can in isolation; it looks at intake over time and body weight. That’s where the next section helps.

How Safety Guidance Views Albacore

U.S. fish advice groups seafood into choices based on mercury levels. Albacore sits above light tuna, so the recommended pattern is fewer servings. The consumer Q&A states an adult serving is 4 ounces and encourages a variety of lower-mercury fish.

For readers who want the underpinning math, the Environmental Protection Agency sets a methylmercury reference dose (RfD) of 0.1 µg per kilogram of body weight per day—a level intended to be health-protective over a lifetime.

What The RfD Means In Plain Numbers

Here’s a fast way to translate the RfD into tuna portions. Multiply your body weight in kilograms by 0.1 to get a daily microgram budget. Multiply that by 7 for a weekly budget. Then see how many albacore portions fit, using ~40 µg per 4-oz portion from the FDA mean.

• 55 kg (121 lb): 0.1 × 55 = 5.5 µg/day → 38.5 µg/week → ~1 or less albacore portion weekly.
• 70 kg (154 lb): 7 µg/day → 49 µg/week → ~1 albacore portion weekly.
• 90 kg (198 lb): 9 µg/day → 63 µg/week → ~1 to 1.5 albacore portions weekly.

Those are rough guides. Mercury levels vary can-to-can, and people also eat other seafood, which shares the same “budget.” That’s why official advice emphasizes variety and portion control.

Picking Tuna With Less Mercury When You Want More Cans

If you want tuna more often, “light” cans are the simplest switch. Based on the FDA mean of 0.126 ppm, a 4-oz portion lands near 14 µg—about one-third of albacore’s typical amount. Many readers alternate: one white tuna meal for texture and flavor, then light cans for the rest of the week.

Why Albacore Runs Higher

Mercury accumulates up the marine food chain. Larger, older fish that feed on other fish tend to carry more. Albacore fit that pattern, while skipjack (commonly used for “light” cans) mature faster and stay smaller, so the levels trend lower. The FDA dataset captures this difference clearly across thousands of tests.

Serving Size Details And Where It Comes From

The adult fish portion (4 oz/113 g) comes from federal serving size conventions referenced in the fish advice materials. This is the practical unit used in the tables above and matches how most labels present nutrition per serving of seafood.

Putting It Into Weekly Eating

If your week already includes salmon, shrimp, or sardines, you’re spending part of your mercury “budget” there. That’s fine—those choices are usually much lower than albacore, which is why rotating species keeps variety up and exposure down. For those who are pregnant, may become pregnant, breastfeeding, or feeding young children, follow the federal fish advice and choose from the lists designed for those groups; the agency provides charts, serving sizes, and species lists in one place. You can read the consumer Q&A here: FDA/EPA fish advice Q&A.

What About Outliers And “Max” Values?

The FDA table doesn’t just publish averages. It also shows the highest result seen for each species. For white tuna in cans, the listed maximum is 0.853 ppm, which would be about 96 µg in a 4-oz portion. That’s not typical, but it’s why guidance leans conservative for frequent eaters and for groups that need extra caution.

A Simple Way To Track Your Intake

Use one line in a notes app for the week. Each time you eat tuna or any other fish, jot down the portion and type. If you want a quick rule of thumb for white tuna cans: count one can as one adult portion for an easy estimate, then balance the rest of the week with lower-mercury choices. Pair this with the FDA’s seafood guidance and you’ll stay on a steady path. For the source of the serving size and the “why” behind the advice, see the FDA technical information page that underpins the consumer guidance. Technical basis for fish advice.

Worked Examples You Can Copy

These examples use the FDA mean for white tuna in cans (0.350 ppm) and the EPA RfD to show how weekly totals stack up. They’re rounded to keep things simple.

Body Weight	Weekly RfD Budget (µg)	Albacore Portions/Week*
50 kg (110 lb)	35 µg	~0.9 (about one)
70 kg (154 lb)	49 µg	~1.2 (about one)
90 kg (198 lb)	63 µg	~1.6 (one to one-and-a-half)

*Assumes ~40 µg per 4-oz portion using the FDA mean for canned white tuna; actual cans vary. RfD = 0.1 µg/kg/day from EPA.

Practical Tips For The Tuna Shelf

Check The Label Language

“White” almost always means albacore. “Light” is usually skipjack, sometimes with small amounts of yellowfin. If you want to keep mercury lower while eating tuna more often, reach for light cans most of the time and save white for when you want that firm texture.

Portion And Frequency Beat Guesswork

Use the 4-oz number for quick planning. One white tuna meal in a week can fit many adults’ intake targets, especially if the rest of the seafood that week comes from lower-mercury picks like salmon, sardines, pollock, or shrimp.

Know When To Choose Other Fish

Bigeye and certain other large predators sit higher on the list. If sushi or steaks from those species are part of your routine, count those portions when you plan your week. The FDA list helps you compare at a glance. FDA mercury table.

Bottom Line For A White Tuna Can

A drained can that lands near one adult portion delivers about 40 micrograms of mercury on average, based on the FDA’s species-level testing. Keep portions at 4 ounces, choose light tuna more often when you want more cans, and use the federal fish advice as your weekly compass. For families who are pregnant, may become pregnant, breastfeeding, or serving young children, rely on the FDA/EPA materials tailored to those groups; that guidance aligns serving sizes with lower-mercury lists.