How to use it
A clear, quick workflow
- Choose Number → Roman or Roman → Number.
- Enter a value; the canonical result appears instantly.
- Copy the result, swap direction, or load the example.
Roman Numeral Converter
Convert canonical Roman numerals and numbers from 1 to 3999.
Enter a value to convert.
Example
2026 becomes MMXXVI, and XLIX becomes 49.
Limits and behavior
This tool uses the common modern canonical convention for integers 1–3999. It rejects zero, negatives, fractions, noncanonical forms such as IIII or IC, and historical variants outside that convention.
FAQ
Why is IIII rejected?
The supported canonical convention writes 4 as IV. Historical inscriptions used other forms, but this converter deliberately validates one consistent modern form.