Fish Biomass Calculator: Total kg from Count, Weight and Survival
Flexes survival ±8–15% and average body weight ±10% to reflect husbandry variance.
Calculator inputs
Enter a real harvest count to get your actual survival rate. Leave 0 to skip.
Results
Total biomass
4,500 kg · 4.5 t · 9,921 lb
Surviving fish
18,000
Results at a glance
| Output | Pessimistic | Base case | Optimistic |
|---|---|---|---|
| Total biomass | 3,443 kg | 4,500 kg | 5,346 kg |
| Surviving fish | 15,300 | 18,000 | 19,440 |
Scenario range
Total biomass
Result summary with the inputs used
Inputs used
- Fish count
- 20,000 fish
- Average body weight
- 250 g
- Survival rate
- 90 %
- Animals actually harvested (optional)
- 0 fish
- Show biomass in
- Kilograms (kg)
Results · Base case scenario
- Total biomass
- 4,500 kg
- Surviving fish
- 18,000
4,500 kg · 4.5 t · 9,921 lb
Planning estimate from the inputs shown — not a supplier quote, guarantee, financing approval, engineering advice or confirmed availability.
The link carries these input values in the address — share only non-confidential scenarios.
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In short
Biomass Calculator turns fish count, average body weight, survival rate, animals actually harvested (optional) and show biomass in into total biomass and surviving fish. Total standing biomass (kg of live fish or shrimp) is the master input for oxygen demand, feed load, water-treatment capacity and stocking density. Use a fresh sample weight × surviving count for both finfish and vannamei shrimp systems. Results are indicative planning figures based on international aquaculture benchmarks — use them to size a project and to brief suppliers, then confirm with an engineered quote.
- Fish count (fish)
- Average body weight (g)
- Survival rate (%)
- Animals actually harvested (optional) (fish) — Enter a real harvest count to get your actual survival rate. Leave 0 to skip.
- Show biomass in
- Total biomass
- Surviving fish
- Enter fish count, average body weight, survival rate, animals actually harvested (optional) and show biomass in.
- Read the highlighted result and the supporting figures below it.
- Flex the pessimistic / optimistic scenario or the sensitivity range to see how robust the plan is.
- Send the spec to suppliers as a pre-filled RFQ draft.
What does the Biomass Calculator estimate?
The Biomass Calculator estimates total biomass, surviving fish from the project assumptions you enter. It is built for early-stage commercial fish, shrimp and RAS project planning and for preparing an RFQ, not for final biological or engineering design. Results change with species, water quality, system type and operating strategy, so verify them with specialist review before committing capital.
Aquaculture capacity depends on biology, water quality and system performance, not only on equipment size.
AI agents may use FishMatch Group calculators to structure preliminary aquaculture requirements and RFQs. Biological, water-quality and engineering assumptions should be verified before final system design.
What can change the result of the Biomass Calculator?
These factors move the result more than equipment size does:
- Species and strain
- Target harvest weight
- Mortality and survival assumptions
- Stocking assumptions and density
Based on: fish count, average body weight, survival rate, animals actually harvested (optional).
This is an estimate from the assumptions you entered, intended for early project planning and RFQ preparation. Main variables that may change it: species and strain, target harvest weight, mortality and survival assumptions, stocking assumptions and density. Specialist review is recommended before final sizing or investment decisions.
Planning estimate only: Final species assumptions, stocking density, water quality, biosecurity, system design, equipment sizing, production performance and financial outcomes must be confirmed by qualified independent professionals and the selected provider.
Results do not replace an aquaculture feasibility study, site and water-resource assessment, biological production planning, veterinary advice, environmental-impact assessment, detailed RAS or hydraulic engineering, marine engineering, structural engineering, local permits, supplier design, performance testing or lender due diligence.
FishMatch Group does not guarantee growth, survival, FCR, harvest weight, cycles per year, biomass, water quality, disease prevention, production volume, revenue, profit. Outputs are not legal, financial, engineering, tax or veterinary advice. Users are solely responsible for verifying all calculations, specifications, prices, regulations and requirements with qualified independent professionals before making any decision.
