Calculation methodology

Calculation principles

The site uses transparent first-principles arithmetic wherever the physical relationship is stable: geometry for volume, multiplication for percentage changes and energy, and component sums for weight. Inputs and formulas are shown so users can reproduce the result independently.

• Prefer internal water-space measurements for water volume.
• Keep gross geometry separate from displacement estimates.
• Keep unit conversion exact and label UK versus US gallons.
• Do not turn animal welfare, structural safety or exact equipment selection into unsupported universal formulas.
• Use external sources for husbandry or manufacturer-specific context and add original explanation rather than copying their wording.

How examples are chosen

Worked examples use round, plausible dimensions so the arithmetic can be checked mentally or with a calculator. They are examples, not recommendations for a specific fish or room. Where a manufacturer range is used, the page identifies the source and labels it as a reference example.

Editorial review

Calculator logic is tested with known inputs, pages are checked for duplicate metadata and thin content, and internal links are crawled before release. Claims that depend on external guidance are linked to the source instead of being presented as home-grown facts.

Corrections

If a formula, constant or source link appears wrong, use the contact page with the page URL and the issue. Corrections should improve the public explanation as well as the code so the methodology stays inspectable.