Roman numeral converter
This converter turns ordinary numbers into Roman numerals and Roman numerals back into numbers. Each line is detected on its own, so you can mix both kinds in one list. Students, designers and anyone reading dates on buildings or film credits use it.
- Runs in your browser
- Free, no account needed
- Copy or download the result
Result
Example
2026 XIV 1999 MMMCMXCIX
2026 = MMXXVI XIV = 14 1999 = MCMXCIX MMMCMXCIX = 3999
How to use the roman numeral converter
- Type one number or Roman numeral per line, such as 2026 or XIV.
- Press Run.
- Read each conversion, then use Copy result or Download.
How it works
Numbers from 1 to 3999 are written with I, V, X, L, C, D and M using standard subtractive pairs such as IV, IX, XL, XC, CD and CM.
Roman numerals are checked against the standard form. Forms such as IIII, VX or MMMM are rejected, and the tool suggests the standard form when it can.
Lowercase letters are accepted and shown in uppercase. Up to 500 lines are allowed.
Everything runs in your browser. Your input is not uploaded or stored.
Questions and answers
What is 2026 in Roman numerals?
2026 is MMXXVI: MM for 2000, XX for 20 and VI for 6.
Why is IIII rejected?
The standard form of 4 is IV. IIII appears on some clock faces, but it is not the standard way to write 4.
What is the largest Roman numeral?
With standard letters the largest is MMMCMXCIX, which is 3999. Larger numbers need special marks that are not standard.