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Roman Numeral Converter
Convert any number (1–3999) to Roman numerals, or decode a Roman numeral back to a number.
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
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Roman numeral symbols
- I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
How do Roman numerals work?
Roman numerals are written from largest to smallest, left to right, and values are added. When a smaller value appears before a larger one, it is subtracted. For example, IV = 5 − 1 = 4, and IX = 10 − 1 = 9.
What is the largest Roman numeral?
Standard Roman numerals go up to 3,999 (MMMCMXCIX). Larger numbers historically required a bar over a numeral (vinculum) to multiply by 1,000, but these are rarely used today.
Common Roman numerals
- Year 2024 = MMXXIV
- Super Bowl LVIII = 58
- Chapter XII = 12
- Queen Elizabeth II = 2