Design your RAS with confidence
A professional recirculating aquaculture system design calculator. Size your biofilter, aeration, pumps, degasser, and more — backed by proven engineering formulas.
Everything you need for RAS design
From quick feasibility checks to full commercial production planning — one platform covers it all.
14 Calculation Modules
- •Gas physics, dissolved oxygen saturation, and O₂ balance
- •TGC growth modelling and mass balance (feed, TAN, CO₂, TSS)
- •Biofilter sizing — MBBR, fluidised sand, trickling, or fixed-bed
- •Flow rates, pump sizing, tank geometry, and mechanical filtration
- •CO₂ degasser, aeration and O₂ supply, heating and cooling loads
- •Water exchange rates and complete Bill of Materials
32 Species Database
- •18 finfish — salmon, barramundi, trout, tilapia, kingfish, and more
- •7 crustaceans — shrimp, prawn, crayfish, lobster (Pro tier)
- •4 bivalves and 3 seaweed species for IMTA designs
- •Water quality targets, growth coefficients, and stoichiometric constants pre-populated
Quick Estimate Mode
- •Get a rapid system overview in just 3 steps
- •Ideal for early-stage feasibility or comparing species
- •Full results with colour-coded warnings and design summary
Full Design Wizard
- •8-step guided wizard for detailed RAS design
- •Configure tank geometry, biofilter type, aeration, degassing, and thermal loads
- •Interactive flow diagram showing your system layout
- •Print-ready PDF reports with Bill of Materials
Commercial Production
- •Production-target sizing — set your harvest goal and the system sizes itself
- •Multi-stage nursery-to-harvest planning with modular RAS units
- •Per-cycle or per-year production targets with multi-RAS splitting
IMTA & Polyculture
- •Multi-species integrated systems with nutrient coupling calculations
- •Combine finfish, shellfish, and seaweed in a single design
- •Nutrient reduction analysis showing extractive species effectiveness
Plans
Start free. Upgrade when you need more.
Free
$0Full-featured RAS design calculator — no credit card required.
- ✓18 finfish species (32 total with Pro)
- ✓Complete system sizing (14 modules)
- ✓Quick Estimate & full 8-step design wizard
- ✓Print-ready PDF reports & Bill of Materials
- ✓Unlimited calculations
Pro
Most PopularAdvanced production planning for serious RAS designers.
- Everything in Free, plus:
- ✓Crustacean species (shrimp, prawn, crayfish, lobster)
- ✓Commercial production mode (target-driven sizing)
- ✓Multi-stage nursery-to-harvest planning
- ✓Production target & multi-RAS sizing
- ✓Unlimited saved designs & no ads
- ✓Design version history
- ✓Priority design support
Coming soon
- ○Bivalve & seaweed calculators
- ○IMTA / polyculture calculator
- ○Economic analysis / CAPEX-OPEX calculator
- ○Full system BOM & supplier directory access
- ○RAS design & hatchery manual resources
Institutional
For universities, research centres, and commercial operators.
- Everything in Pro, plus:
- ✓White-label reports (your branding)
- ✓Team access & shared design library
- ✓Dedicated support
- ✓Volume licensing available
How it works
From species selection to a complete system design in minutes — no spreadsheets required.
Quick Estimate
Get a rapid mass balance and production summary in 3 steps. Select your species, set stocking parameters, and instantly see oxygen demand, feed rates, and flow requirements.
Try Quick EstimateAdvanced Design
Design a complete RAS with an 8-step guided wizard. Configure tank geometry, biofilter type, aeration, degassing, and thermal loads — then export a print-ready PDF report.
Try Advanced DesignChoose your species
Select from 32 species across finfish, crustaceans, bivalves, and seaweed. Water quality targets, growth coefficients, and stoichiometric constants are pre-populated automatically.
Enter your design parameters
Use Quick Estimate (3 steps) for rapid feasibility, or the full 8-step wizard to configure tank geometry, biofilter type, aeration, degassing, thermal loads, and more.
Run the calculation
The engine simultaneously solves gas physics, growth model, mass balance, flow rates, biofilter sizing, pump sizing, aeration, degassing, and thermal loads in a single click.
Review & export
Browse colour-coded results section by section, review the Bill of Materials, resolve any design warnings, then export a print-ready PDF report.
Get in Touch
Need a custom RAS design, independent expert review, or tailored engineering advice? The team at LoTech Aquaculture is here to help.