Roman Numeral Converter

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Perform bidirectional conversions between decimal integers and Roman numerals in real-time. Supports the standard range of 1 to 3,999. Includes an integrated character value cheat sheet.

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Synchronized Converter

Roman Character Cheat Sheet

I
1
V
5
X
10
L
50
C
100
D
500
M
1000
Subtractive Pairs
IV = 4
IX = 9
XL = 40
XC = 90
CD = 400
CM = 900
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