Roman Numerals Converter

Convert numbers to Roman numerals and back, from 1 to 3999.

Number (1–3999)

Result

How Roman numerals work

Seven letters carry values: I=1, V=5, X=10, L=50, C=100, D=500, M=1000. Symbols add up left to right, except a smaller value before a larger one subtracts (IV=4, IX=9, XL=40, CM=900). Standard notation runs from 1 (I) to 3999 (MMMCMXCIX); there is no zero. This converter rejects malformed numerals such as IIII or VX.

Free Online Tool

How to Use Examples Related Tools

How to Use Roman Numerals Converter

Choose Number → Roman or Roman → Number.
Enter a whole number from 1 to 3999, or a Roman numeral.
The converted value appears instantly.
Malformed numerals such as IIII or VX are rejected as invalid.

Examples

Year — input:

2024

Output:

MMXXIV

Subtractive form — input:

1994

Output:

MCMXCIV

Decode — input:

MMXXIV

Output:

2024

Features

Privacy Focused

All processing happens in your browser. No data is sent to servers.

Free Forever

No registration, no limits, completely free to use.