Number ↔ Roman numeral.
Converts between Roman numerals and Arabic numbers.
Roman numerals use I, V, X, L, C, D, M with subtractive notation (IV = 4, IX = 9).
The subtractive notation (writing a smaller numeral before a larger one to mean subtraction) wasn't standard in ancient Rome — it became the convention centuries later, which is why some historical inscriptions show 4 as IIII rather than IV.
1994 → MCMXCIV. Break it down: M (1000) + CM (900) + XC (90) + IV (4).
Classical Roman numerals only go up to 3,999 (MMMCMXCIX). Larger values use vinculum notation.
Book chapters, movie sequels, clock faces, and monarch numbering.
No — the Roman numeral system has no symbol for zero, since the concept of zero as a number wasn't part of the system when it was developed.