Fish Oil Label Maths: EPA, DHA, Capsule Count and Cost Per Serve
You have five fish-oil products sitting in an online cart, and each one seems to use a different idea of value. One bottle has more capsules. One says one-a-day. Another carries the largest fish-oil milligram number. One has fewer softgels but much more EPA plus DHA. The last costs more upfront but may last longer than it first appears.
At checkout, the question is not simply which bottle looks biggest or which capsule costs least. The useful comparison is a 30-day receipt showing what the labelled routine supplies, how long the pack lasts and what that routine costs.
Direct answer: To compare fish oil supplements, first add the EPA and DHA in the complete labelled serve. Then calculate serves per pack, cost per labelled serve and, where useful, cost per 1,000 mg EPA plus DHA. Fish-oil milligrams, capsule price and bottle price should not be compared in isolation. The same method works across Healthy's fish oil capsules and liquids.
Ledger 1: What active omega-3 does the labelled serve provide?
Start by copying four separate figures from the label:
- Total fish oil
- Total omega-3
- EPA
- DHA
Do not merge those fields. A product can carry a large fish-oil number while providing a smaller amount of total omega-3, and EPA plus DHA may be smaller again.
For this comparison, add EPA and DHA because the combined figure gives a clean way to compare two declared marine omega-3 fats across different products.
Combined EPA plus DHA per serve = EPA per complete serve + DHA per complete serve
EPA plus DHA is not the only useful label information. Total omega-3 can include other omega-3 fats, while added nutrients and the full ingredient list may matter to the shopper. The point is to keep each figure in its own field so one number does not stand in for the whole formula.
For a wider explanation of different omega oils, see Healthy's guide to flaxseed oil and omega oils in New Zealand. This article stays focused on fish-oil label maths rather than repeating the plant-versus-marine comparison.
Ledger 2: What does the routine require?
The next ledger is about the work the routine asks of you. Record:
- Capsules, softgels or measured liquid per serve
- Serves per day in the standard label direction
- Units or millilitres in the pack
- Serves per pack
- Estimated pack duration
A one-capsule calculation is only a daily calculation when the label identifies one capsule as the standard daily serve. If the directions say one to three capsules daily, keep that range visible. You can show a per-capsule comparison and a labelled range, but you should not quietly choose the highest or lowest amount as the right personal dose.
Liquids need the same discipline. Record the measured volume per serve and the bottle volume. A half-teaspoon to one-teaspoon direction creates a duration range, just as a one-to-three capsule direction does.
Ledger 3: What are you paying for?
Once the first two ledgers are complete, the price calculations are straightforward.
Serves per pack = units in pack divided by units per serve
Cost per labelled serve = current pack price divided by serves per pack
30-day cost = cost per standard labelled day multiplied by 30
Cost per 1,000 mg EPA plus DHA = cost per serve divided by combined EPA plus DHA per serve, multiplied by 1,000
Use the same unit throughout the calculation. If one product lists EPA and DHA per capsule and another lists them per two-softgel serve, convert both to a clearly labelled common basis before comparing them.
All worked product arithmetic below is calculated from current declared product information and prices checked on 17 July 2026. It is not independent laboratory verification. Prices, promotions and availability can change.
When the value metrics disagree
Several products can each appear to offer value, depending on the question being asked:
| Metric | What it tells you | What it can miss |
|---|---|---|
| Lowest bottle price | Smallest checkout spend today | Pack duration and EPA plus DHA supplied |
| Lowest price per capsule | Cost of each physical unit | How many units make a serve |
| Lowest cost per labelled serve | Cost of following the standard label routine | Different EPA plus DHA amounts per serve |
| Lowest cost per 1,000 mg EPA plus DHA | Price relative to declared EPA plus DHA concentration | Routine fit, added nutrients and personal suitability |
| Lowest monthly spend | Estimated 30-day budget at the labelled rate | Whether the serves being compared contain similar amounts |
| Fewest capsules | Potential convenience | Capsule size, price and complete formula |
A value metric only answers the question built into its calculation. That is why a lower cost per serve can sit beside a higher cost per 1,000 mg EPA plus DHA, or a higher bottle price can sit beside a longer pack duration. There is no need to force every metric into one universal winner.
