IEC 62443 Security Level Calculator

Set a target Security Level (SL-T) for an OT/ICS zone, work through the requirement checklist mapped to the seven IEC 62443 Foundational Requirements, and the calculator derives your achieved Security Level (SL-A) per FR and overall — using the standard’s cumulative rule (you only reach a level once every requirement up to it is met, and the zone SL is limited by its weakest FR). You get a target-vs-achieved radar, a ranked gap list with remediation, and CSV/Markdown export. Runs entirely in your browser — nothing is uploaded.