SSI Calculator Ultima Online

Assuming SSI refers to a composite Skill/Survivability Index used in Ultima Online, this tool provides a repeatable calculation framework. It accepts base stats, equipment modifiers, buffs, and skill weights, then produces an overall SSI value plus a component breakdown. The system is designed for players and guilds who need consistent, defensible comparisons of builds and raid plans. Core features include deterministic results, validation of inputs, and clear reporting of how each factor contributes to the final score. The tool supports multiple calculation modes and allows scenario analysis to evaluate changes in gear, buffs, or skill emphasis. Error handling focuses on domain-specific issues, such as out-of-range attributes, missing required inputs, or conflicting modifiers, returning safe defaults or explicit failures rather than misleading results. Localization considerations align with common Ultima Online conventions for numeric formatting; the tool remains neutral to currency or real-world times. Assumptions and exclusions clarify expectations: SSI is game-specific and not a real-world metric; UI behavior, persistence, or server interactions are out of scope.