Number to Roman Numeral Converter

Convert numbers to Roman numerals with this free online calculator. Instantly convert any number between 1 and 3999 to Roman numerals with step-by-step explanation.

Convert Numbers to Roman Numerals

Roman Numeral Table

M1000

CM900

D500

CD400

C100

XC90

L50

XL40

X10

IX9

IV4

Common Number Conversions

Roman Numeral Reference Guide

Symbol	Value	Usage	Subtractive Rules
I	1	Can be repeated (III = 3)	Before V and X
V	5	Never repeated	No subtractive pairs
X	10	Can be repeated (XXX = 30)	Before L and C
L	50	Never repeated	No subtractive pairs
C	100	Can be repeated (CCC = 300)	Before D and M
D	500	Never repeated	No subtractive pairs
M	1000	Can be repeated (MMM = 3000)	No subtractive pairs

Common Combinations

IV = 4

I before V

IX = 9

I before X

XL = 40

X before L

XC = 90

X before C

CD = 400

C before D

CM = 900

C before M

Key Rules

1. Only use subtractive notation with I, X, and C

2. Never repeat V, L, or D

3. Can repeat I, X, C, and M up to three times

About Number to Roman Numeral Conversion

Converting numbers to Roman numerals involves breaking down the number into its place values and using the appropriate Roman numeral symbols. The system uses seven basic symbols: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000).

Key Points to Remember:

Roman numerals can represent numbers from 1 to 3999
Larger numbers required special notation not commonly used today
The system doesn't have a zero
Numbers are written from left to right, largest to smallest

About this Calculator