What range of numbers can be converted to Roman numerals?

This tool converts standard Roman numerals in the classical range 1–3999 (I to MMMCMXCIX).

Can I convert Roman numerals back to Arabic numbers?

Yes. Enter a valid Roman numeral such as MCMXCIV and it will return 1994. The tool also flags invalid patterns.

Yes. You can enter a calendar date and convert day, month, and year into Roman numerals, often used for inscriptions.

Convert between Arabic numbers and Roman numerals, validate your Roman strings, and even convert dates like 2025-11-07 → VII • XI • MMXXV.

Enter a number (1–3999)

Roman numeral

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Enter a Roman numeral (I–MMMCMXCIX)

Arabic number

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Useful for inscriptions or fancy headings. We convert day, month, year separately.

Select a date

Date in Roman numerals

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Roman numerals are built from these symbols:

This tool enforces standard modern form (no overlines, no 5000+, no non-standard repetitions).