Roman Numeral Converter

Convert between Roman numerals and decimal numbers

Decimal Number (1 - 3999)

Enter a number (1-3999) to convert to Roman numerals

Roman Numeral Rules

Subtractive notation: IV (4), IX (9), XL (40), XC (90), CD (400), CM (900)

Valid range: 1 to 3999. Letters are added when a smaller or equal value follows a larger one.

Reference Table

M1000

CM900

D500

CD400

C100

XC90

L50

XL40

X10

IX9

IV4

Actions:

How to Use

What range of numbers is supported?

The tool handles numbers from 1 to 3,999 for standard Roman numerals, with extended notation for larger values.

Does it validate Roman numeral input?

Yes. Invalid Roman numeral sequences are flagged with an error message.

What is the Roman numeral for zero?

Roman numerals did not have a representation for zero. The concept of zero was developed later.