Aquarium Volume Calculator

Use our free Castle Dawn Aquatics tank calculator to find the perfect water volume for your aquarium setup

Work out litres, UK gallons and US gallons for rectangular or cylinder tanks. Choose units, add a waterline gap or scape displacement.

Aquarium type

Measurement unit

Length

Width

Height

Waterline gap (cm)

Displacement (% scape)

Litres

UK gallons

US gallons

Estimates only. Real capacity varies with glass thickness, substrate and décor.