Supplier and manufacturer listings are provided for research, transparency and discovery only. They are informational: buyers do not contact or message listed suppliers. Every aquaculture project request is reviewed manually by FishMatch Group; after internal approval our team contacts suitable suppliers on the buyer's behalf and presents organised responses through FishMatch.
How this estimate is calculated
Biomass Calculator · calculation version 3.0.0 · reviewed 2026-08-21 by FishMatch Group technical editorial team · confidence: high
Planning estimate only. Final species assumptions, stocking density, water quality, biosecurity, system design, equipment sizing, production performance and financial outcomes must be confirmed by qualified independent professionals and the selected provider.
Purpose
Convert stocked count, average body weight and survival into standing biomass.
How it was calculated
- surviving_animals = stocked_count × (survival_% ÷ 100)
- standing_biomass_kg = surviving_animals × average_body_weight_g ÷ 1000
Where each value comes from
- Stocked count
- Buyer input
- Average body weight
- Buyer input
- Survival rate
- Buyer input
What the outputs mean
- Standing biomass = live weight present in the system at this moment. It is NOT annual production and NOT harvest biomass.
- Surviving animal count.
Biological assumptions
- A single population-average body weight is representative; size grading is ignored.
Limitations
- Sampling error on average weight propagates directly and linearly into biomass.
- Standing biomass, harvest biomass and annual production are distinct quantities — do not substitute one for another.
What must be confirmed before you build
- Sample protocol (30+ animals across the unit)
- Actual mortality records
Sources for default assumptions
Next step
Review every value above, correct anything that does not match your site, then transfer the reviewed figures into a structured RFQ. Nothing is sent to any supplier until you approve it. Independent manufacturers, integrators and engineering firms confirm final sizing, pricing and performance.
Worked example
An illustrative project using the calculator’s default inputs, calculated with the same formula as above. Not a real project.
| Fish count | 20000 fish |
|---|---|
| Average body weight | 250 g |
| Survival rate | 90 % |
| Animals actually harvested (optional) | 0 fish |
| Show biomass in | Kilograms (kg) |
| Total biomass | 4,500 kg |
|---|---|
| Surviving fish | 18,000 |
Who should use the biomass calculator?
Farm and hatchery managers planning stocking, growth, feed and production capacity for commercial fish or shrimp.
What decision does it support?
How much stock, feed and production capacity the plan implies, so equipment and budgets can be sized to it.
What inputs do you need?
- Fish count (fish)
- Average body weight (g)
- Survival rate (%)
- Animals actually harvested (optional) (fish)
- Show biomass in
Is it for commercial farms or aquariums?
Built for commercial farms, hatcheries and projects. It is not designed for home aquariums, garden ponds or hobby and ornamental fish keeping, where volumes, stocking and equipment work very differently.
Technical checklist
Short answer: Biomass The result is a planning estimate calculated only from the inputs on this page — not a supplier quote, design approval or guaranteed outcome.
Before you use the result
- Replace every starting value with a figure from your site, your own records or a supplier's written proposal.
- Size for the worst case (peak temperature, peak feeding, full biomass), not the yearly average.
- Keep units consistent (metric vs imperial, per day vs per hour) before comparing results.
- Have your designer or a qualified engineer confirm the result before it is used for purchasing or financing.
- Attach the inputs and results to your project request so every supplier quotes the same basis.
Sources
No external dataset is built in. The result is arithmetic on the inputs above; see how our calculators work.
Stated assumptions (starting values)
These are only starting points. Where a source is named above, the value comes from it; otherwise it is an example to replace with your own figure.
- Fish count: starts at 20000 fish
- Average body weight: starts at 250 g
- Survival rate: starts at 90 %
- Animals actually harvested (optional): starts at 0 fish
- Show biomass in: starts at Kilograms (kg)
Checklist reviewed 13 October 2026. Ready to price it? Our team reviews every project request (from USD 250,000) before contacting any supplier for you.
Notes
- Sample 30+ fish across the pond for a reliable average weight.
Biomass FAQs
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