Aquarium Tools and Calculators

Calculate useful aquarium volume, substrate displacement and water changes from your own tank measurements.

Aquarium Tank Volume and Water Change Calculator

Calculate usable aquarium volume, substrate displacement, water change litres and water weight from your own tank dimensions. Works offline with Metric and Imperial units.

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# The water your aquarium really holds

This collection turns inside measurements into a useful working estimate. Substrate displacement and water changes stay visible instead of hiding inside a headline capacity.

# Clear geometry

  • Rectangular, cylindrical and bow front tanks with transparent assumptions.