Convert tools

Roman Numeral Converter

Convert integers from 1 to 3999 into Roman numerals, or decode canonical Roman notation back to decimal.

Convert in your browser · No sign-up

Uses subtractive forms such as IV and IX. Zero, negative numbers, overbars and noncanonical forms such as IIII are rejected.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

How to use

  1. Convert integers from 1 to 3999 into Roman numerals, or decode canonical Roman notation back to decimal.
  2. Choose the mode or options, then run the tool.
  3. Review the result, then copy or download the TXT file.

Example

2026 → MMXXVI

Details and limitations

Uses subtractive forms such as IV and IX. Zero, negative numbers, overbars and noncanonical forms such as IIII are rejected.

Text stays in your browser; it is not sent to a conversion server.

FAQ

Roman Numeral Converter — What are the supported inputs and limits?

Uses subtractive forms such as IV and IX. Zero, negative numbers, overbars and noncanonical forms such as IIII are rejected.

Format references

Tool page updated: