Numbers & Dates
Roman Numeral Converter
Type a number or a Roman numeral — the other updates instantly.
Type in either field — the other updates instantly. Standard Roman numerals cover 1–3999.
Why only up to 3999?
No symbol may repeat more than 3 times in a row. The largest symbol is M (1,000), so the max is MMM + CMXCIX = 3,999. Writing 4,000 would require MMMM — four Ms — which violates the rule.
How it works
How it works
Symbol values
I
1
V
5
X
10
L
50
C
100
D
500
M
1,000
Addition rule
Symbols in descending order are added together.
VIII = 5 + 1 + 1 + 1 = 8
Subtraction rule
A smaller symbol before a larger one is subtracted. Only 6 valid pairs:
Example: 2024
2000 = MM
24 = XXIV
2024 = MMXXIV
How it works▾
How it works
Symbol values
I
1
V
5
X
10
L
50
C
100
D
500
M
1,000
Addition rule
Symbols in descending order are added together.
VIII = 5 + 1 + 1 + 1 = 8
Subtraction rule
A smaller symbol before a larger one is subtracted. Only 6 valid pairs:
Example: 2024
2000 = MM
24 = XXIV
2024 = MMXXIV