Roman Numeral Converter
Convert between Roman numerals and Arabic numbers with this free online tool. Supports conversion for numbers from 1 to 3999. Perfect for students, historians, developers, and anyone interested in ancient numbering systems.
Traditional Roman numerals can only represent numbers from 1 to 3999.
Conversion Result
Results will appear here after conversion.
Roman Numeral Reference
| Symbol | I | V | X | L | C | D | M |
|---|---|---|---|---|---|---|---|
| Value | 1 | 5 | 10 | 50 | 100 | 500 | 1000 |
Roman Numeral Rules
- When a symbol appears after a larger or equal symbol, it's added (VI = 5 + 1 = 6)
- When a symbol appears before a larger symbol, it's subtracted (IV = 5 - 1 = 4)
- Symbols I, X, C, and M can be repeated up to three times in succession (III = 3)
- Symbols V, L, and D cannot be repeated (VV is not valid)
- Symbols can only be subtracted from the next two higher symbols:
- I can be subtracted from V and X (IV = 4, IX = 9)
- X can be subtracted from L and C (XL = 40, XC = 90)
- C can be subtracted from D and M (CD = 400, CM = 900)
Conversion History
How to Use Roman Numeral Converter
1. Choose Conversion Type
Select the conversion type using the tabs at the top: Arabic to Roman, Roman to Arabic, or Date Converter.
2. Enter Your Number or Date
Type the number or date you want to convert. For Arabic to Roman conversion, enter a number between 1 and 3999.
3. Use Random Generator
Click the Random button to generate a random number, Roman numeral, or date to test your knowledge or practice conversions.
4. View Results and Explanation
The converted result will appear instantly with a detailed explanation of the conversion steps.
Why Use Our Roman Numeral Converter?
- Instant bi-directional conversion between Roman and Arabic numerals
- Educational explanation of conversion steps
- Date conversion to Roman numerals
- Random number generator for practice and learning
- Conversion history for reference
- Completely free with no registration required