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Roman Numeral Converter

Convert between Arabic numbers and Roman numerals

How to use

  1. Pick Number → Roman or Roman → Number.
  2. Enter a value (1-3999 for numbers) or a Roman numeral.
  3. See the conversion instantly and copy the result.
  4. Switch modes to convert back without reloading.

Examples

Year

2024 → MMXXIV

Small number

9 → IX (subtractive notation).

From Roman

XLII → 42.

FAQs

What range is supported?

1–3999 for numbers to Roman; common Roman numerals back to Arabic.

Do you allow lowercase?

Yes, input is uppercased for conversion.

Is the calculation local?

Yes. Everything runs in your browser; no data is stored.

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