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Roman Numeral Converter
Convert Arabic numbers to Roman numerals and validate Roman numeral input from I to MMMCMXCIX.
roman numeral converterroman numeral translatornumber to roman numeralroman to number
Type in either field to convert between Arabic numbers and Roman numerals instantly.
Roman numeral reference
Core symbols| Symbol | Value |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
Quick conversions
Common examplesIV = 4
IX = 9
XLII = 42
XCIX = 99
MMXXIV = 2024
MMXXVI = 2026
How to use
How to convert numbers to Roman numerals and validate Roman numeral input
- 1 Enter a whole Arabic number from 1 to 3999 to generate the standard Roman numeral automatically.
- 2 Type a Roman numeral into the second field when you want to convert it back into an Arabic number.
- 3 Watch the tool update on every keystroke so you can test years, chapter numbers, clocks, and other common numeral patterns.
- 4 Use the symbol reference table if you need a quick reminder of the core Roman numeral values from I to M.
- 5 Check the error message if a numeral is invalid because the tool only accepts standard subtractive forms such as IV, IX, XL, and CM.
Roman numeral conversion still comes up in books, outlines, event names, movie credits, copyright years, clocks, and historical references. A converter saves time because it handles both directions: turning standard numbers into Roman forms and interpreting Roman forms back into ordinary Arabic values. That makes the tool useful for students, teachers, designers, and anyone formatting dates or labels.
Validation matters because Roman numerals follow rules rather than allowing any random sequence of letters. Certain subtractive forms are valid, while others are not, and repeated symbols have limits. By checking the format as you type, the tool helps you avoid mistakes and see whether a numeral is written in its standard modern representation.
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