Aquarium Calculators
Essential tools for freshwater and saltwater aquarium hobbyists. Calculate tank volume, fish stocking levels, equipment sizing, water parameters, and maintenance schedules for healthy, thriving aquatic environments.
Aquarium Calculators
Browse aquarium calculators for tank volume, stocking, filtration, dosing, and fish care planning.
Aquarium Air Pump Size Calculator
Estimate aquarium air pump airflow, outlet count, and reserve aeration margin from tank size, depth, stocking, and device load.
CO2 Drop Checker Color Guide Calculator
Interpret drop checker color with pH and KH to estimate aquarium CO2 ppm, compare against planted-tank targets, and spot fish-stress risk.
Calcium & Alkalinity Demand Calculator
Estimate reef tank calcium and alkalinity demand, starting two-part doses, and kalkwasser equivalents from coral load and chemistry targets.
Carbon Dosing Calculator
Estimate starting carbon dose, weekly ramping, oxygen risk, and nitrate reduction timing for reef tanks using vodka, vinegar, sugar, or NoPox-style products.
Aquarium CO2 Injection Calculator
Calculate optimal CO2 injection rates for planted aquariums. Get bubble rate recommendations, estimate cylinder duration, and calculate CO2 levels from pH and KH readings.
Drip Acclimation Timer Calculator
Calculate drip acclimation time, final dilution volume, discard water, and safety guidance for aquarium fish, corals, and invertebrates.
Fish Stocking Order Planner
Plan the order to add aquarium fish using tank-type rules, aggression ranking, conflict warnings, and a staged stocking timeline.
KH/GH Hardness Calculator
Calculate aquarium KH or GH dose requirements using baking soda, buffers, Equilibrium, crushed coral, or Epsom salt with split-dose guidance.
Aquarium Filter Flow Rate Calculator
Calculate optimal aquarium filter flow rate in GPH/LPH based on tank volume, stocking level, and tank type for proper filtration and water quality.
Nitrate & Phosphate Dilution Calculator
Calculate how many water changes are needed to lower aquarium nitrate or phosphate, including refill-water effects and correction timeline planning.
Aquarium Fertilizer Dosing Calculator
Calculate optimal fertilizer doses for planted aquariums using EI, PPS-Pro, or lean dosing methods with NPK and micronutrient targets.
Aquarium Heater Size Calculator
Calculate the right wattage aquarium heater based on tank volume, room temperature, and target temperature with single and dual heater recommendations.
Aquarium Lighting Calculator
Calculate optimal aquarium lighting intensity in lumens and watts for planted, fish-only, or reef tanks with PAR estimates and photoperiod recommendations.
Aquarium Medication Dosing Calculator
Calculate accurate aquarium medication doses based on actual water volume with adjustments for sensitive species and re-dosing guidance.
Aquarium Nitrogen Cycle Calculator
Track aquarium nitrogen cycle progress with test readings, calculate fishless cycle ammonia dosing, and estimate when your tank is ready for fish.
Ozone Dosing Calculator
Estimate reef ozone starting dose, ORP-based adjustment, safety zone, and time-to-target from total system volume and ozonizer capacity.
Aquarium Evaporation Rate Calculator
Calculate daily aquarium water evaporation based on surface area, temperature, humidity, and tank type. Plan ATO reservoir sizing and understand salinity impact.
Aquarium Salt Mix Calculator
Calculate the amount of marine salt needed for your target salinity. Perfect for water changes, new tank setup, and maintaining optimal salinity in reef and marine aquariums.
Specific Gravity & Salinity Converter
Convert aquarium specific gravity, ppt salinity, and refractometer readings with temperature correction and reef-safe interpretation.
Aquarium Ammonia Toxicity Calculator
Calculate actual toxic ammonia (NH3) from total ammonia readings based on pH and temperature. Determine danger levels and when emergency action is needed.
Aquarium Chiller Sizing Calculator
Estimate aquarium chiller BTU load, horsepower recommendation, and monthly operating cost from system size, room temperature, and equipment heat.
Aquarium Electricity Cost Calculator
Estimate monthly and annual aquarium electricity cost from heaters, pumps, skimmers, lights, and support equipment with a device-level breakdown.
Aquarium Substrate Calculator
Calculate exact aquarium substrate amounts in pounds and kilograms for gravel, sand, or planted substrates based on tank dimensions and desired depth.
