Roman Numeral Converter
Convert between decimal numbers and Roman numerals in both directions. Enter a number (1-3999) or a Roman numeral string and get the equivalent instantly, with the symbol table on hand.
Conversion
Roman numerals only support integers from 1 to 3999. Type in either field and the other fills in instantly.
Result
Type a number to see the result.
Symbol equivalence
I
1
V
5
X
10
L
50
C
100
D
500
M
1000
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Frequently asked questions
What's the highest number it supports?+
3999 (MMMCMXCIX), following classical Roman notation. Higher values need extended notation with vinculum (overlines).
Why is 90 written XC and not LXXXX?+
Because of the subtractive rule: a smaller numeral before a larger one means subtraction. The tool only accepts standard notation.