Roman Numeral Converter
Runs locally in your browserConvert numbers and Roman numerals
Conversion direction
Input
Output
Enter a value to see the result.
Enter a value to see the result.
About Roman numerals
Roman numerals combine I, V, X, L, C, D and M. Canonical subtractive forms include IV, IX, XL, XC, CD and CM. For example, 944 is CMXLIV.
How to use
Choose a direction and enter a value. Conversion runs as you type. Swap reverses the direction using the result; Copy places the result on your clipboard. Examples load valid values.
Limits and privacy
Only integers 1–3999 are supported. Lowercase Roman input is accepted; IIII, VX and IC are rejected. Empty input remains empty. Processing stays in your browser; input is not saved or sent.
