Roman Numeral Converter
Convert numbers to Roman numerals and Roman numerals back to numbers.
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Reading and writing Roman numerals
Last updated: March 30, 2026
A Roman numeral converter is useful whenever numerals like IV, IX, XL, or MMXXVI appear in real-world contexts such as events, chapter titles, and copyright dates.
Many people recognize only basic symbols up to XII, so converting larger values quickly avoids mistakes in interpretation and formatting.
Bidirectional conversion helps both reading historical/labeling formats and generating correct numerals for documents and design.
Frequently asked questions
What number range is supported?
This converter supports standard Roman numeral range from 1 to 3999.
Why are some Roman inputs invalid?
Roman numerals have strict subtractive notation rules, so forms like IIX or VX are invalid.
Where are Roman numerals used today?
Common uses include clock faces, book chapters, event editions, movie copyrights, and Super Bowls.