How it works
Type a number to see it in Roman numerals, or type Roman numerals to see the equivalent number. Works for any value from 1 to 3999, the traditional range of standard Roman numeral notation.
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Roman Numeral Converter
Convert between numbers and Roman numerals, both ways.
FAQ
Why is there a limit of 3999?
Standard Roman numerals don't have a symbol for 5000 or higher without extra notation (like a bar over a numeral), so 3999 (MMMCMXCIX) is the largest number expressible with the basic letters.
Is there a Roman numeral for zero?
No — the Romans had no symbol for zero in this system; it wasn't used in Roman numeral notation.
Where are Roman numerals still used today?
Mostly on clock faces, movie copyright years, book chapters, and after names of monarchs or popes — decimal numbers replaced them for everyday counting centuries ago.