Roman Numeral Converter
Convert numbers to Roman numerals and vice versa. Supports large numbers up to 3,999,999 using vinculum notation.
How to Use
Our free online Roman Numeral Converter translates standard decimal numbers into Roman numerals and vice versa. It works instantly as you type and features advanced support for numbers larger than 3,999 using vinculum notation.
- Number to Roman: Type any standard number (like 2024) into the Number input box. The equivalent Roman numeral (MMXXIV) will appear below instantly.
- Roman to Number: Type any valid Roman numeral into the Roman Numeral input box to see its decimal value update above.
- Copy: Use the copy button above either field to quickly save the value to your clipboard.
About This Tool
Roman numerals are formed by combining seven basic symbols: I (1), V (5), X (10), L (50), C (100), D (500), and M (1,000).
When a smaller symbol appears after a larger one, you add them (VI = 5 + 1 = 6). When a smaller symbol appears before a larger one, you subtract it (IV = 5 - 1 = 4). This subtractive principle is used to avoid four identical characters being repeated in succession (e.g., IIII or XXXX).
Why Use This Tool
Large Numbers (Vinculum Notation)
The Romans didn't have standard symbols for numbers larger than 1,000. For larger values, they used a horizontal line over the symbol called a "vinculum", which multiplies the symbol's value by 1,000.
For example, V̅ represents 5,000 and M̅ represents 1,000,000. Unlike basic converters, our tool fully supports this notation, allowing you to convert numbers all the way up to 3,999,999.