Werkery

Roman Numerals Converter

Convert between Roman numerals and Arabic numbers. Supports values 1–3999 using standard subtractive notation (IV, IX, XL, XC, CD, CM).

Tool by ·
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How it works

  1. 1
    Type a number
    In either Arabic or Roman field.
  2. 2
    Read
    The other side updates live.

Frequently asked

Why only up to 3999?

Standard Roman numerals can't represent 4000+ without overlines (vinculum). MMMCMXCIX = 3999 is the largest classical-style value.

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Tool designed and editorially reviewed by Felix Brübach. Text drafted with AI assistance and reviewed for legal and factual accuracy before publication. Not legal advice — for complex cases, consult a lawyer.
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