Roman Numeral Converter
Convert between Arabic numbers (1–3999) and Roman numerals. Bidirectional, live conversion.
Quick Examples
Reference Table
I1
V5
X10
L50
C100
D500
M1,000
Roman numerals use subtraction notation — IV = 4 (5−1), IX = 9 (10−1), XL = 40, XC = 90, CD = 400, CM = 900.