Aquarium Tank Volume Calculator
Calculate aquarium water volume in gallons and liters for rectangular, cylindrical, bow front, and hexagonal tanks with displacement estimates and equipment recommendations.
Aquarium Temperature Adjustment Calculator
Estimate safe aquarium temperature change timing, heater adequacy, and total time to target from volume, wattage, and room conditions.
Aquarium Water Change Calculator
Calculate optimal water change volume and frequency based on tank size, nitrate levels, and stocking density for healthy aquarium maintenance.
Aquarium Fish Stocking Calculator
Calculate safe fish stocking levels for your aquarium based on tank volume, species bio-load, and filtration capacity with multi-species support and schooling warnings.
Aquarium Fish Compatibility Calculator
Check fish compatibility before adding new species to your aquarium. Analyze temperament, water parameters, tank size requirements, and potential conflicts between fish species.
Aquarium Breeding Tank Calculator
Calculate optimal breeding tank setup for your fish species. Get recommendations for tank size, water parameters, spawning conditions, and fry rearing requirements.
Aquarium Quarantine Tank Calculator
Calculate quarantine tank requirements for new fish, sick fish treatment, and disease prevention. Get tank size, equipment, and medication dosing recommendations.
Quarantine Medication Schedule Calculator
Build a quarantine medication timeline for ich, velvet, brooklynella, bacterial infection, or flukes with dose planning, daily tests, and fallow guidance.
Aquarium Protein Skimmer Calculator
Calculate the right protein skimmer size for your marine aquarium based on tank volume, bioload, and system type. Get air draw and pump recommendations.
Aquarium Refugium/Sump Calculator
Design and size your sump and refugium. Calculate section dimensions, flow rates, and return pump requirements for optimal reef tank filtration.
Aquarium Water Flow Calculator
Calculate optimal water flow and circulation for your aquarium. Get recommendations for powerhead placement, return pump sizing, and turnover rates for reef and freshwater tanks.
Sump Return Pump Sizing Calculator
Estimate sump return pump flow at real installed head using turnover target, pipe size, head height, and fitting friction.
Reverse Osmosis Waste Water Calculator
Estimate RO and RO/DI waste water, waste ratio, total feed water, product TDS, and water cost for aquarium purification.
Bioload & Oxygen Demand Calculator
Estimate fish oxygen demand from biomass, temperature, and agitation to check whether an aquarium has a safe oxygen margin.
Live Rock Quantity Calculator
Estimate how many pounds of live rock, dry rock, or ceramic structure your aquarium needs based on tank size and aquascape density.
pH Buffer & pH Adjustment Calculator
Estimate a safe daily buffer dose to raise aquarium pH while accounting for KH and avoiding overly fast correction.
Saltwater Aquarium Magnesium Calculator
Estimate how much magnesium supplement to add to a reef tank and spread the correction across safe daily dosing steps.
Coral Growth Rate & Frag Yield Calculator
Project coral growth and likely frag yield from coral type, frag count, time horizon, calcium, alkalinity stability, and lighting quality.
Planted Tank CO2 Demand Calculator
Estimate planted-tank CO2 demand, target pH, starting bubble rate, and rough cylinder duration from tank size, pH, KH, and lighting demand.
UV Sterilizer Sizing Calculator
Estimate aquarium UV sterilizer wattage, max effective flow, and exposure effectiveness for algae, bacteria, or protozoa treatment goals.
Pond Volume Calculator
Estimate pond gallons, liters, baseline pump sizing, filter capacity, and conservative fish counts from pond shape and depth.
Reef Tank Two-Part Dosing Calculator
Estimate reef correction doses, maintenance dosing, and monthly cost for two-part calcium and alkalinity supplementation.
Stocking Level Inch-Per-Gallon Calculator
Estimate aquarium stocking percentage with an improved inch-per-gallon model adjusted for tank type, filtration, substrate, and species bioload.
About Aquarium Calculators
Professional Fishkeeping Tools
Our aquarium calculators provide accurate measurements for tank volume, fish stocking, equipment sizing, and water chemistry to help you maintain healthy aquatic ecosystems.
For All Aquarium Types
Whether you're setting up a freshwater community tank, planted aquarium, reef system, or fish-only marine tank, these tools support proper planning and ongoing maintenance.
Key Features
- Multiple tank shape support
- Displacement calculations
- Equipment recommendations
- Metric and imperial units