Roman Numeral Converter

Convert between decimal numbers and Roman numerals instantly.

Category: Math · v1.0.0
Decimal to Roman
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Roman to Decimal
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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

About This Tool

This Roman numeral converter provides instant bidirectional conversion between standard decimal numbers and Roman numerals. It is ideal for students, historians, and anyone working with Roman numeral notation for clocks, outlines, or academic references. The tool handles values accurately and displays results in real time as you type.

How to Use

  1. Choose the conversion direction: decimal to Roman or Roman to decimal
  2. Enter a decimal number or type a Roman numeral string
  3. View the converted result displayed instantly below the input
  4. Copy the result to your clipboard for use in documents or projects