What is a Roman Numeral Converter?
Movie copyrights, clock faces, book chapters, tattoo ideas: roman numerals persist, and misreading MCMXCIV takes real effort.
Type a number or a numeral; direction is detected automatically, and non-canonical forms (like IIII or IC) are rejected rather than guessed.
Where they still turn up decides what you actually need. Film copyright lines and building cornerstones carry years, so MMXXVI is 2026 and MCMLXXXIV is 1984; clock faces and book front matter stay below 100; chapter, act and monarch numbers rarely pass XX. Years are the hard ones, because a numeral like MCMXCIV packs three subtractive pairs into seven letters.
Frequently asked questions
How do I read MCMXCIV?
Read it in place values rather than letter by letter: M is 1000, CM is 900, XC is 90 and IV is 4, so 1994. Every numeral is built that way, largest place first, with at most one subtractive pair per place.
Why is IC rejected when the arithmetic gives 99?
Because subtraction is only allowed one place value down: I may precede V and X, X may precede L and C, C may precede D and M. Ninety-nine is XCIX. This converter validates by converting its own answer back and comparing, so IC, VX and IIII are refused with a reason instead of being quietly read as 99, 5 and 4.
Why only up to 3999?
Standard notation has no symbol beyond M(1000); larger numbers historically used overlines, which don’t survive plain text.
What is subtractive notation?
A smaller symbol before a larger subtracts: IV=4, IX=9, XL=40, CM=900. Only those six pairs are valid.
Is IIII ever correct?
Clock faces traditionally use IIII for balance, but standard notation is IV: this converter enforces the standard.
Is there a zero?
No: the system predates zero as a numeral.