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Roman Numeral Converter
Roman numerals still appear on clock faces, film credits, book chapters and monuments. Type a number on the left or a numeral on the right and the other side fills in immediately.
How to use it
- Type a number between 1 and 3999 in the first box.
- Or type a numeral such as MCMXC in the second box.
- Read the conversion, which updates on every keystroke.
Examples
- 2026 → MMXXVI.
- MCMXC → 1990, where CM is 900 and XC is 90.
- 444 → CDXLIV, subtractive at three different scales.
Questions people ask
Why does the range stop at 3999?
Because standard numerals only have symbols up to M for a thousand. Larger values need an overline to multiply by a thousand, a notation that has no single agreed plain-text form, so this converter stays inside the classical range.
Is IIII wrong on clocks?
Not exactly. Strict notation writes IV, but many clock faces have used IIII for centuries, mostly for visual balance against the VIII opposite it. This converter always produces the standard subtractive form.
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Updated: 2026-08-07