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Roman Numeral Converter

Convert between Roman numerals and Arabic numbers. Supports 1 to 3,999,999. Free online converter.

Live·100% in your browser — no upload
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Reference

I1
V5
X10
L50
C100
D500
M1000

Quick Convert

How Roman Numeral Converter works

Convert between Roman numerals and Arabic numbers. Supports 1 to 3,999,999. Free online converter. Everything runs locally in your browser — nothing is sent to external servers.

  1. Enter or paste your data in the field above.
  2. The tool processes the result instantly, while your data stays on your device.
  3. Copy or download the output.

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