Editorial policy
We publish calculator explanations that are useful, transparent and easy to verify.
Research and formulas
Universal mathematics is checked against worked examples. Rules that can change should be supported by current authoritative sources before publication.
Review and corrections
Pages show a review date when a real review occurred. Corrections should update the relevant formula, explanation, tests and date together.
Sourcing principles
We prefer governments, standards bodies, universities and primary documentation when a source is necessary. We do not create fake authors, reviews, ratings or credentials.