How to use this result

Enter the internal water dimensions or planning values you can verify. Treat the result as a starting estimate, then compare it with the aquarium, equipment and livestock manufacturer’s documentation where relevant.

Assumptions and rounding

Metric values are calculated first and displayed to a practical precision. Advertised tank volume can exceed real water volume because glass thickness, substrate, hardscape and the air gap displace water.

Worked planning example

For an 80 × 35 × 40 cm internal rectangular space, gross volume is 112 litres before displacement. A realistic water volume may be lower, so equipment sizing and water-change preparation should preserve a sensible margin.

Limitations

Shape approximations, pump head, room temperature, lid design and the density of natural materials all affect real-world results. No equipment calculation overrides the care needs in an inhabitant profile.