Roman Numeral Converter

Two-way converter for the standard range 1–3999. Enter an Arabic number or a Roman numeral—conversion is instant and uses the same engine as every encyclopedia page on this site.

Number or Roman numeral

Examples: 49 → XLIX · MCMLXXXVII → 1987

Standard symbols

Symbol	Value
I	1
V	5
X	10
L	50
C	100
D	500
M	1000

Subtractive notation

Form	Value
IV	4
IX	9
XL	40
XC	90
CD	400
CM	900

Invalid forms such as IIII are rejected; the converter suggests the canonical form when possible.

Popular conversions

4 = IV 9 = IX 40 = XL 49 = XLIX 90 = XC 99 = XCIX 400 = CD 500 = D 900 = CM 1000 = M 1987 = MCMLXXXVII 1999 = MCMXCIX 2026 = MMXXVI 3999 = MMMCMXCIX

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