Fish oil vs krill oil: the real cost per gram of EPA + DHA

Krill oil has a great marketing story: tiny crustaceans, phospholipid-bound omega-3s, a little astaxanthin for color, "better absorbed than fish oil." Some of that is even true. What the story leaves out is the price per gram of the thing you're actually buying — EPA and DHA — and on that number, krill oil usually loses to plain fish oil by a lot.

What you're actually paying for

You don't take an omega-3 supplement for "fish oil" or "krill oil." You take it for EPA and DHA, the two omega-3 fatty acids the research is about. General guidance lands around 250–500 mg of combined EPA + DHA per day for a healthy adult (a general NIH-style reference, not medical advice). So the only fair way to compare two bottles is cost per gram of EPA + DHA delivered — not cost per bottle, not cost per capsule.

The front-of-bottle number sabotages this on purpose. "1000 mg" is total oil; the EPA + DHA inside is a fraction of it. On krill especially, that fraction is often small.

Where krill loses the value math

Two things stack against krill oil on cost per gram of omega-3:

1. Less EPA + DHA per capsule. Krill softgels commonly carry a modest amount of omega-3 each, so hitting a daily target can take several capsules — which drains the bottle faster and multiplies your real daily cost.
2. A premium raw-material price. Krill is more expensive to harvest and is marketed as the upgrade, so the sticker sits higher to begin with.

Put those together and the cost per gram of EPA + DHA from krill is frequently several times higher than from a decent fish oil. The bottle prices might look comparable on the shelf; the omega-3-per-dollar is not.

Krill's real, narrow advantage

To be fair to krill: its omega-3s come phospholipid-bound, which is absorbed at least as well as fish oil's triglyceride form — genuinely a point in its favor, and some people find krill easier on the stomach with fewer fishy burps. That's a real, well-established tolerability/absorption edge.

But absorption being "at least as good" doesn't rescue the math when you're getting far fewer grams of omega-3 per dollar in the first place. A better-absorbed but tiny dose at a premium price still delivers less EPA + DHA per dollar than a well-absorbed generous dose at a normal price. Fish oil's triglyceride form is itself well absorbed with a fatty meal — this isn't a case of paying up to fix a bad cheap form.

How to check it yourself

Under a minute, on either bottle:

• Read the Supplement Facts panel, not the front. Find EPA + DHA per serving (add them if listed separately).
• Note the serving size — how many capsules — and servings per bottle.
• Total grams of EPA + DHA in the bottle = (EPA + DHA per serving) × servings.
• Cost per gram of omega-3 = bottle price ÷ total grams of EPA + DHA.
• Compare that number between the fish oil and the krill oil. It's usually not close.

The fish oil vs krill oil comparison runs this side by side with live pricing, and the best-value omega-3 ranking sorts current bottles by cost per effective dose so you can see where any given krill or fish oil bottle actually lands. For the whole-catalog view of how premium forms get priced, the form-premium study and full research put numbers to the pattern.

When krill might still make sense

Buy krill on purpose if the phospholipid form genuinely sits better in your stomach, you strongly prefer the smaller softgels, or fishy aftertaste is a dealbreaker that's kept you from taking omega-3s at all — an omega-3 you'll actually take beats a cheaper one you won't. Just go in knowing you're paying a real premium per gram of EPA + DHA for those comfort reasons, not buying a more effective omega-3.

Bottom line

Krill oil is absorbed at least as well as fish oil and can be gentler on the stomach — but it usually delivers far less EPA + DHA per capsule at a premium price, so its cost per gram of omega-3 often runs several times higher. For pure value, plain fish oil almost always wins. Compare cost per gram of EPA + DHA, not the sticker: see the live comparison and best-value omega-3. Shopping guidance, not medical advice.