4 min read
2026-01-28
The tool allows you to convert numbers between Arabic and Roman numeral systems. The supported range is from 1 to 3999.
| Roman | Arabic |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
Symbols are written from largest to smallest, left to right
The same symbol can be repeated no more than 3 times in a row
If a smaller symbol precedes a larger one, it is subtracted (IV = 4, IX = 9)
Subtraction applies only to I, X, and C
To convert to Roman: enter an Arabic number from 1 to 3999
To convert to Arabic: enter a Roman number (e.g., MCMXCIV)
The result is displayed instantly as you type
2024 → MMXXIV
1999 → MCMXCIX
3888 → MMMDCCCLXXXVIII (the longest number up to 3999)
See also: Prime Number Checker, Fraction Calculator, GCD and LCM