Free Number Conversion Tool

Roman Numeral Converter

Convert whole numbers into Roman numerals or translate Roman numerals back into numbers with instant and accurate results.

Instant conversion Format validation Mobile friendly

Enter a number

Enter a whole number between 1 and 3999.

Result

Your result will appear here

Enter a value and select Convert to see the answer.

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What Is a Roman Numeral Converter?

A Roman numeral converter translates regular whole numbers into the numeral system used in ancient Rome. It can also perform the reverse calculation by converting Roman numeral symbols into modern numbers.

Instead of manually checking each symbol and subtraction rule, you can enter a value into the tool and receive a properly formatted result immediately. This is helpful for dates, clocks, book chapters, movie titles, historical references and educational work.

Two-way conversion Convert numbers to Roman numerals and Roman numerals back to numbers.

Strict validation Incorrect formats such as IIII or VX are detected before a result is displayed.

Easy result copying Copy the completed conversion with one click for use in documents or assignments.

Roman Numeral Values

Roman numerals are created using seven main letters. Larger numbers are formed by combining these symbols.

I 1

V 5

X 10

L 50

C 100

D 500

M 1000

IV 4

Simple Process

How the Roman Numeral Converter Works

Complete a conversion in three straightforward steps without calculating individual symbols manually.

Select a Direction

Choose whether you want to convert a modern number into Roman numerals or a Roman numeral into a number.

Enter Your Value

Type a whole number from 1 to 3999 or enter a standard Roman numeral using the accepted symbols.

View the Result

Select the convert button to validate the input and display the accurate converted value instantly.

Numeral Rules

Important Roman Numeral Rules

Understanding these basic rules makes Roman numeral conversion easier and prevents common formatting mistakes.

Addition Rules

When a smaller or equal symbol follows a larger symbol, its value is added.
VIII equals 5 + 1 + 1 + 1, giving a total of 8.
LX equals 50 + 10, giving a total of 60.
Symbols I, X, C and M may generally be repeated up to three times.

Subtraction Rules

A smaller symbol before a larger symbol is subtracted from the larger value.
IV represents 5 minus 1 and therefore equals 4.
XC represents 100 minus 10 and therefore equals 90.
Standard subtraction pairs include IV, IX, XL, XC, CD and CM.

Conversion Examples

Common Numbers in Roman Numerals

Use these examples as a quick reference for common conversions and numeral patterns.

Number	Roman Numeral	Calculation
4	IV	5 − 1
9	IX	10 − 1
14	XIV	10 + 4
49	XLIX	40 + 9
90	XC	100 − 10
500	D	500
944	CMXLIV	900 + 40 + 4
1999	MCMXCIX	1000 + 900 + 90 + 9
2026	MMXXVI	2000 + 20 + 6
3999	MMMCMXCIX	3000 + 900 + 90 + 9

Helpful Answers

Roman Numeral Converter FAQs

Find answers to frequently asked questions about Roman numeral symbols, limits and formatting.

What is the Roman numeral for 2026?

The Roman numeral for 2026 is MMXXVI. It combines MM for 2000, XX for 20 and VI for 6.

What is the largest number this converter supports?

This converter supports standard Roman numerals from 1 to 3999. The Roman numeral for 3999 is MMMCMXCIX.

Is there a Roman numeral for zero?

Traditional Roman numerals do not include a standard symbol for zero. This is why the converter begins at the number 1.

Does the converter accept lowercase Roman numerals?

Yes. Lowercase input is automatically changed to uppercase before the Roman numeral is validated and converted.

Why is IIII usually written as IV?

Standard Roman numeral notation uses IV for 4. The I before V means that 1 is subtracted from 5. Some clock faces use IIII as a stylistic tradition, but IV is the standard mathematical form.

Can I use spaces in a Roman numeral?

The converter removes spaces automatically. However, Roman numerals are normally written without spaces, such as MCMXCIX rather than M CM XC IX.

What Roman numeral symbols are allowed?

The seven standard symbols are I, V, X, L, C, D and M. The tool rejects unsupported letters and invalid combinations.

Convert Roman Numerals in Seconds

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