Fish Growth Calculator: SGR Formula and Days to Harvest
SGR flexed ±15–20% to reflect health, temperature and feed-quality variance.
Calculator inputs
Results
Time to harvest
≈ 6.2 months
Weight multiplier
16.7×
Results at a glance
| Output | Pessimistic | Base case | Optimistic |
|---|---|---|---|
| Time to harvest | 234 days | 188 days | 163 days |
| Weight multiplier | 16.7× | 16.7× | 16.7× |
Scenario range
Time to harvest
Result summary with the inputs used
Inputs used
- Starting weight
- 30 g
- Target harvest weight
- 500 g
- SGR (% body weight/day)
- 1.5 %
Results · Base case scenario
- Time to harvest
- 188 days
- Weight multiplier
- 16.7×
≈ 6.2 months
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.
Turn this result into 1–3 supplier quotes
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How supplier matching works
- 1. Private brief. Your spec goes only to manufacturers we have selected for the right category, capacity and export experience.
- 2. Confidential outreach. Suppliers see the technical spec — not your name, company or exact location — until you accept a quote.
- 3. Comparable quotes. Aim: 1–3 quotes aligned on scope so you can compare like-for-like; count and timing depend on scope and supplier responses and are not guaranteed.
- 4. Financing intro (optional). If needed, we introduce your project to a financing partner. No fee to buyers.
How long does it take to grow fish to harvest size?
Growth follows temperature, feed and stocking density. Tilapia commonly reach 500 g in 5–7 months at 26–30 °C, vannamei reach 18–20 g in 90–110 days, and salmon need 14–24 months to 4–5 kg. Enter your start weight, target weight and water temperature for an indicative cycle time.
In short
Fish Growth Calculator turns starting weight, target harvest weight and sgr (% body weight/day) into time to harvest and weight multiplier. Specific Growth Rate (SGR) is the daily % weight gain. Use it to estimate days from stocking to market-size harvest. 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.
- Starting weight (g)
- Target harvest weight (g)
- SGR (% body weight/day) (%)
- Time to harvest
- Weight multiplier
- Enter starting weight, target harvest weight and sgr (% body weight/day).
- 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 Fish Growth Calculator estimate?
The Fish Growth Calculator estimates time to harvest, weight multiplier 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 Fish Growth Calculator?
These factors move the result more than equipment size does:
- Species and strain
- Water temperature profile
- Feeding strategy and FCR
- Target harvest weight
Based on: starting weight, target harvest weight, sgr (% body weight/day).
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, water temperature profile, feeding strategy and fcr, target harvest weight. 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
Fish Growth Calculator · calculation version 0.9.0 · reviewed 2026-08-21 by FishMatch Group technical editorial team · confidence: planning estimate · methodology review pending
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
Specific Growth Rate (SGR) is the daily % weight gain. Use it to estimate days from stocking to market-size harvest.
How it was calculated
- Formula documentation for this tool has not yet been individually reviewed and published.
Where each value comes from
- Starting weight
- Buyer input
- Target harvest weight
- Buyer input
- SGR (% body weight/day)
- Buyer input
Limitations
- This tool has not yet passed the documented-methodology review. Treat every output as an unverified planning estimate.
- SGR drops as fish grow — split the cycle into 2–3 phases for a more accurate estimate.
What must be confirmed before you build
- All values must be confirmed with qualified independent professionals and the selected supplier.
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.
| Starting weight | 30 g |
|---|---|
| Target harvest weight | 500 g |
| SGR (% body weight/day) | 1.5 % |
| Time to harvest | 188 days |
|---|---|
| Weight multiplier | 16.7× |
Who should use the fish growth 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?
- Starting weight (g)
- Target harvest weight (g)
- SGR (% body weight/day) (%)
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: Growth days 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.
- Verify before you buy: Growth rate for your strain, temperature and feed — local trial data beats book values.
- 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.
- Starting weight: starts at 30 g
- Target harvest weight: starts at 500 g
- SGR (% body weight/day): starts at 1.5 %
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
- SGR drops as fish grow — split the cycle into 2–3 phases for a more accurate estimate.
What this result is — and is not
- Use: Days to harvest weight from a specific growth rate.
- Planning estimate, not a supplier quote or guarantee. It only reflects the inputs above.
- Verify before you buy: Growth rate for your strain, temperature and feed — local trial data beats book values.
Is your project a fit?
FishMatch Group handles commercial B2B projects with a total budget of USD 250,000 or more — new farms, hatcheries, RAS, cages, processing or expansions. The buyer sends one brief; our team reviews and structures the RFQ, then approaches suitable suppliers on the buyer's behalf. Buyers are not put in direct contact with manufacturers at this stage. Smaller or idea-stage projects can start with the calculators below and send the RFQ once scope and budget are clearer.
Which inputs change the estimate and the RFQ?
Calculator results and supplier quotes both depend on: species and life stage, production target (tonnes per year or PL per cycle), water source and quality (temperature, salinity, flow), system design (pond, cage, RAS, hatchery, processing), site and access, energy supply and price, permits, and timeline.
Calculator figures are planning estimates based on stated assumptions — not engineering designs or supplier quotes. Growth, survival and output depend on project-specific biology and operating conditions and are never guaranteed. Formulas, assumptions and sources: calculator methodology.
1. Size it
2. Equipment & project sourcing
Send a structured RFQ. A person checks scope and budget before any supplier is approached.
Start the project RFQ3. Financing (separate)
Financing is a separate track. FishMatch Group does not lend or guarantee financing.
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