Roman Numeral Converter
Convert numbers to Roman numerals and back — anywhere from 1 to 3999, with a live breakdown.
How to use
Type a number (1–3999) to see its Roman numeral, or type a Roman numeral to get the number — both update live. The breakdown chips show how the numeral is built from its additive pieces (for example 2026 = M + M + X + X + V + I). The Roman side is validated, so only proper numerals convert back.