All aquarium calculators

Every calculation runs locally. Results are technical starting points, not automated stocking or treatment advice.

Calculate gross and estimated net water volume for a rectangular or cylindrical aquarium.

Calculate the exact water change volume and an optional conditioner dose.

Estimate substrate volume and weight for the aquarium footprint.

Estimate required real and nominal aquarium filter flow.

Estimate a starting heater wattage from water volume and temperature difference.

Calculate monthly and yearly energy use for heaters, filters, lighting and other equipment.

Estimate total filled aquarium weight and load over its footprint.

Calculate tap and RO water proportions for a target parameter such as GH or TDS.

Convert a label dose to the actual aquarium water volume.

Calculate switch-off time, dark period and lighting energy cost.

Estimate water needed for daily and monthly top-offs.

Create a water-change, testing and filter-check schedule and download it as CSV.