A calculator site built around transparent maths, useful explanations and clear limits.
Aquarium calculations are simple enough to be useful but easy to misuse when a rounded tank label, the wrong gallon system or a hidden assumption is treated as exact. This site puts the arithmetic, assumptions and worked examples on the same page as the tool.
The aim is not to replace experienced fishkeepers, veterinary care, structural advice or equipment manuals. It is to make the measurable parts of a decision easier to check.
The site does not invent a universal fish-per-litre rule, diagnose fish illness, certify floors or make a heater recommendation from an unsupported watts-per-litre constant. Where a decision depends on more than arithmetic, the page says so.
Questions about formulas or corrections can be sent through the contact details on the site. Include the page and the numbers you used so the issue can be reproduced.
Core calculations are reproducible from the formula printed on the page.
Displacement, duty cycle and turnover targets are shown as user inputs or scenarios rather than hidden facts.
A geometry tool does not pretend to diagnose fish health or choose species compatibility.
Care context and manufacturer examples are linked to the source used.
The site does not require an account, store calculator inputs on a server or sell a hidden “correct answer”. Its job is to make aquarium planning arithmetic easier to check.