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Roman Numeral Converter
Convert between numbers and Roman numerals.
Overview
- Converts between numbers and Roman numerals, for values from 1 to 3999.
- Supports subtractive notation such as IV, IX, and XL, following the standard rules for Roman numeral notation.
- You can choose the conversion direction: "Number → Roman numeral" or "Roman numeral → Number".
Usage
- Select the conversion direction.
- Enter a number or a Roman numeral into the input field.
- Click the "Convert" button to see the result.
Example
Input
2024 (Number → Roman numeral)
Output
MMXXIV
Use Cases
- Checking the meaning of a Roman numeral used in movie credits or a book chapter number
- Checking the correct Roman numeral notation for a design or a clock face
- Verifying whether a Roman numeral follows the standard notation rules
FAQ
Why is the convertible range limited to 1–3999?
Standard Roman numeral notation has no clearly defined symbols for values of 4000 or more without using extensions like an overline.
Can a form like "IIII" be converted?
For "Roman numeral → Number", only the standard notation using subtractive forms like IV is accepted; non-standard forms like IIII result in an error.
Can 0 or negative numbers be converted?
No. Roman numerals have no symbol for zero or negative values, so only integers from 1 to 3999 are supported.
Notes
- For "Roman numeral → Number", both uppercase and lowercase input can be converted.
- This tool only supports the standard subtractive forms (IV, IX, XL, XC, CD, CM).
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