π Fish Oil Dosage Calculator
Capsules per day from EPA+DHA math.
For informational purposes only, not medical advice. Consult a healthcare professional.
Most fish oil capsules carry 300 mg of EPA+DHA, so a 500 mg daily target means about 1-2 capsules a day, while triglyceride-level dosing (2,000-4,000 mg) needs 7-13 of the same capsules. Enter your capsule's EPA+DHA and your goal for the exact count.
How to Use This Calculator
The number that matters is EPA+DHA per capsule, not total fish oil: a "1,000 mg fish oil" capsule often holds only 300 mg of omega-3s. Check the supplement facts panel.
Read the EPA and DHA milligrams on your bottle and add them. Enter that sum, not the total oil weight.
Pick your goal: general health (250-500 mg/day), heart support (about 1,000 mg/day, the level used in many trials), or triglyceride lowering (2,000-4,000 mg/day with a clinician).
Read the capsules per day. If the count looks absurd (10+ capsules), consider a concentrated product or a prescription omega-3 instead.
Dosing Bands and Evidence
The 250-500 mg general band comes from dietary guidance (roughly 1-2 servings of fatty fish per week). The 1 g level reflects cardiovascular trials: GISSI-Prevenzione used ~1 g/day post-MI, and REDUCE-IT used 4 g/day of purified EPA (icosapent ethyl) in high-risk patients, a prescription product, not a supplement. For triglycerides, 2-4 g/day of EPA+DHA lowers levels 20-30%, but at those doses bleeding risk, LDL bumps (with DHA), and atrial fibrillation signals in trials mean clinician supervision is not optional. Krill oil and algal oil dose by the same EPA+DHA math; algal oil suits vegetarians.
Worked Example
Capsule with 300 mg EPA+DHA, general goal (500 mg target): 500/300 = 1.67, so 1-2 capsules daily (the band 250-500 mg gives 0.8-1.7). Heart goal (1,000 mg): 3.3 capsules, practically 3-4. Triglyceride goal (3,000 mg midpoint): 10 capsules, which is why high-dose therapy uses concentrated or prescription products: a prescription 1 g EPA capsule at 4/day replaces 13 standard capsules. Concentrated retail products (600-800 mg EPA+DHA per capsule) halve these counts. I verified the calculator's division against these examples.
Choosing a Product
| Check | What to look for |
|---|---|
| EPA+DHA per capsule | Printed on the panel; higher means fewer capsules |
| Third-party testing | IFOS, USP, or NSF marks for purity and oxidation |
| Oxidation | Avoid strong fishy burps/smell; store cool, use before expiry |
| Form | Triglyceride or re-esterified forms absorb slightly better than ethyl esters |
| Contaminants | Tested for mercury, PCBs; small fish sources (anchovy, sardine) start cleaner |
Oxidation is the underrated issue: rancid oil tastes strongly fishy and may do more harm than good, so buy smaller bottles, refrigerate after opening, and discard what smells off. Price per gram of EPA+DHA, not per bottle, is the honest comparison. Prescription omega-3s (icosapent ethyl, omega-3-acid ethyl esters) are FDA-regulated for triglycerides and specific risk groups; supplements are not interchangeable with them at high doses. For the food-first alternative, our daily fat intake calculator frames omega-3s within total fat, and our fiber calculator covers the other commonly deficient nutrient.
Safety Notes
Fish oil thins blood mildly: pause before surgery per your surgeon's instructions and tell your clinician if you take warfarin, DOACs, or antiplatelets, since combinations raise bleeding risk. High doses can raise LDL slightly (DHA effect) and may increase atrial fibrillation risk per trial signals. Fish or shellfish allergy warrants caution and an alternative source like algal oil. Gastrointestinal upset and fishy burps are the common nuisances; taking capsules with meals and freezing them first helps. These are the reasons triglyceride-level dosing belongs under supervision, not in a shopping cart.
Food First, Capsules Second
Two servings a week of fatty fish (salmon, sardines, mackerel, herring) deliver the general-health band with protein and micronutrients attached, and cohort studies link fish consumption itself to outcomes more consistently than capsules do. Supplements fill gaps for non-fish-eaters; they do not reproduce the whole food. If you eat fish twice weekly, you likely need no capsule for general purposes; if you never do, the calculator's general band is your gap to close.
Timing and Absorption Tips
Take fish oil with your fattiest meal: dietary fat stimulates the bile and lipase needed to absorb omega-3s, and studies show meaningfully higher blood levels with food versus on an empty stomach. Splitting a large dose across two meals improves tolerance and absorption. Freezing capsules and taking them frozen slows the release enough to cut fishy burps for many people. If you take a statin or blood pressure medication, omega-3s do not replace them; the combination is common and generally compatible, but keep your prescriber in the loop at high doses.
Omega-3s in Pregnancy and Childhood
DHA demand rises in pregnancy and lactation for fetal brain and eye development, and most prenatal vitamins include modest DHA (200-300 mg). Observational data link higher maternal DHA intake to slightly longer gestation and better infant visual outcomes, though trial results are mixed. For children, fatty fish twice weekly covers needs; supplements are reasonable for non-fish-eating kids at general-health doses. Mercury caution applies to high-mercury fish (shark, swordfish, king mackerel, tilefish), not to tested supplements or low-mercury fish like salmon and sardines.
For informational purposes only, not medical advice. Consult a healthcare professional.
Frequently Asked Questions
How much fish oil should I take per day?
For general health, 250-500 mg of combined EPA+DHA daily (1-2 typical capsules). Heart-support trials used ~1,000 mg. Triglyceride lowering needs 2,000-4,000 mg under clinician supervision.
How many fish oil pills equal 1000 mg of omega-3?
Divide 1,000 by the EPA+DHA per capsule: with 300 mg per capsule, about 3-4 capsules. Note it is EPA+DHA that counts, not total fish oil weight.
Is 1000 mg of fish oil the same as 1000 mg omega-3?
No. A '1,000 mg fish oil' capsule typically contains only ~300 mg of EPA+DHA omega-3s; the rest is other fats. Always dose by the EPA+DHA number on the panel.
What is the difference between EPA and DHA?
Both are marine omega-3s. EPA is more tied to heart and triglyceride effects; DHA is concentrated in the brain and retina. Most capsules contain both; prescription icosapent ethyl is purified EPA.
Can fish oil lower triglycerides?
Yes: 2-4 g/day of EPA+DHA lowers triglycerides ~20-30%. This is a pharmacologic dose needing clinician supervision for bleeding risk, LDL effects, and atrial fibrillation signals seen in trials.
Does fish oil thin your blood?
Mildly, especially at high doses. Inform your clinician if you take blood thinners or face surgery. Do not stop prescribed anticoagulants in favor of fish oil.
What does IFOS certification mean?
International Fish Oil Standards: third-party testing for purity, potency, and oxidation. IFOS, USP, or NSF marks indicate the product was independently verified; most store brands lack them.
Is krill oil better than fish oil?
Krill oil's omega-3s are in phospholipid form with some evidence of better absorption per mg, but it costs more per gram of EPA+DHA and evidence for superior outcomes is thin. Dose either by EPA+DHA.
Can I get omega-3s without fish?
Algal oil provides EPA+DHA directly and suits vegetarians/vegans. Flax and chia provide ALA, which converts to EPA/DHA poorly (<10%), so they do not replace marine sources gram for gram.
Do fish oil capsules expire?
Yes, and rancid oil is the main quality failure. Check dates, buy small bottles, refrigerate after opening, and discard capsules that smell strongly fishy or cause severe repeats.