Roman Numeral Converter

This tool provides reliable, bidirectional conversion between Roman numerals and Arabic numbers. It accepts a Roman numeral string (uppercase I, V, X, L, C, D, M) or an Arabic integer (1–3999) and returns the equivalent value in the other notation. Internally, the Roman-to-Arabic path scans symbols left to right, applying subtractive rules (IV, IX, etc.) and accumulating a total, while the Arabic-to-Roman path uses a descending, greedy map to produce a canonical Roman form. The system validates input ranges and canonical forms, returning structured errors for invalid data. It is suitable for study, algorithm development, archival data processing, and quick checks in coding workflows. The tool’s canonical output and strict range enforcement ensure consistent results for automation and data integrity. Users benefit from deterministic conversions, reduced manual lookup, and an auditable transformation path. The approach supports rapid integration into data pipelines, education platforms, and documentation workflows where numeric normalization is required. By adhering to standard Roman notation up to 3999, it avoids ambiguity in historical references and software literals, while remaining simple to integrate in scripts and tools. This yields improved accuracy in datasets containing mixed numeral formats and enhances reproducibility in research and development contexts.