Tank volume calculator
Work out how much water a rectangular tank holds from its inside size.
Use inside dimensions: glass thickness makes outside measurements read larger than the water space.
Rock, sand and equipment displace water, so real water volume is lower than this box volume.
This is a rough estimate. Do not use it as an exact figure for dosing.
How this is calculated
Volume is length x width x water depth. With centimetres the box volume is divided by 1,000 to give litres; with inches it is divided by 231 to give US gallons.
Rock, sand and equipment displace water, so the real water volume is lower than this box volume.