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Roman Number Converter
Convert between Roman numerals and Arabic numbers with ease
Enter a number between 1 and 3999
Roman Numerals Guide
I
= 1
IV
= 4
V
= 5
IX
= 9
X
= 10
XL
= 40
L
= 50
XC
= 90
C
= 100
CD
= 400
D
= 500
CM
= 900
M
= 1000
Rules to Remember:
Numerals must be written from largest to smallest
I, X, C can be repeated up to 3 times
V, L, D cannot be repeated
Subtraction only with I, X, C before larger numerals
Conversion History
No conversion history yet
About Roman Numerals
Roman numerals originated in ancient Rome and were used throughout the Roman Empire. They are still used today in various contexts like clock faces, book chapters, and movie credits.
Maximum supported number: 3999 (MMMCMXCIX)
No concept of zero in Roman numerals
Case insensitive (IV = iv = Iv)
Follows additive and subtractive principles
Common Uses Today:
Clock and watch faces
Book volumes and chapters
Movie release years
Monuments and building dates