Convert numbers to Roman numerals and Roman numerals back to numbers (1 to 3999).
Cómo usar Roman Numerals
Choose whether to convert a number to Roman or a Roman numeral to a number.
Type your value.
Copy the converted result.
Preguntas frecuentes
Standard Roman numerals from 1 (I) to 3999 (MMMCMXCIX). The Romans had no zero and no standard notation above 3999.
A smaller numeral before a larger one is subtracted, so IV is 4 and IX is 9. The converter validates this, rejecting forms like IIII or VV.
Yes. Roman numerals are read case-insensitively, so mcmlxxxiv and MCMLXXXIV both give 1984.
A two-way Roman numeral converter for numbers from 1 to 3999, validating input so only well-formed numerals are accepted.
Useful for dates, clock faces, book chapters and copyright years. It runs instantly in your browser.
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