Roman Numeral Converter

How to Use

1. Enter either a regular number (1-3999) or a Roman numeral (e.g. MMXXVI).
2. The format is auto-detected and converted to the other format instantly.

How Roman Numerals Work

Roman numerals use combinations of seven letters — I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) — added or subtracted based on their order. A smaller numeral placed before a larger one is subtracted (e.g. IV = 4, IX = 9); placed after, it's added (e.g. VI = 6). This tool supports the standard range of 1 to 3999.

Common Uses

• Reading dates, movie sequel numbers, or monument inscriptions written in Roman numerals.
• Converting a year or chapter number to Roman numerals for a stylized design.
• Checking homework or verifying a Roman numeral conversion by hand.