Roman Numerals Converter: Numbers to Roman and Back (1–3999)

Write a year, chapter or clock number in Roman numerals, or read one you have found. Put one per line to convert many at once.

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How to use the roman numerals converter

  1. Type or paste your text (one item per line where it says so).
  2. Pick the options; the result updates as you type.
  3. Copy or download the result.

Questions

What is the largest number?

3999 (MMMCMXCIX). Bigger numbers need a bar over the letters, which plain text cannot show.

Why does it say “not written the standard way”?

Forms like IIII or VX are not standard. The tool shows the correct form, for example IV for 4.

Is my data private?

Yes. Everything happens inside your own browser: nothing you type or choose is uploaded to us or anyone else.

Is it free?

Completely free, with no sign-up, no watermark and no limit on how many times you use it. Light ads keep the site running.