Free Roman Numeral Converter

Convert Between Numbers and Roman Numerals

This tool converts any standard number (1 to 3999) into Roman numerals, or converts Roman numerals back into their standard numeric value, following the classical Roman numeral system used since antiquity.

How Roman Numerals Work

Roman numerals use seven basic symbols: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Numbers are built by combining these symbols, generally from largest to smallest, with their values added together. A key exception is subtractive notation: when a smaller-value symbol appears before a larger one, its value is subtracted rather than added — this is why 4 is written as IV (5 minus 1) rather than IIII, and 9 is IX (10 minus 1) rather than VIIII.

Common Uses for Roman Numerals

• Clock and watch faces — many traditional clocks display hours in Roman numerals.
• Book and document structure — chapter numbers, preface pages, and outline levels often use Roman numerals.
• Sequel and event numbering — movie sequels, Super Bowl games, and Olympic Games are traditionally numbered in Roman numerals.
• Names and titles — monarchs, popes, and some personal names use Roman numerals to distinguish generations (like Henry VIII).
• Copyright dates — sometimes displayed in Roman numerals in film credits and formal documents.

Privacy and Local Processing

All conversion happens directly in your browser — no numbers are sent to a server.