Text toolsUpdated July 2026
Free Roman Numeral Converter
Convert numbers to Roman numerals and back, directly in your browser.
Free online tool
No signup
Instant results
Browser-first privacy
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How to convert Roman numerals
- Enter a number to get its Roman numeral, or
- Enter a Roman numeral to get its number.
- Both directions update instantly.
Common use cases
- Convert a birth year or event year to Roman numerals for a tattoo or engraving
- Decode a Roman numeral date on a building or movie
- Check a Roman numeral conversion for a school assignment
Frequently asked questions
Is this Roman numeral converter free?
Yes. It is completely free, with no signup and no limits.
What's the largest number this supports?
3999 — the largest value representable in standard Roman numeral notation without special extended symbols.
Does this validate Roman numerals?
Yes — an invalid or non-standard Roman numeral (like IIII instead of IV) will show an error rather than a wrong number.