Aquarium inputs
Aquarium water-volume calculator
Work out internal gross volume and a practical estimate of actual water.
What it calculates
Formula
Internal length × internal width × water height ÷ 1,000.
Limits
This is internal gross volume; substrate, hardscape, equipment and the unfilled rim still displace water.
Next step
Measure inside the glass, then use a net-volume estimate for flow, heating and maintenance.