Fishkeeping & Aquatics

Nominal tank size lies — décor and substrate displace water, and heaters, filters, and dosing all key off the real volume. This hub gets the true numbers so your equipment, maintenance, and running costs are sized correctly.

Workflow: Tank dimensions → true water volume → equipment sizing → maintenance → operating cost

Available now

Live and ready to use. The rest of this hub is on the build list below.

Fishkeeping

Aquarium Calculator

True water volume, filled weight, heater wattage, substrate, and water changes.

All 30 calculators

Linked tools are live now; the rest are on the build list for this hub.

Aquarium Volume, Weight & Water Change CalculatorTrue water volume, filled weight, heater estimate, substrate, and water changes.Available
Bowfront Aquarium Volume CalculatorWater volume for curved-front tanks from width, depth, height, and bow.Soon
Hexagon Aquarium Volume CalculatorVolume for common hexagonal aquarium footprints.Soon
Cylinder Aquarium Volume CalculatorVolume for cylindrical tanks and round quarantine tubs.Soon
Corner Aquarium Volume CalculatorVolume for triangular and quarter-cylinder corner tanks.Soon
Aquascape Displacement CalculatorSubtracts rock, wood, substrate, and air space from nominal volume.Soon
Filled Aquarium Weight CalculatorWater, glass, substrate, rock, equipment, and stand weight.Soon
Aquarium Substrate Depth CalculatorSubstrate liters, cubic feet, and bags for a target depth.Soon
Aquarium Gravel Bag CalculatorFootprint and depth into required gravel weight or bags.Soon
Aquarium Water Change CalculatorDrain and refill volume from percentage or target remaining.Soon
Water Change Mixing CalculatorBlends source waters to a target temperature or parameter.Soon
Top-Off Reservoir Duration CalculatorDays between refills from reservoir size and evaporation.Soon
Aquarium Evaporation CalculatorWeekly loss from measured daily or historical evaporation.Soon
Aquarium Heater Wattage CalculatorStarting wattage range from volume and temperature difference.Soon
Filter Turnover CalculatorActual tank turnovers per hour after flow losses.Soon
Return Pump Flow CalculatorDelivered flow after vertical head and plumbing loss.Soon
Sump Operating Volume CalculatorNormal sump water volume from chamber size and height.Soon
Sump Power-Off Reserve CalculatorEmpty sump capacity needed for drain-down at shutdown.Soon
Overflow Flow CalculatorMeasured fill or drain time into gallons or liters per hour.Soon
Air Pump Capacity CalculatorAllocates air output across stones, sponges, and tanks.Soon
Aquarium Light Coverage CalculatorFixture count and spacing from length and coverage.Soon
Aquarium Electricity Cost CalculatorHeater, light, filter, pump, and chiller energy costs.Soon
Chiller Runtime Cost CalculatorEnergy cost from wattage, duty cycle, and utility rate.Soon
Saltwater Mix Amount CalculatorSalt mix from batch volume using the stated dose.Soon
Salinity Blending CalculatorProportions when combining two known-salinity sources.Soon
RO/DI Production Time CalculatorTime and wastewater from rated or measured rate.Soon
Food Bag Duration CalculatorHow long food lasts from daily feeding amount.Soon
Pond Volume CalculatorVolume for rectangular, oval, kidney, and irregular ponds.Soon
Pond Liner Size CalculatorMinimum liner size from pond dimensions and overlap.Soon
Pond Pump Turnover CalculatorRequired flow from pond volume and turnover interval.Soon