Calculate daily EPA and DHA omega-3 requirements by health condition. Includes dietary fish intake, supplement dosing, cost estimates, and fish omega-3 content reference table.
The Fish Oil / Omega-3 Dosage Calculator determines your daily EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) requirements based on your specific health goal, accounts for dietary fish intake, and calculates the number of supplement capsules needed using your specific product's label information. EPA and DHA are long-chain omega-3 polyunsaturated fatty acids with extensive evidence for cardiovascular, neurological, and anti-inflammatory benefits.
Recommendations vary significantly by indication: general health requires ~500 mg/day EPA+DHA (equivalent to 2 fish servings per week, per AHA guidelines), while hypertriglyceridemia treatment uses prescription-strength doses of 2,000–4,000 mg/day. Pregnancy requires at least 300 mg DHA for fetal brain and retinal development. Depression research favors EPA-predominant formulations at ~1,000–2,000 mg/day. Rheumatoid arthritis benefits from 2,500–3,500 mg/day.
Critically, the omega-3 content varies dramatically between supplements. A standard 1,000 mg fish oil capsule typically contains only 180 mg EPA + 120 mg DHA (300 mg total omega-3), meaning 70% of the capsule is not EPA or DHA. Concentrated formulations can contain 500–900 mg omega-3 per 1,000 mg capsule. Understanding your supplement's actual EPA+DHA content is essential for proper dosing.
Most people don't realize that a "1,000 mg fish oil" capsule contains only 300 mg of actual EPA+DHA. This calculator bridges the gap between recommended doses and what your specific supplement actually provides, factoring in dietary fish intake to avoid both under- and over-supplementation. Keep these notes focused on your operational context.
Daily Target: condition-specific EPA+DHA (mg/day) Dietary Omega-3 = (Fish servings/week × ~500 mg) / 7 days Supplement Needed = Target − Dietary Capsules/Day = Supplement Needed / (EPA + DHA per capsule) Monthly Supply = Capsules/Day × 30 Note: standard fish oil = ~30% omega-3; concentrated = 50–90%
Result: 6–7 standard capsules/day needed (or 2–3 concentrated capsules)
Target: 2,000 mg/day EPA+DHA for cardiovascular health. Dietary: 1 fish serving/week ≈ 71 mg/day. Supplement needed: ~1,929 mg. Standard capsule (180+120=300 mg): need 7 capsules. Concentrated capsule (500+250=750 mg): need 3 capsules. The concentrated form is more practical and often more cost-effective per mg of omega-3.
The most common source of dosing errors is misreading supplement labels. A "1,000 mg Fish Oil" capsule does NOT contain 1,000 mg of EPA+DHA — it contains 1,000 mg of total oil, of which only a fraction is omega-3. Standard (unconcentrated) fish oil is ~30% omega-3 (180 mg EPA + 120 mg DHA = 300 mg). Concentrated brands achieve 50–90% omega-3. Always look at the EPA and DHA lines specifically. For therapeutic dosing (e.g., triglyceride reduction), concentrated formulations are vastly more practical.
Key clinical trials: REDUCE-IT (2018) showed 4 g/day icosapent ethyl (pure EPA) reduced cardiovascular events by 25% in statin-treated patients with elevated triglycerides. VITAL (2019) found 1 g/day EPA+DHA did NOT reduce cardiovascular events in the general population. STRENGTH (2020) showed 4 g/day EPA+DHA (combined) did NOT reduce events — raising the question of whether pure EPA is different from EPA+DHA. Current consensus: low-dose (1 g) for general health, high-dose pure EPA for CVD risk reduction in specific populations.
Global fish stocks face overfishing pressure. Sustainable omega-3 sources include: algal oil (lowest environmental impact), small pelagic fish (anchovies, sardines, herring — well-managed stocks), and fish oil certified by MSC (Marine Stewardship Council) or IFFO RS (International Fishmeal Organization Responsible Supply). Krill harvesting is debated — krill is a keystone species in Antarctic ecosystems. As demand grows, algal-derived omega-3 is increasingly seen as the most sustainable long-term solution.
EPA (20 carbons, 5 double bonds) and DHA (22 carbons, 6 double bonds) are both long-chain omega-3 fatty acids but have somewhat different biological roles. EPA is more associated with anti-inflammatory effects and cardiovascular benefits (it's the sole ingredient in Vascepa/icosapent ethyl). DHA is critical for brain structure and retinal development (especially in pregnancy/infancy) and makes up ~40% of brain polyunsaturated fatty acids. For general health, both matter. For depression, EPA-predominant formulas show more evidence. For pregnancy, DHA is prioritized.
At standard supplement doses (1–3 g/day EPA+DHA), fish oil is generally safe with few side effects beyond GI upset and fishy taste. At higher doses (>3 g/day), there's a theoretical increased bleeding risk (prolongs bleeding time), though clinical studies haven't shown significant bleeding events even at 4 g/day. The FDA considers up to 3 g/day from supplements generally safe. Doses of 4 g/day and above should be used under medical supervision. Very high doses (>5 g/day) may suppress immune function and raise LDL cholesterol.
Krill oil provides EPA+DHA in phospholipid form (vs. triglyceride in standard fish oil), which some studies suggest improves absorption. However, krill oil capsules typically contain much less EPA+DHA per capsule (50–100 mg vs. 300+ mg for fish oil), meaning you need many more capsules (and higher cost) to reach the same dose. Additionally, krill oil contains astaxanthin (an antioxidant). Head-to-head, there's no strong evidence that krill oil provides clinically superior outcomes at equivalent EPA+DHA doses. Fish oil remains more cost-effective per mg of omega-3.
No — the manufacturing process (molecular distillation) effectively removes mercury, PCBs, and dioxins from fish oil supplements. Third-party testing organizations (IFOS, ConsumerLab, NSF) verify contaminant levels. Paradoxically, fish oil supplements are typically lower in mercury than the fish they come from. Eating fish provides additional benefits (protein, vitamin D, selenium) but does carry mercury exposure — pregnant women should follow FDA guidance on fish consumption. For supplements, mercury is not a practical concern.
Algal DHA+EPA supplements are derived from microalgae — the original source of omega-3 in the marine food chain (fish get their omega-3 from eating algae). Algal oil provides good amounts of DHA and increasingly EPA (newer products). It's the best option for vegans/vegetarians. Quality studies show similar bioavailability to fish oil. The main limitation is that most algal supplements are DHA-heavy with lower EPA content, and they tend to be more expensive per mg of omega-3 than fish oil. But they're sustainable, contaminant-free, and effective.
Fish oil comes in three main forms: natural triglyceride (rTG, found in food and some supplements), ethyl ester (EE, most supplements and prescription Lovaza), and free fatty acid. Triglyceride form has ~70% better absorption than ethyl ester in some studies, especially when not taken with fat. However, when taken with a fatty meal, the difference narrows significantly. Prescription Vascepa (icosapent ethyl) is an ethyl ester that showed significant cardiovascular benefit in the REDUCE-IT trial. Form matters less than dose and consistency of use.