About AquaMath

AquaMath exists because aquarium advice is full of numbers with no arithmetic attached. "One inch per gallon." "Fifty percent water changes." "Five watts per gallon." Fishkeepers repeat these constantly, argue about them constantly, and almost never get shown the math underneath — so we built a site that does exactly that.

What you will find here: free calculators for tank volume, stocking density, water-change nitrate dilution, substrate amounts and heater sizing, plus guides to the concepts behind them. Every tool prints its methodology on the page. Every heuristic names the source it came from, with a visible "Last verified" date, and conflicting published advice (the betta tank-size debate, the watts-per-gallon argument) is shown from both sides rather than averaged into a false certainty.

Our publishing standards: original prose only; species sizes and care facts cited to sources with editorial standards (Seriously Fish and Aquarium Co-Op are our most-cited); unit conversions exact by definition and attributed to NIST; stocking rules attributed to their published proponents; anything unverifiable is dropped, and every calculator carries the same caveat — these are heuristics, and research on your specific fish outranks any rule on this site.

We are an independent hobby project. The site is funded by clearly-disclosed affiliate links and (eventually) advertising; no brand sees our copy before you do. Corrections and source disputes are welcome at Vantoron@gmail.com — if a number here is wrong, we want to fix it.

Start with the tank volume calculator or the guide to how big a tank neon tetras, bettas and goldfish really need.