The routine-friction cost
Arithmetic cannot tell you whether a product will be easy to use consistently. Before choosing, consider capsule size, capsule burden, one-a-day convenience, liquid measuring, taste or flavour, storage requirements, allergens and the complete ingredient list.
Added vitamin D, vitamin E, rosemary extract or flavouring should remain outside the EPA plus DHA calculation. They are separate parts of the formula. Their presence may matter to some shoppers, but it does not increase the declared EPA plus DHA figure, prove freshness or guarantee shelf stability.
Fewer capsules are not automatically better. A larger softgel may be difficult for one person, while another may prefer a two-softgel serve to measuring liquid. A product that looks efficient on paper can still be poor value for an individual if it sits unused in the cupboard.
Shoppers comparing fish oil with krill, flaxseed, hemp or other oils can also browse Healthy's essential fatty acids and oils range, while keeping the different fat types and label units separate.
The Healthy 30-Day Basket Builder
Healthy carries several carefully curated fish-oil formats, so the useful retailer role is to show distinct shopping routes rather than name one best product. The table below uses declared labels and current prices to compare options in the high-strength fish oil collection.
| Shopping route | Declared EPA plus DHA | Units per serve | Pack duration | Current cost basis | Routine consideration |
|---|---|---|---|---|---|
|
Compact everyday capsule GO Fish Oil 2000mg |
360 mg EPA + 240 mg DHA = 600 mg per capsule | Label directions: 1 to 3 capsules daily | 230 capsules provide about 230 days at 1 daily or about 77 days at 3 daily | Calculated from declared product information: NZD 50.70 per pack, about NZD 0.22 per capsule and NZD 0.37 per 1,000 mg EPA plus DHA when calculated per capsule. The 30-day label range is about NZD 6.61 to NZD 19.84 | Compact capsule format, but the one-to-three daily range must stay visible |
|
One-a-day formula GO Fish Oil 1 A Day + Vit D1000 IU |
540 mg EPA + 360 mg DHA = 900 mg per softgel | 1 softgel is the labelled one-a-day serve | 90 or 200 labelled days, depending on pack variant | Calculated from declared product information: 90 pack at NZD 39.00 is about NZD 0.43 per serve, NZD 0.48 per 1,000 mg and NZD 13.00 for 30 labelled days. The 200 pack at NZD 50.00 is about NZD 0.25 per serve, NZD 0.28 per 1,000 mg and NZD 7.50 for 30 labelled days | Variant size materially changes the value calculation. Vitamin D3 stays outside the EPA plus DHA maths, and not everyone is looking for added vitamin D |
|
Concentrated EPA and DHA formula Pro EPA/DHA Advanced |
540 mg EPA + 405 mg DHA = 945 mg per capsule | Label directions: 1 to 3 softgels daily | 120 softgels provide 120 days at 1 daily or 40 days at 3 daily | Calculated from declared product information: NZD 43.70 per pack, about NZD 0.36 per capsule and NZD 0.39 per 1,000 mg EPA plus DHA when calculated per capsule. The 30-day label range is about NZD 10.93 to NZD 32.78 | Contains vitamin D3. The one-capsule arithmetic is not a universal daily cost because the label gives a range |
|
Two-softgel high-potency serve Ultimate Omega X2 |
1,125 mg EPA + 875 mg DHA = 2,000 mg per two-softgel serve. Total omega-3 is 2,150 mg per serve | 2 softgels per labelled serve | 60 softgels provide 30 labelled serves | Calculated from declared product information: NZD 117.80 per pack, about NZD 3.93 per labelled serve and NZD 1.96 per 1,000 mg EPA plus DHA | A higher cost per serve coincides with a much larger EPA plus DHA serve. That does not prove better value, greater effectiveness or suitability |
|
Liquid-format pathway Ultimate Omega Liquid |
Record the EPA and DHA stated for the measured serving volume | Use the measured liquid direction on the current label | Duration depends on bottle volume and the measured daily amount | No worked price comparison is shown because serving volume, bottle volume and current price must be verified on one consistent basis | May suit shoppers who prefer measuring liquid to swallowing softgels. Taste, storage and accurate measuring matter |
The Basket Builder does not rank the products. It separates declared active-fat amounts, pack duration, current cost and routine fit so you can choose what fits your own comparison question.
