Range: 1 - 3,999,999
Click any Roman numeral below to convert
Roman Numeral Reference
Basic Symbols
Common Years
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Key Features
Everything you need, right at your fingertips. Simple, fast, and built for everyone.
1 to 3,999
Full support for the standard Roman numeral range.
Reference Chart
Handy chart showing values for I, V, X, L, C, D, and M.
Learning Tool
Great for students learning Roman numerals and ancient history.
How to Use This Roman Numeral Converter
Getting started is easy. Just follow these simple steps.
Choose Mode
Number to Roman, or Roman to number.
Enter Value
Type a number (1-3999) or a Roman numeral.
See Result
The converted value appears instantly.
Learn More
Use the reference chart to understand how it works.
About This Roman Numeral Converter
Roman numerals are a numeral system that originated in ancient Rome and remained the standard way of writing numbers throughout Europe well into the Late Middle Ages. They use combinations of letters from the Latin alphabet to signify values.
The basic Roman numeral symbols are I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Numbers are formed by combining these symbols and adding their values, with a subtractive notation system where a smaller symbol placed before a larger one means subtraction (e.g., IV = 4, IX = 9, XL = 40).
Roman numerals are still used today in various contexts: clock faces, book chapter numbering, movie and game sequel numbering (e.g., Rocky IV, Final Fantasy VII), formal documents for dates, monarch and pope names (e.g., Queen Elizabeth II), and building cornerstones.
A Roman numeral converter lets you quickly convert between Arabic numbers and Roman numerals. It is useful for understanding dates on old buildings, deciphering movie sequel numbers, or just learning about this ancient number system that is still with us today.
Frequently Asked Questions
What are Roman numerals?
They write numbers with the letters I, V, X, L, C, D, and M. A smaller letter before a larger one subtracts, so IV is 4 and IX is 9.
How do I convert a number?
Type a number from 1 to 3999, or paste a Roman numeral. The other form appears immediately.
Which numbers are supported?
Standard Roman numerals from 1 through 3999, including IV, IX, XL, XC, CD, and CM.