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.
Available now
6 live
Available
Aquarium Calculator
True water volume, filled weight, heater wattage, substrate, and water changes.
AvailableBowfront Volume
True water volume for curved-front tanks, in gallons and liters.
AvailableFilled Weight
Total loaded weight — water, glass, substrate, rock, gear, and stand — plus floor load.
AvailableSubstrate Depth
Substrate liters, cubic feet, weight, and bag count for a target depth.
AvailableWater Change
Drain and refill volume by percentage or target remaining, plus dechlorinator dose.
AvailableHeater Wattage
A starting wattage range from volume and the temperature rise over the room.
All 32 calculators
linked tools are live; the rest are on the build list- Aquarium Volume, Weight & Water Change CalculatorTrue water volume, filled weight, heater estimate, substrate, and water changes.Live
- Bowfront Aquarium Volume CalculatorWater volume for curved-front tanks from width, depth, height, and bow.Live
- 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.Live
- Aquarium Substrate Depth CalculatorSubstrate liters, cubic feet, and bags for a target depth.Live
- 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.Live
- 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.Live
- 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
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