Validation & limitations

For each calculator: what it checks and the standard or method behind each result, the independent reference cases its engine is tested against (68 cases across 41 tools — 13 of them document a conservative simplification), and the checks it does not make. Every reference case is an automated regression test; sources are cited, never reproduced.

See also the standards reference (what each standard covers and which parts are implemented), the symbols glossary and the disclaimer.