How to use our calculator and editorial content responsibly. The honest version, not the cover-our-eyes version.
The Aquacanvas tank volume calculator returns an approximation of the water capacity of an aquarium based on the dimensions you enter. It is intended as a planning aid and a sanity check, not as a precise measurement tool.
Real-world tank volume is influenced by factors the calculator cannot see — the actual internal dimensions vs. external; the depth of your substrate; the volume of rocks, wood, and decor; the fill level you choose; the height at which the tank sits; and minor manufacturing variation between glass panels. We've built the tool to be as accurate as a calculator of this kind reasonably can be, but it is not a substitute for measuring your tank's actual water with a flow meter or a marked vessel when precision matters.
If you are using our calculator's output to dose medications, treatments, or chemical additives, you do so at your own risk. Always follow the manufacturer's instructions on the product itself. The label on a bottle of fish medication has been written by a manufacturer with regulatory obligations and a specific safety margin in mind; an internet calculator has not.
For sensitive treatments (copper-based parasiticides, peroxide treatments, anything with a narrow therapeutic window), we strongly recommend physically measuring the actual water volume during a fill, rather than relying on a geometric calculation. Round down rather than up when in doubt — a slightly underdosed treatment can usually be topped up; a slightly overdosed one cannot be undone.
The "inches of fish per gallon" figure shown in the calculator's results panel is a rough heuristic intended to flag obvious overstocking — nothing more. It does not account for species-specific bioload, schooling requirements, swimming style, adult versus juvenile size, or compatibility between species.
Before adding any fish to a tank, research the specific species: its adult size, its temperament, its preferred water parameters, and the minimum tank dimensions recommended by reputable fishkeeping sources. The calculator can tell you whether a stocking plan is geometrically possible. It cannot tell you whether it's a good idea.
Articles published on Aquacanvas reflect the opinions and experience of the author at the time of writing. Fishkeeping is an evolving hobby — best practices change, species' welfare requirements are continually re-evaluated, and equipment improves. Where an article is older than 18 months, please cross-reference its claims against more recent sources before acting on them.
Aquacanvas is not a substitute for professional veterinary care for sick fish. If your fish is showing signs of disease, isolating the cause and consulting an aquatic veterinarian is the right course of action — particularly for valuable specimens or rare species.
Where we link to external sites — academic papers, fishkeeping forums, manufacturer pages — we do so because we believe they're useful. We don't control their content and aren't responsible for it.
The site, its calculators, and its content are provided "as is", without warranty of any kind, express or implied. To the fullest extent permitted by law, Aquacanvas accepts no liability for any direct, indirect, incidental, or consequential loss arising from use of the site or reliance on its content.
If you've spotted an error, found a calculation you don't trust, or want to challenge a claim in one of our articles — please tell us. We'd rather correct something than be quietly wrong.