What are Roman numerals?

Roman numerals are a numeral system used in ancient Rome, based on combinations of letters from the Latin alphabet: I, V, X, L, C, D, and M.

How do Roman numerals work?

Roman numerals use a combination of letters to represent values. The order and placement of these letters determine the final number.

What is the largest number that can be written in Roman numerals?

The largest standard Roman numeral is 3999, written as MMMCMXCIX. Larger numbers require non-standard notation.

Are Roman numerals still used today?

Yes! Roman numerals are used in book chapters, movie release years, clock faces, and even event names like the Olympic Games.

Can I convert decimal numbers to Roman numerals?

No, Roman numerals do not support decimal or fractional values. They only represent whole numbers.

Roman Numerals Converter

Convert numbers to Roman numerals and vice versa with ease. Understand the rules and history behind Roman numerals.

Roman Numerals Converter

Enter Number (1-3999)

Roman Numeral Rules

Symbol	Value	Usage Example
I	1	III = 3
V	5	VI = 6
X	10	XV = 15
L	50	LX = 60
C	100	CC = 200
D	500	DC = 600
M	1000	MM = 2000

Combination	Value	Rule
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

• Symbols are written left to right, largest to smallest

• A symbol can be repeated up to three times (III = 3, XXX = 30)

• Only one subtraction can be made per numeral (IV = 4, not IIII)

• Only powers of ten (I, X, C) can be used for subtraction

Common Numbers

Famous Years

Special Numbers

Easily Convert Roman Numerals and Numbers

Accurately convert numbers to Roman numerals and Roman numerals to numbers with an intuitive and educational tool.

Accurate Conversions

Convert numbers to Roman numerals and vice versa with 100% accuracy, following proper numeral rules.

Two-Way Conversion

Easily switch between converting numbers to Roman numerals and Roman numerals to numbers.

Copy Results Instantly

Quickly copy the converted Roman numeral or number to your clipboard with one click.

Roman Numeral Rules

Understand the logic behind Roman numerals with built-in guidelines and formatting rules.

Historical References

Explore famous historical years in Roman numerals, such as 1776 (MDCCLXXVI) and 2000 (MM).

How to Use the Roman Numerals Converter

Step 1

Enter a number (1-3999) or a valid Roman numeral.

Step 2

Choose conversion mode: Number to Roman or Roman to Number.

Step 3

View the result instantly with a step-by-step breakdown.

Step 4

Learn Roman numeral rules and formatting guidelines.

Step 5

Check common conversions and famous historical years.

Frequently Asked Questions

More Math Tools

Number Generator

Generate prime numbers, Fibonacci sequences, and Pi digits.

Binary Zero Counter

Convert numbers to binary and count zero occurrences.

Scientific Notation Converter

Convert numbers to and from scientific notation easily.

Binary Operations

Perform bitwise and arithmetic operations on binary numbers easily.

Decimal Converter

Convert decimal numbers to binary, hexadecimal, octal, and BCD formats.

Hex Converter

Convert hexadecimal values to number systems and color models easily.