Roman numerals converter
Convert numbers to Roman numerals and back, 1 to 3999.
Number (1–3999)
Roman numeral
Runs locally in your browser. Nothing is uploaded.
How to use
- Type an Arabic number or a Roman numeral in either field.
- The other field updates instantly.
- Years work too, e.g. 2026 → MMXXVI.
Questions
Why only up to 3999?
Standard Roman notation has no symbol above M (1000). Larger numbers need an overline, which is not plain text.