24 free calculators

Every number your aquarium plan needs.

Fast, transparent tools for tank setup, maintenance, water preparation and equipment. No registration and no measurements stored.

Aquarium Volume Calculator

Calculate litres, US gallons and UK gallons from your tank dimensions.

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Aquarium Litres to Gallons Converter

Convert litres, US gallons and Imperial gallons without mixing up the units.

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Net Aquarium Water Volume Calculator

Estimate real water volume after substrate, hardscape and equipment displacement.

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Aquarium Weight Calculator

Estimate the total filled weight of water, tank, stand, substrate and décor.

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Aquarium Substrate Calculator

Estimate litres, kilograms and pounds of sand, gravel or aquasoil.

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Aquarium Heater Size Calculator

Estimate heater wattage from net water volume and room temperature.

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Aquarium Filter Flow Calculator

Estimate litres per hour or gallons per hour from target turnover.

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Aquarium Electricity Cost Calculator

Estimate monthly kWh and running cost for aquarium equipment.

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Aquarium Water Change Calculator

Find exactly how many litres or gallons to remove and replace.

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Aquarium Nitrate Water Change Calculator

Estimate the water change needed to dilute nitrate toward a target level.

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Marine Aquarium Salt Calculator

Estimate dry marine salt for a target salinity and water volume.

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Aquarium Sump Volume Calculator

Calculate the operating water volume inside a rectangular sump.

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Aquarium Drain-Down Volume Calculator

Estimate how much display water may return to the sump during a power stop.

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Aquarium Evaporation & Top-Off Calculator

Estimate daily and weekly freshwater top-off volume.

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Aquarium Dosing Calculator

Scale a product label dose to your aquarium's net water volume.

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Aquarium Water Hardness Converter

Convert German degrees of hardness and ppm as calcium carbonate.

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Planted Aquarium Lighting Calculator

Estimate a starting lumen range from aquarium volume and planting intensity.

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Aquarium Air Pump Size Calculator

Estimate a starting air-output range from water volume.

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Aquarium Chiller Flow Calculator

Estimate a target pump-flow range through an aquarium chiller.

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Aquarium RO Water Mixing Calculator

Estimate tap and RO water volumes for a target TDS blend.

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Bow Front Aquarium Calculator

Estimate the volume of a bow front fish tank in litres and gallons.

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Cylinder Aquarium Calculator

Calculate round and column fish tank volume from diameter and height.

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Hexagon Aquarium Calculator

Calculate regular hexagon fish tank volume from one side panel and height.

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Corner Aquarium Calculator

Estimate quarter-circle corner fish tank volume in litres and gallons.

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