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Roman Numerals

Convert any number (1-3999) to Roman numerals or back. Validates standard subtractive notation.

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Number → Roman
=MCMXC
Range 1–3999.
Roman → Number
=1990

How to use

  1. 1
    Convert in either direction
    Number → Roman or Roman → number, both panels are live.
  2. 2
    Validates non-canonical Roman
    "IIII" is rejected; "IV" is accepted.

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