Roman Numeral Converter
Turn a number into Roman numerals, or decode Roman numerals back into a number.
How to use Roman Numeral Converter
- Choose Number → Roman or Roman → Number.
- Enter your value (numbers from 1 to 3999 are supported).
- The converted result appears automatically.
Frequently asked questions
What's the valid range for converting a number to Roman numerals?
1 to 3999 — standard Roman numerals have no symbol for zero or for numbers at or above 4000, so anything outside that range just shows "Out of range".
Does converting from Roman numerals catch invalid or non-standard input?
It catches unrecognized letters, but it doesn't strictly enforce canonical form — a non-standard sequence like "IIII" will still be summed up rather than flagged as malformed.
Community
Loading...