Work out aquarium volume instantly with clear inputs, formula shown and shareable results.
Multiplies the internal dimensions by the actual water depth, and converts the volume into gallons and the mass of water.
Tank volume
Litres = length (cm) x width (cm) x water depth (cm) / 1000; one litre of fresh water weighs one kilogram
Tanks are never filled to the rim, and substrate and rock displace water, so actual depth gives the usable volume.
A 270 litre tank holds about 270 kg of water plus glass and substrate, which few pieces of household furniture can carry.