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Conversion Mode
Common Examples
Current Year
2024 → MMXXIV
Super Bowl
XLIX → 49
Movie Sequel
4 → IV
21st Century
XXI → 21
Book Title
1984 → MCMLXXXIV
Clock Number
XII → 12
Roman Numeral Reference
Basic Symbols
I
1
V
5
X
10
L
50
C
100
D
500
M
1000
Conversion Rules
Addition Rule
When a smaller numeral appears after a larger one, add the values.
Example: VI = V + I = 5 + 1 = 6
Subtraction Rule
When a smaller numeral appears before a larger one, subtract the smaller.
Example: IV = V - I = 5 - 1 = 4
Repetition Rule
I, X, C, and M can be repeated up to 3 times. V, L, and D cannot be repeated.
Example: III = 3, but not IIII
Order Rule
Numerals are written from largest to smallest, left to right.
Example: MCMLXXXIV (1984)