Math • Bi-Directional Converter

Roman Numeral Converter

This simple Roman Numeral Converter can be used at any time to convert numbers to Roman Numeral. If you need to make conversion from Arabic numbers to Roman Numeral, simply enter the number in the box on the left, and press the button Convert to Roman. You will get the exact representation of the number in Roman Numeral Symbols.

Number to Roman Numeral

Number

Presets:

2023 = MMXXIII

2000 (MM) + 20 (XX) + 3 (III)

Roman Numeral to Number

Roman Number

Symbols:

MMXXIII = 2023

1000 + 1000 + 10 + 10 + 1 + 1 + 1

Number to Roman Numeral Conversion Examples

Roman Numeral Symbols Reference Table

I 1

V 5

X 10

L 50

C 100

D 500

M 1,000

Subtractive Combinations:

IV = 4

IX = 9

XL = 40

XC = 90

CD = 400

CM = 900

Rules of Roman Numeral

The Roman numeral system is an ancient additive-subtractive numbering system originated in ancient Rome. It uses seven letters of the Latin alphabet to represent values from 1 to 3,999.

1. Additive Principle

When a symbol appears after a larger (or equal) symbol, its value is added. E.g., VI = 5 + 1 = 6 and XX = 10 + 10 = 20.

2. Subtractive Principle

When a smaller symbol appears before a larger symbol, its value is subtracted. E.g., IV = 5 - 1 = 4 and IX = 10 - 1 = 9.

3. Repetition Limit

A symbol may not be repeated more than 3 consecutive times. Instead of IIII, write IV; instead of XXXX, write XL.