About this roman numeral converter
Roman numerals still label Super Bowls, movie sequels, book chapters, clocks and cornerstones. Convert any number from 1 to 3999 into Roman form, or decode a numeral like MCMXCIV back into 1994.
How to use it
- Type a number to see its Roman numeral.
- Or type a Roman numeral to decode it.
- Invalid numerals are flagged, not guessed.
The formula
M=1000, D=500, C=100, L=50, X=10, V=5, I=1\nSmaller-before-larger subtracts: IV=4, IX=9, XL=40, CM=900
Worked example
2026 = MMXXVI (1000+1000+10+10+5+1). And MCMXCIV = 1994.
Frequently asked questions
Why does it stop at 3999?
Standard Roman numerals have no symbol above M used more than three times (MMMCMXCIX = 3999). Larger numbers historically used a bar over a numeral to multiply by 1000.
Is IIII ever correct?
On clock faces, yes — IIII is traditional there. Standard notation uses IV for 4, which is what this converter produces.
What is the year 2024 in Roman numerals?
MMXXIV.