NumbersHistoryLatin
Roman Numeral Converter
Convert numbers between standard integers and Roman numerals up to 3,999.
Decimal
Standard Integer
Roman
Numeral String
Reference
Standard Rules
I 1
V 5
X 10
L 50
C 100
D 500
M 1000
Quick Look
Subtraction Rules
IV 4
IX 9
XL 40
XC 90
CD 400
CM 900
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