Every calculator is a standalone function with automated tests. Test cases come from worked examples in published standards or from hand calculation, and the expected value is written next to each test.
Code tables are stored as data with the section number cited. We link to the section and explain it in our own words; we do not reproduce code text.
Found an error? See Contact. Every correction is recorded in the corrections log.
Review and update dates
Each calculator and guide shows when its page last changed. A "Reviewed" line appears only after a qualified person has checked that page, and it names them. Pages without it have not had an independent review.