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Roman Numerals Converter

Convert between Roman numerals and numbers

Examples

Basic Roman Numerals

I
= 1
Can be repeated up to 3 times (III = 3)
V
= 5
Cannot be repeated
X
= 10
Can be repeated up to 3 times (XXX = 30)
L
= 50
Cannot be repeated
C
= 100
Can be repeated up to 3 times (CCC = 300)
D
= 500
Cannot be repeated
M
= 1000
Can be repeated up to 3 times (MMM = 3000)

Subtraction Rules

IV = 4 (5 - 1)
IX = 9 (10 - 1)
XL = 40 (50 - 10)
XC = 90 (100 - 10)
CD = 400 (500 - 100)
CM = 900 (1000 - 100)

Important Notes

  • Roman numerals are written from largest to smallest, left to right
  • Only I, X, and C can be used as subtracting numerals
  • A smaller numeral before a larger one means subtraction
  • Maximum value is 3999 (MMMCMXCIX)

Roman Numerals Converter Tool

Convert between Arabic numbers and Roman numerals with our comprehensive converter tool. Perfect for students, historians, educators, and anyone working with classical numbering systems. Our tool supports numbers from 1 to 3999 and provides instant, accurate conversions in both directions.

Roman Numerals Features

  • Bidirectional conversion between Arabic and Roman numerals
  • Support for numbers 1-3999 (standard Roman numeral range)
  • Real-time conversion as you type
  • Educational examples and explanations
  • Copy results with one click
  • Reference chart for learning Roman numerals
  • Error handling for invalid inputs
  • Mobile-friendly responsive design

Perfect For

  • Students learning classical numbering systems
  • History teachers creating educational materials
  • Academic researchers working with historical documents
  • Clock makers and designers using Roman numerals
  • Architects and artists incorporating classical elements
  • Movie and book creators using Roman numerals for sequels
  • Event planners creating formal invitations
  • Anyone needing accurate Roman numeral conversions

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