What is the largest standard Roman numeral?

3,999 (MMMCMXCIX) is the largest number representable in standard Roman numerals using I, V, X, L, C, D, M. Extended notation using vinculum (overline) allows values up to 3,999,999.

How does subtractive notation work?

IV means 4 (5-1), IX means 9 (10-1), XL means 40, XC means 90, CD means 400, CM means 900. The rule is: a smaller numeral before a larger one is subtracted.

Is there a Roman numeral for zero?

No. Roman numerals have no symbol for zero. The concept of zero as a number was developed separately in Hindu-Arabic mathematics.

Where are Roman numerals still used today?

Clock faces, chapter numbers in books, movie sequels and Super Bowl numbers, year numbering in film credits, and names of monarchs and popes (e.g., Elizabeth II).

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Roman Numeral Converter

Convert between Arabic numbers and Roman numerals — supports 1 to 3,999,999 with extended notation.

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About this tool

Instantly convert integers to Roman numerals and vice versa. Supports standard Roman numerals (1–3,999) and extended notation with vinculum (overbar) for larger values up to 3,999,999. Shows step-by-step conversion breakdown.

How to use

1 Type an Arabic number (1–3999) to convert to Roman numerals.
2 Or type Roman numeral letters to convert to an Arabic number.
3 View the step-by-step breakdown below.
4 Click Copy to copy the result.

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