Omega-3 Calculator
Find your daily recommended omega-3 fatty acid intake based on sex. Use it to assess whether your diet or supplementation meets the adequate intake (AI) for heart and brain health.
About this calculator
Omega-3 fatty acids are essential polyunsaturated fats that the body cannot synthesize on its own, meaning they must come from diet or supplements. The three main types are ALA (alpha-linolenic acid), EPA (eicosapentaenoic acid), and DHA (docosahexaenoic acid). The National Academies of Medicine sets an Adequate Intake (AI) for total omega-3s primarily based on ALA: 1.6 g/day for adult males and 1.1 g/day for adult females. The formula is: Daily AI = 1.6 g if male; 1.1 g if female. These targets reflect the minimum needed to prevent deficiency; many cardiologists recommend higher EPA+DHA intakes (0.5–1.0 g/day) for cardiovascular benefit. Rich sources include fatty fish, flaxseed, chia seeds, and walnuts.
How to use
Example: A 35-year-old male. Step 1 — Enter age: 35. Step 2 — Select gender: male. Applying the formula: gender = male → AI = 1.6 g/day. Result: This man should aim for at least 1.6 grams of omega-3 ALA per day. One tablespoon of flaxseed oil provides about 7.3 g of ALA — well above the AI — while a 3-oz serving of Atlantic salmon provides roughly 1.8 g of combined EPA and DHA, which more than satisfies the recommendation.
Frequently asked questions
What is the difference between ALA, EPA, and DHA omega-3 fatty acids?
ALA (alpha-linolenic acid) is a plant-based omega-3 found in flaxseed, chia, and walnuts, and it serves as the baseline for the Adequate Intake reference value. EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are long-chain omega-3s found primarily in fatty fish and algae, and they are the forms most directly linked to cardiovascular and cognitive health benefits. The body can convert ALA to EPA and DHA, but the conversion rate is very inefficient (under 10%). For maximum health benefit, direct consumption of EPA and DHA through fatty fish or algal supplements is recommended.
Why do men need more omega-3 than women according to the adequate intake guidelines?
The difference in the Adequate Intake (1.6 g for men vs. 1.1 g for women) is based on body size and observed dietary patterns in healthy populations rather than any fundamental metabolic difference. Larger body mass generally correlates with higher absolute nutrient requirements. Notably, women actually convert ALA to EPA and DHA more efficiently than men, partly due to estrogen's role in fatty acid metabolism. During pregnancy, women's omega-3 needs increase substantially to support fetal brain development.
How much omega-3 should I get from fish versus supplements?
Dietary guidelines generally recommend eating fatty fish such as salmon, mackerel, sardines, or trout at least twice a week, providing roughly 500 mg of combined EPA+DHA per day on average. Fish oil or algal oil supplements are a practical alternative for those who dislike fish or follow a plant-based diet. Most cardiologists recommend 1,000 mg/day of EPA+DHA for general heart health and higher doses (2,000–4,000 mg) under medical supervision for elevated triglycerides. Look for third-party tested supplements to ensure purity and accurate dosing.