Calculation and editorial methodology
A calculator is useful only when its assumptions are visible. We document the formula, test boundary cases and separate mathematical outputs from practical claims.
Formula verification
Core arithmetic is implemented in reusable pure functions and covered by automated tests. Reviews include ordinary examples, zero and boundary values, invalid input and rounding behaviour. A page explains the assumptions that materially change its answer.
Casino algorithms are not universal. A provably-fair result is labelled as a generic reference unless it matches a named operator's published specification exactly.
Editorial review
We use first-party documentation, primary mathematical definitions and observed search demand to decide what a page must answer. Competitor pages may reveal missing topics, but their wording is never copied.
Pages are reviewed after formula changes, material content updates or evidence that search intent has shifted. The review date is not changed for cosmetic deployments.
Corrections
If you find a reproducible error, report the input, expected result and page URL through the public issue tracker. We investigate calculation errors before editorial preferences and document the correction in version control.