Roman Numeral Converter

Convert between Roman numerals and Arabic numbers instantly.

Arabic → Roman

Roman → Arabic

Roman Numeral Reference

I

= 1

V

= 5

X

= 10

L

= 50

C

= 100

D

= 500

M

= 1000

IV

= 4

IX

= 9

XL

= 40

XC

= 90

CD

= 400

CM

= 900

Roman numerals use subtraction notation: IV = 4 (5-1), IX = 9 (10-1), XL = 40, XC = 90, CD = 400, CM = 900.

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