Bidirectional Conversion
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Enter a number or Roman numeral
๐ Roman Numerals Reference
I = 1
V = 5
X = 10
L = 50
C = 100
D = 500
M = 1000
IV = 4
IX = 9
XL = 40
XC = 90
CD = 400
CM = 900
About Roman Numerals
Basic Rules
- Roman numerals use 7 basic symbols: I(1), V(5), X(10), L(50), C(100), D(500), M(1000)
- The same symbol can appear at most three times (e.g., III=3, but 4 is IV not IIII)
- A smaller number before a larger means subtraction (IV=4, IX=9, XL=40, XC=90, CD=400, CM=900)
- A smaller number after a larger means addition (VI=6, LX=60, DC=600)
- Arranged left to right, largest to smallest
Common Examples
- 2024 = MMXXIV (M+M+X+X+IV = 1000+1000+10+10+4)
- 1987 = MCMLXXXVII (M+CM+L+X+X+X+V+I+I)
- 3999 = MMMCMXCIX (maximum standard Roman numeral)