Supported range

The converter supports standard Roman numeral values from 1 to 3999, including subtractive forms such as IV, IX, XL, XC, CD, and CM.

Why this can be useful

Roman numerals still appear in outlines, clocks, section labels, event names, and historical references. Quick conversion reduces formatting mistakes.

Validation behavior

When converting from Roman notation, invalid combinations are rejected so you can rely on canonical and correctly formatted results.