Safety stop signs before checkout
Fish oil is a supplement, not a replacement for medicines, professional care or a balanced diet. Follow the current product label and ask a qualified health professional or pharmacist before use when relevant.
Professional review is especially important if you use blood-thinning or anticoagulant medicines, anticipate surgery, are pregnant or breastfeeding, are choosing for a child, have a fish or seafood allergy, take regular medicines, manage a diagnosed health condition or are considering professionally directed higher-dose omega-3 use.
Do not stop or change prescribed medicines because of a supplement article. Healthy can help with product information, but medical suitability belongs with an appropriate health professional. For product-choice help, use the Healthy contact page.
The one-minute checkout test
- Have I found EPA plus DHA for the complete serve?
- Do I know how many units make the serve?
- Do I know how long the pack lasts?
- Am I comparing products on the same cost basis?
- Does the format and complete formula suit my routine?
If all five answers are clear, the cart should make more sense than it did when you started. You are no longer choosing from front-label numbers alone. You have a 30-day view of the declared serve, capsule or liquid burden, pack duration and current cost.
Frequently asked questions
Is 1000 mg fish oil the same as 1000 mg omega-3?
No. A label may list 1000 mg of fish oil while the amount of total omega-3, EPA and DHA is lower. Record fish oil, total omega-3, EPA and DHA as separate figures.
How do I compare EPA and DHA on fish-oil labels?
Find the EPA and DHA amounts for the complete labelled serve, then add them together. Check how many capsules or how much liquid makes that serve before comparing products.
Should I compare cost per capsule, cost per serve or cost per 1,000 mg EPA plus DHA?
Use the measure that fits your question. Cost per capsule shows unit price, cost per serve reflects the labelled routine, and cost per 1,000 mg EPA plus DHA compares declared active-fat concentration. Looking at more than one measure usually gives a clearer picture.
How do I calculate how long a bottle of fish oil will last?
Divide the number of capsules, softgels or measured liquid serves in the pack by the number used per labelled day. Keep any label range visible rather than choosing one end of the range for everyone.
Is high-strength fish oil always better value?
No. A higher EPA plus DHA amount may reduce capsule count, but price, serving size, pack duration, added ingredients and routine fit can change the value calculation.
Why can two products with similar fish-oil milligrams have different EPA and DHA amounts?
Fish oil is the source material, while EPA and DHA are specific omega-3 fats within it. Different concentrates can provide different EPA and DHA amounts even when front-label fish-oil numbers look similar.
Does one-a-day fish oil automatically mean better value?
No. One-a-day may reduce routine friction, but value still depends on EPA plus DHA per softgel, pack size, current price and the complete formula.
What should I check besides EPA, DHA and price?
Check capsule size, units per serve, taste or flavour, liquid measuring, storage, allergens, added nutrients, other ingredients and whether the format is realistic for your routine.
Who should ask a health professional before taking fish oil?
Professional advice is important for people using blood-thinning or anticoagulant medicines, anticipating surgery, pregnant or breastfeeding people, children, people with fish or seafood allergy, anyone taking regular medicines or managing a diagnosed condition, and anyone considering professionally directed higher-dose omega-3 use.
References
- Healthify NZ: Omega-3 and fish oil supplements
- Healthify NZ: Fats and oils
- NIH Office of Dietary Supplements: Omega-3 fatty acids consumer fact sheet
- NIH Office of Dietary Supplements: Omega-3 fatty acids health professional fact sheet
- Heart Foundation NZ: Dietary supplements and heart health
- Heart Foundation NZ: Warfarin and your diet
Educational supplement information only. This article does not diagnose, treat, prevent or cure any condition. Follow product labels and ask a qualified health professional if you are unsure about suitability, medicines, pregnancy, breastfeeding, allergies, children or higher-dose use.