Roman Numeral Converter

Convert between numbers and Roman numerals

Instantly convert Arabic numbers (1-3999) to Roman numerals and vice versa.

Enter Number (1-3999)

Quick Reference

M
1000
CM
900
D
500
CD
400
C
100
XC
90
L
50
XL
40
X
10
IX
9
V
5
IV
4
I
1

About Roman Numerals

Basic Rules

  • I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
  • Symbols are written largest to smallest, left to right
  • Add values of symbols (VI = 5 + 1 = 6)
  • If smaller before larger, subtract (IV = 5 - 1 = 4)
  • Only I, X, and C can be subtracted
  • Only one smaller value before larger

Examples

  • III = 3
  • IV = 4
  • IX = 9
  • XL = 40
  • XC = 90
  • CD = 400
  • CM = 900
  • MMXXIV = 2024

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