Roman Numeral Converter

About the Roman Numeral Converter

Roman numerals still appear on clocks, book chapters, movie sequels and monuments. This converter turns a number from 1 to 3999 into Roman numerals, and turns a Roman numeral back into an ordinary number.

How to use the Roman Numeral Converter

1. Type a number from 1 to 3999, or a Roman numeral such as MCMXCIV.
2. The converted value appears straight away.
3. If you see "Invalid input", check for letters that are not Roman numeral letters.

Good to know

• The seven letters are I (1), V (5), X (10), L (50), C (100), D (500) and M (1000).
• A smaller letter before a larger one is subtracted, so IV is 4 and IX is 9. A smaller letter after is added, so VI is 6.
• The standard system has no zero and does not go above 3999 without special marks.

Frequently asked questions

How do I write 2026 in Roman numerals?

It is MMXXVI: MM is 2000, XX is 20 and VI is 6.

Can I type lowercase letters?

Yes. Lowercase Roman numerals are accepted.

Why does the tool stop at 3999?

Writing larger numbers needs extra symbols that are not part of the basic system.