The core maths used by the calculators, separated from care and equipment decisions that are not universal formulas.
These formulas are the arithmetic used across the site. Units matter. The examples below use centimetres and litres because the conversion is direct.
The site exposes its arithmetic so a result can be independently checked.
Stocking, fish health, structural safety and exact heater selection are not reduced to universal equations here. Those decisions depend on species, building structure, equipment design or environmental conditions that a generic page cannot observe.
Each tool page explains which inputs are measured facts, which are user choices and which are only scenario assumptions. That distinction is more important than hiding the formula behind a button.
Calculations use the full numerical inputs and round only the displayed result. If you round the dimensions first and then multiply, the error can become larger on big tanks because the dimensions are multiplied together.