Roman
Numeral
Converter

Convert between decimal numbers and Roman numerals. Supports values from 1 to 3,999 with step-by-step conversion breakdowns.

Decimal to Roman

Roman to Decimal

Reference Table

DecimalRoman
1I
4IV
5V
9IX
10X
40XL
50L
90XC
100C
400CD
500D
900CM
1000M

Learn more

MCMXCIV is 1994 — but how does the subtraction rule actually work, and why does it stop at 3,999?

Roman Numeral Converter | ToolsCanvas