Our Methods & Correction Policy

Each released calculator has an independent example, explicit formula and input constraints. We test normal values, invalid inputs and key boundaries, and do not publish unfinished engines as tools. For spreadsheets, CSV parsing follows RFC 4180-style quoting rules, and exported cell content is escaped to reduce spreadsheet-formula injection risk. See RFC 4180 and the OWASP CSV injection guidance. The site does not include live marketplace pricing, regulatory rates or professional design approvals. Reported errors will be investigated, corrected and regression tested. We identify limitations rather than claiming every possible edge case is covered.